query: where do most of the world tornadoes occur

pos: Tornado climatology Tornado climatology Tornadoes have been recorded on all continents except Antarctica and are most common in the middle latitudes where conditions are often favorable for convective storm development. The United States has the most tornadoes of any country, as well as the strongest and most violent tornadoes. A large portion of these tornadoes form in an area of the central United States popularly known as Tornado Alley. Other areas of the world that have frequent tornadoes include significant portions of Europe, South Africa, Philippines, Bangladesh, parts of Argentina, Uruguay, and southern and southeast Brazil, northern Mexico, New Zealand, and far

pos: Tornadoes in New England Tornadoes in New England Tornadoes are fairly uncommon in the US region of New England. Fewer tornadoes are recorded here than anywhere else east of the Rocky Mountains. However, these deadly and destructive storms do occur; on average, about eight tornadoes are reported in the region each year. Almost 200 people have been killed by these storms in recorded history, and two of the ten most destructive tornadoes in US history occurred in this region. Tornadoes are a violent weather phenomenon that occur most often in the United States, to the east of the Rocky Mountains. However, they most often

pos: Tornadoes of 2018 a dry storage facility was destroyed. This tornado was the strongest to occur in the state of Washington since 1986. Tornadoes do occasionally occur in the Pacific Northwest, though they are usually weak, and strong tornadoes such as this one are very uncommon for the region. Tornadoes of 2018 This page documents notable tornadoes and tornado outbreaks worldwide in 2018. Strong and destructive tornadoes form most frequently in the United States, Brazil, Bangladesh and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat

pos: Tornadoes of 2010 (see Tornadoes of 2011). Tornadoes of 2010 This page documents the tornadoes and tornado outbreaks of 2010. The majority of tornadoes form in the U.S., but they can occur almost anywhere under the right conditions. A lesser number occur outside the U.S., most notably in parts of neighboring southern Canada during the Northern Hemisphere's summer season, but are also known in South America, Europe, Asia, and Australia. There were 1,282 tornadoes confirmed in the United States in 2010, with 45 confirmed fatalities. Elsewhere in the world, 11 people were killed in tornadoes: six in Argentina, three in the Bahamas and

pos: Tornadoes of 2010 Tornadoes of 2010 This page documents the tornadoes and tornado outbreaks of 2010. The majority of tornadoes form in the U.S., but they can occur almost anywhere under the right conditions. A lesser number occur outside the U.S., most notably in parts of neighboring southern Canada during the Northern Hemisphere's summer season, but are also known in South America, Europe, Asia, and Australia. There were 1,282 tornadoes confirmed in the United States in 2010, with 45 confirmed fatalities. Elsewhere in the world, 11 people were killed in tornadoes: six in Argentina, three in the Bahamas and one each in Bangladesh

pos: Tornado climatology as tornadoes, including violent tornadoes and major outbreaks, can and do occur anywhere at any time of year if favorable conditions develop. Major tornado outbreaks have occurred in every month of the year. July is the peak month in Austria, Finland, and Germany. On average, there are around 294 tornadoes throughout the United States during the month of May, and as many as 543 tornadoes have been reported in the month of May alone (in 2003). The months with the fewest tornadoes are usually December and January, although major tornado outbreaks can and sometimes do occur even in those months.

pos: Tornadoes of 2008 the region, and tornadoes and wind damage developed. At least three tornadoes have been reported, with the most serious damage taking place near Liberty, Illinois where roofs were thrown off houses. The strongest tornadoes were rated as a high-end EF1, and eight tornadoes were confirmed. Tornadoes of 2008 This page documents notable tornadoes and tornado outbreaks worldwide in 2008. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at

pos: Tornadoes of 2017 considerable damage due to an EF1 tornado, where hangars were damaged at a small airport, a batting cage awning was blown down, homes and businesses sustained roof and window damage, many trees and power lines were downed, and a pavilion was destroyed at a local sports complex. No injuries or fatalities occurred as a result of this outbreak. Tornadoes of 2017 This page documents notable tornadoes and tornado outbreaks worldwide in 2017. Strong and destructive tornadoes form most frequently in the United States, Brazil, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also

pos: Tornado myths deadly in the 2013 El Reno tornado in which a 2.6 mile wide tornado shifted from an east direction to a northeast direction killing at least 4 storm chasers. It is often thought that tornadoes only occur in North America. The majority of tornadoes do occur in the United States; however, tornadoes have been observed on every continent except Antarctica. Besides North America, Argentina, Europe, Australia, the United Kingdom, western Russia, Bangladesh and the Philippines also experience tornadoes on a regular basis. There are many misconceptions involving the effect of terrain features—bodies of water, mountains, valleys, and others—on tornado formation

pos: Tornadoes in the United States the United States can occur at any time, they are most common in spring and least common in winter. Because spring is a transitional period for the climate, there are more chances of cooler air meeting with warmer air, resulting in more thunderstorms. Tornadoes can also be spawned by landfalling tropical cyclones, which usually occur in late summer and autumn. In the United States, thunderstorms capable of producing tornadoes usually form when the temperature is at its highest, typically from 4:00 p.m. to 7:00 p.m. Although the period in which most tornadoes strike ("tornado season") is March through June, tornadoes

pos: Tornadoes in the United States Tornadoes in the United States Tornadoes are more common in United States than in any other country. The United States receives more than 1,200 tornadoes annually—four times the amount seen in Europe. Violent tornadoes—those rated EF4 or EF5 on the Enhanced Fujita Scale—occur more often in the United States than in any other country. Most tornadoes in the United States occur east of the Rocky Mountains. The Great Plains, the Midwest, the Mississippi Valley and the southern United States are all areas that are vulnerable to tornadoes. They are relatively rare west of the Rockies and are also less frequent

pos: Tornado climatology because of solar heating. Worldwide, most tornadoes occur in the late afternoon, between 3 pm and 7 pm local time, with a peak near 5 pm. Destructive tornadoes can occur at any time of day, as evidenced by the Gainesville Tornado of 1936 (one of the deadliest tornadoes in history) that occurred at 8:30 am local time. The United States has the most tornadoes of any country. Many of these form in an area of the central (with some definitions including Southern) United States known as Tornado Alley. This area extends into Canada, particularly the Prairie Provinces and Ontario; however,

pos: Climate of Alaska is typical, but what snow falls during the winter tends to stay throughout the season. Thunderstorms are fairly rare in most of Alaska, but do occur in the interior in the summer with some frequency and may cause wildfires. Anchorage gets a thunderstorm every few years. There has even been the rare thunderstorm in Utqiagvik on the Arctic coast. While weak tornadoes and waterspouts, while extremely rare, do sometimes occur, Alaska is considered the least tornado-prone state in the United States. La Niña events lead to drier than normal conditions, while El Niño events do not have a correlation towards

pos: Tornadoes of 2009 a larger squall line. A moderate risk of severe weather was issued for the afternoon of December 24 across the northern Gulf Coast. Severe activity was limited to the immediate coastal area with supercells embedded within the larger squall line, where a single EF0 tornado was reported. Tornadoes of 2009 In 2009, tornadic activity was generally near average. Each year, tornadoes and tornado outbreaks occur worldwide primarily under conductive conditions, though a majority of tornadoes form in the United States. Tornadoes also occur to a less frequent extent in Europe, Asia, and Australia. In the U.S., there were 1,304 reports

pos: Tornadoes of 2011 Tornadoes of 2011 This page documents the tornadoes and tornado outbreaks of 2011. Extremely destructive tornadoes form most frequently in the United States, Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also appear regularly in neighboring southern Canada during the Northern Hemisphere's summer season, and somewhat regularly in Europe, Asia, and Australia. There were 1,697 tornadoes confirmed in the United States in 2011. It was the second most active year on record, with only 2004 having more confirmed tornadoes. 2011 was an exceptionally destructive and deadly year for tornadoes; worldwide, at least

pos: Tornadoes of 2006 Tornadoes of 2006 This page documents notable tornadoes and tornado outbreaks worldwide in 2006. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, and Australia. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail. In 2006, there were 1,333 reported tornadoes in the US (of which 1,103 tornadoes were confirmed), with

pos: Tornado the United States, 80% of tornadoes are EF0 and EF1 (T0 through T3) tornadoes. The rate of occurrence drops off quickly with increasing strength—less than 1% are violent tornadoes (EF4, T8 or stronger). Outside Tornado Alley, and North America in general, violent tornadoes are extremely rare. This is apparently mostly due to the lesser number of tornadoes overall, as research shows that tornado intensity distributions are fairly similar worldwide. A few significant tornadoes occur annually in Europe, Asia, southern Africa, and southeastern South America, respectively. The United States has the most tornadoes of any country, nearly four times more than

pos: Tornadoes of 2015 metroplex since the Dallas tornado of 1957. The parent storm system went on to produce several other tornadoes across the Southern United States throughout the next two days, including the second tornado to cause EF2 damage near Marianna, Arkansas within a six-day period. Overall, the storm system produced 32 tornadoes, along with significant snowfall and flooding. Tornadoes of 2015 This page documents notable tornadoes and tornado outbreaks worldwide in 2015. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally

pos: Tornadoes of 2011 Another tornado was reported in Taylors Lakes. The storms and tornadoes were accompanied with extremely heavy rainfall, flash flooding, high winds and tennis ball-sized hail. Tornadoes of 2011 This page documents the tornadoes and tornado outbreaks of 2011. Extremely destructive tornadoes form most frequently in the United States, Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also appear regularly in neighboring southern Canada during the Northern Hemisphere's summer season, and somewhat regularly in Europe, Asia, and Australia. There were 1,697 tornadoes confirmed in the United States in 2011. It was the second

pos: Tornadoes of 2018 Tornadoes of 2018 This page documents notable tornadoes and tornado outbreaks worldwide in 2018. Strong and destructive tornadoes form most frequently in the United States, Brazil, Bangladesh and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, and Australia. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail. There have been 1,149 preliminary reports of tornadoes in the United States in 2018, of which

pos: Tornadoes of 2017 Tornadoes of 2017 This page documents notable tornadoes and tornado outbreaks worldwide in 2017. Strong and destructive tornadoes form most frequently in the United States, Brazil, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, and Australia. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail. There were 1,522 reports of tornadoes in the United States in 2017, of which 1,418 were

pos: Tornadoes of 2003 Tornadoes of 2003 This page documents notable tornadoes and tornado outbreaks worldwide in 2003. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, and Australia. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail. There were 1,395 tornadoes reported in the United States in 2003, of which 1,374 were confirmed. 2003

pos: Tornadoes of 2016 minor damage to homes, trees, grain bins, and outbuildings. In Nebraska, an EF1 tornado near the town of Funk snapped power poles, and damaged irrigation pivots and trees. No injuries or fatalities occurred as a result of these tornadoes. Tornadoes of 2016 This page documents notable tornadoes and tornado outbreaks worldwide in 2016. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year

pos: Tornadoes of 2016 Tornadoes of 2016 This page documents notable tornadoes and tornado outbreaks worldwide in 2016. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, and Australia. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail. There were 1,059 tornadoes reported in the United States in 2016, of which 976 were confirmed.

pos: Tornadoes of 2015 Tornadoes of 2015 This page documents notable tornadoes and tornado outbreaks worldwide in 2015. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, and Australia. Tornadic events are often accompanied with other forms of severe weather including strong thunderstorms, winds and hail. There were 1,265 tornadoes reported in the United States in 2015 according to the Storm Prediction Center

pos: Tornadoes of 2008 Tornadoes of 2008 This page documents notable tornadoes and tornado outbreaks worldwide in 2008. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in southern Canada during the Northern Hemisphere's summer and somewhat regularly at other times of the year across Europe, Asia, and Australia. Tornadic events are often accompanied with other forms of severe weather, including strong thunderstorms, strong winds, and hail. There were 1,692 tornadoes confirmed in the United States in 2008, with 126 confirmed fatalities. This made

pos: Tornadoes of 2014 Tornadoes of 2014 This page documents the tornadoes and tornado outbreaks of 2014. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also appear regularly in neighboring southern Canada during the Northern Hemisphere's summer season, and somewhat regularly in Europe, Asia, and Australia. There were at least 928 tornadoes confirmed in the United States in 2014. 54 fatalities have been confirmed worldwide in 2014: 47 in the United States, three in Brazil and two each in Australia and Russia. Early 2014 featured

pos: Tornadoes of 2013 Tornadoes of 2013 This page documents the tornadoes and tornado outbreaks of 2013. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also appear regularly in neighboring southern Canada during the Northern Hemisphere's summer season, and somewhat regularly in Europe, Asia, and Australia. There were at least 903 tornadoes confirmed in the United States in 2013. 115 fatalities have been confirmed worldwide in 2013: 55 in the United States, 31 in Bangladesh, 24 in China, three in Turkey and two in Brazil.

pos: Disaster area mixtures of air that come from the base of a thunderstorm, being the most violent of storms. Tornadoes are usually hard to see unless they form a condensations funnel made from:- dust, water droplets and debris. Tornadoes take place in several parts of the world, such as Australia, Europe, Africa but mostly occur in the United States, Argentina, and Bangladesh. Hurricanes, cyclones, tropical storms and typhoons can be referred to as the same. They combine low pressure and strong winds that rotate counter clockwise in the northern hemisphere and clockwise in the southern hemisphere. Tropical cyclones have a low pressure

pos: Tornadoes of 2006 tornado was reported early on December 30 in Louisiana. Several tornadoes occurred across southern and eastern England associated with supercells and quasi-linear structures. A tornado struck County Armagh, Northern Ireland, causing some minor structural damage. This was followed by one of the worst New Year's Eve storms in many years. No one was injured in the tornado. Tornadoes of 2006 This page documents notable tornadoes and tornado outbreaks worldwide in 2006. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally

pos: Cyclone (the mesoscale of meteorology), within a convective storm. Air rises and rotates around a vertical axis, usually in the same direction as low-pressure systems in both northern and southern hemisphere. They are most often cyclonic, that is, associated with a localized low-pressure region within a supercell. Such storms can feature strong surface winds and severe hail. Mesocyclones often occur together with updrafts in supercells, where tornadoes may form. About 1,700 mesocyclones form annually across the United States, but only half produce tornadoes. A tornado is a violently rotating column of air that is in contact with both the surface of

pos: Tornadoes of 2009 Tornadoes of 2009 In 2009, tornadic activity was generally near average. Each year, tornadoes and tornado outbreaks occur worldwide primarily under conductive conditions, though a majority of tornadoes form in the United States. Tornadoes also occur to a less frequent extent in Europe, Asia, and Australia. In the U.S., there were 1,304 reports of tornadoes received by the Storm Prediction Center , and 1,159 tornadoes were confirmed to have taken place. Worldwide, 45 fatalities were caused by tornadoes, with 22 in the U.S., 15 in India, four in Canada, two in Greece and one each in Serbia and Russia. Tornadic

pos: Tornadoes of 2003 formed. 400 houses, dozens of cars and 1000 trees were damaged or destroyed in this tornado (which lasted for 25 minutes and swept three neighborhoods, making it the longest lived tornado in the Southern Hemisphere). It was filmed by television cameras and by many people on the ground. The tornado caused 5 killed and 90 wounded. Tornadoes of 2003 This page documents notable tornadoes and tornado outbreaks worldwide in 2003. Strong and destructive tornadoes form most frequently in the United States, Bangladesh, and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also develop occasionally in

pos: Tornado Alley Central United States, between the Rocky Mountains and Appalachian Mountains. Texas reports the most tornadoes of any state due to its large size, in addition to its proximity to Tornado Alley. Kansas and Oklahoma ranked first and second respectively in the number of tornadoes per area, per data collected through 2007, however in 2013 statistics from the National Climatic Data Center show Florida ranked first. Although Florida reports a high number and density of tornado occurrences, tornadoes there rarely reach the strength of those that sometimes occur in the southern plains. Regionally, the frequency of tornadoes in the United States

pos: Tornadoes in the United States in the northeastern states. Tornado Alley is a colloquial term for an area particularly prone to tornadoes. There is no officially defined 'Tornado Alley' – at its broadest this area stretches from northern Texas to Canada with its core centered on Oklahoma, Kansas and northern Texas. Another highly significant region – colloquially known as Dixie Alley – is the southern United States and particularly the northern and central parts of Alabama and Mississippi. Florida is one of the most tornado-prone states. However, Florida tornadoes only rarely approach the strength of those that occur elsewhere. Although favorable conditions for tornadoes in

pos: Pine Lake tornado 16 tornadoes occur in Alberta every year, and an average of 41 tornadoes occur each year in the Prairie Provinces. The highest death toll due to a single tornado in Alberta occurred on July 31, 1987, colloquially referred to as Black Friday. Canada ranks second in the world for tornado occurrences after the United States. Pine Lake tornado The Pine Lake tornado was a deadly tornado in central Alberta which occurred on Friday, July 14, 2000 and struck a campground and a trailer park. Twelve people were killed, making it the first deadly tornado in Canada since 1987, when an

pos: Tornado also occur across northeastern Mexico. The United States averages about 1,200 tornadoes per year, followed by Canada, averaging 62 reported per year. NOAA's has a higher average 100 per year in Canada. The Netherlands has the highest average number of recorded tornadoes per area of any country (more than 20, or 0.0013 per sq mi (0.00048 per km), annually), followed by the UK (around 33, or 0.00035 per sq mi (0.00013 per km), per year), although those are of lower intensity, briefer and cause minor damage. Tornadoes kill an average of 179 people per year in Bangladesh, the most in

pos: Thunderstorm are most frequent in spring and summer, although they can occur along or ahead of cold fronts at any time of year. They may also occur within a cooler air mass following the passage of a cold front over a relatively warmer body of water. Thunderstorms are rare in polar regions because of cold surface temperatures. Some of the most powerful thunderstorms over the United States occur in the Midwest and the Southern states. These storms can produce large hail and powerful tornadoes. Thunderstorms are relatively uncommon along much of the West Coast of the United States, but they occur

pos: Texas experiences the most tornadoes in the United States, an average of 139 a year. These strike most frequently in North Texas and the Panhandle. Tornadoes in Texas generally occur in the months of April, May, and June. Some of the most destructive hurricanes in U.S. history have impacted Texas. A hurricane in 1875 killed about 400 people in Indianola, followed by another hurricane in 1886 that destroyed the town. These events allowed Galveston to take over as the chief port city. The 1900 Galveston hurricane subsequently devastated that city, killing about 8,000 people or possibly as many as 12,000. This

pos: Dixie Alley Plains states (excluding Texas). This is in part due to the relatively high number of strong/violent long tracked tornadoes and higher population density of this region, as well as the Southern United States having the highest percentage of manufactured homes in the US, where 63% of the overall tornado-related fatalities occur. According to the National Climatic Data Center, for the period January 1, 1950 – October 31, 2006, Alabama and Kansas received the largest amount of F5 tornadoes. Complicating matters is that tornadoes are rarely visible in this area, as they are more likely to be rain-wrapped, embedded in shafts

pos: Tornado climatology eastern Asia. The United States averaged 1,274 tornadoes per year in the last decade while Canada reports nearly 100 annually (largely in the southern regions). However, the UK has most tornadoes per area per year, 0.14 per 1000 km², although these tornadoes are generally weak, and many other European countries have a similar number of tornadoes per area. The severity of tornadoes is commonly measured by the Enhanced Fujita Scale, which scales tornado intensity from EF0 to EF5 by wind speed and the amount of damage they do to human environments. These judgments are made after the tornado has dissipated

neg: Supercell supercell thunderstorms each year with the inclusion of isolated tornadoes. On most occasions these tornadoes occur in open farmlands and rarely cause damage to property, as such many of the tornadoes which do occur in South Africa are not reported. The majority of supercells develop in the central, northern, and north eastern parts of the country. The Free State, Gauteng, and Kwazulu Natal are typically the provinces where these storms are most commonly experienced, though supercell activity is not limited to these provinces. On occasion, hail reaches sizes in excess of golf balls, and tornadoes, though rare, also occur. On

neg: Tornado the world. Reasons for this include the region's high population density, poor construction quality, and lack of tornado safety knowledge. Other areas of the world that have frequent tornadoes include South Africa, the La Plata Basin area, portions of Europe, Australia and New Zealand, and far eastern Asia. Tornadoes are most common in spring and least common in winter, but tornadoes can occur any time of year that favorable conditions occur. Spring and fall experience peaks of activity as those are the seasons when stronger winds, wind shear, and atmospheric instability are present. Tornadoes are focused in the right front

neg: Anticyclonic storm system. Anticyclonic tornadoes often occur; while tornadoes' vortices are low-pressure regions, this occurs because tornadoes occur on a small enough scale such that the Coriolis effect is negligible. Anticyclonic storm An anticyclonic storm is a weather storm where winds around the storm flow in the direction opposite to that of the flow about a region of low pressure. In the Northern Hemisphere, anticyclonic storms involve clockwise wind flow; in the Southern Hemisphere, they involve counterclockwise wind flow. Anticyclonic storms usually form around high-pressure systems. These do not "contradict" the Coriolis effect; it predicts such anticyclonic flow about high-pressure regions. Anticyclonic

neg: Tornadoes in New England Locks tornado by contrast had a relatively small damage path, but it caused significant damage to parts of Bradley International Airport, including the New England Air Museum, where dozens of expensive and historic aircraft were damaged or destroyed, leading to the large damage figure. Tornadoes in New England Tornadoes are fairly uncommon in the US region of New England. Fewer tornadoes are recorded here than anywhere else east of the Rocky Mountains. However, these deadly and destructive storms do occur; on average, about eight tornadoes are reported in the region each year. Almost 200 people have been killed by these

neg: Tornado climatology are typically weak, more powerful and damaging tornadoes, such as the tornado that occurred on 22 May 2008 in Perris, California, can also occur. More tornadoes occur in Texas than in any other US state. The state which has the highest number of tornadoes per unit area is Florida, although most of the tornadoes in Florida are weak tornadoes of EF0 or EF1 intensity. A number of Florida's tornadoes occur along the edge of hurricanes that strike the state. The state with the highest number of strong tornadoes per unit area is Oklahoma. The neighboring state of Kansas is also

neg: Wall cloud the wall cloud. Large tornadoes tend to come from larger, lower wall clouds closer to the back of the rain curtain (providing less visual warning time to those in the path of an organized storm). Although it is rotating wall clouds that contain most strong tornadoes, many rotating wall clouds do not produce tornadoes. Absent the co-position of a low-level boundary with an updraft, tornadoes very rarely occur without a sufficiently buoyant rear flank downdraft (RFD), which usually manifests itself visually as a drying out of clouds, called a clear slot or notch. The RFD initiates the tornado, occludes around

neg: Satellite tornado Satellite tornado A satellite tornado is a tornado that rotates around a larger, primary tornado and interacts with the same mesocyclone. Satellite tornadoes occur apart from the primary tornado and are not considered subvortices; the primary tornado and satellite tornadoes are considered to be separate tornadoes. The cause of satellite tornadoes is not known. Such tornadoes are more often anticyclonic than are typical tornadoes and these pairs may be referred to as tornado couplets. Satellite tornadoes most commonly form in association with very large and intense tornadoes. Satellite tornadoes are relatively uncommon. When a satellite tornado does occur there is

neg: Tornado myths that escaping in a vehicle is the safest method of avoiding a tornado, but this could increase the danger in some situations. Other myths are that tornadoes can skip houses, always travel in a predictable direction, always extend visibly from the ground to the cloud, and increase in intensity with increasing width. Finally, some people believe that tornadoes only occur in North America, do not occur in winter, are attracted to trailer park homes, or that some areas are protected from tornadoes by rivers, mountains, valleys, tall buildings or other geographical or man-made features; the truth is that tornadoes can

neg: Wyoming on February 9, 1933. The number of thunderstorm days vary across the state with the southeastern plains of the state having the most days of thunderstorm activity. Thunderstorm activity in the state is highest during the late spring and early summer. The southeastern corner of the state is the most vulnerable part of the state to tornado activity. Moving away from that point and westwards, the incidence of tornadoes drops dramatically with the west part of the state showing little vulnerability. Tornadoes, where they occur, tend to be small and brief, unlike some of those that occur a little farther

neg: Severe weather from the strong winds, due to their rapid dissipation over land. However, severe flooding can occur even far inland because of high amounts of rain from tropical cyclones and their remnants. Waterspouts are generally defined as tornadoes or non-supercell tornadoes that develop over bodies of water. Waterspouts typically do not do much damage because they occur over open water, but they are capable of traveling over land. Vegetation, weakly constructed buildings, and other infrastructure may be damaged or destroyed by waterspouts. Waterspouts do not generally last long over terrestrial environments as the friction produced easily dissipates the winds. Strong horizontal

neg: Tropical cyclones and tornadoes in Pakistan subcontinent with most in Bangladesh and eastern India. However, dust devils are common in Pakistan, particularly in the northern and central parts of the country. Tornadoes are highly uncommon in Pakistan, where they mostly occur in March and April when a Western Disturbance starts effecting the northern parts of the country. It is also speculated that cycles of tornado years may be correlated to the periods of reduced tropical cyclone activity Following is a list of tornadoes which struck the country. Tropical cyclones and tornadoes in Pakistan The tropical cyclones and tornadoes in Pakistan include the deadliest cyclone to hit

neg: Tornado quadrant of landfalling tropical cyclones, which tend to occur in the late summer and autumn. Tornadoes can also be spawned as a result of eyewall mesovortices, which persist until landfall. Tornado occurrence is highly dependent on the time of day, because of solar heating. Worldwide, most tornadoes occur in the late afternoon, between 3 pm and 7 pm local time, with a peak near 5 pm. Destructive tornadoes can occur at any time of day. The Gainesville Tornado of 1936, one of the deadliest tornadoes in history, occurred at 8:30 am local time. The United Kingdom has the highest incidence

neg: Tornadoes in the United States by the frequent ordinary thunderstorms that occur over the state. Hurricanes and other tropical storms can generate large numbers of tornadoes. Non-supercell tornadoes are rarely as strong as supercell-generated storms. Florida's most violent tornadoes generally occur during the winter months, when the state is most vulnerable to invasions of cold air that help generate such storms. In recent years there have been some particularly disastrous tornado events. During the night of February 22 and 23, 1998, an F3 tornado struck Kissimmee and killed 25 people. Later that night, another F3 tornado struck Seminole and Volusia Counties and killed 13 people

neg: Thunderstorm as forms of tornadoes, or more specifically, non-supercelled tornadoes that develop over large bodies of water. These spiralling columns of air frequently develop within tropical areas close to the equator, but are less common within areas of high latitude. Flash flooding is the process where a landscape, most notably an urban environment, is subjected to rapid floods. These rapid floods occur more quickly and are more localized than seasonal river flooding or areal flooding and are frequently (though not always) associated with intense rainfall. Flash flooding can frequently occur in slow-moving thunderstorms and is usually caused by the heavy liquid

neg: Severe thunderstorm watch would be replaced). A watch must not be confused with a Severe Thunderstorm Warning. A watch does not necessarily mean that severe weather is actually occurring, only that atmospheric conditions have created a significant risk for severe weather to occur. If severe weather actually does occur, a severe thunderstorm warning or tornado warning will be issued, and urgent action should be taken immediately. While a severe thunderstorm watch does not imply in its name the risk for tornadoes, the risk for tornadoes in such a scenario is not necessarily zero as severe thunderstorms can and occasionally do spawn tornadoes even

neg: Tornadoes in the United States year. The state with the most tornadoes per unit area is Florida, though most are weak tornadoes of EF0 or EF1 intensity. A number of Florida's tornadoes occur along the edge of hurricanes that strike the state. The state with the highest number of strong tornadoes per unit area is Oklahoma. States such as Oklahoma and Kansas have much lower population densities than Florida, so tornadoes may go unreported. The Midwestern states are very prone to tornado activity, as it is part of "Tornado Alley." States included in the area that are hit by tornadoes the most are Oklahoma, Kansas,

neg: Tornado climatology and the damage trail is carefully studied by weather professionals. Tornadoes are most common in spring and least common in winter. The seasonal transition during autumn and spring promotes the development of extratropical cyclones and frontal systems that support strong convective storms. Tornadoes are also common in landfalling tropical cyclones, where they are focused in the right poleward section of the cyclone. Tornadoes can also be spawned as a result of eyewall mesovortices, which persist until landfall. However, favorable conditions for tornado development can occur any time of the year. Tornado occurrence is highly dependent on the time of day,

neg: Climate of Florida lightning deaths has been slowly dropping despite a rising population, suggesting that lightning awareness programs are effective. The most likely targets of lightning strikes are construction workers and others who work outside, though 12 percent of the cases occurred indoors to people using electronic devices. Severe thunderstorms can sometimes produce hail, very strong straight line winds and tornadoes. Very heavy rainfall from thunderstorms can result in flash flooding. Thunderstorms occur most often during the summer but can occur at any time of the year. There are more tornadoes per square mile in Florida than any other state. However, these tornadoes

neg: Anticyclonic tornado surrounding air flows into the area of less dense air forming cyclonic rotation. The rotation of the thunderstorm itself is induced mostly by vertical wind shear. Various processes can produce an anticyclonic tornado. Most often they are satellite tornadoes of larger tornadoes which are directly associated with the tornadocyclone and mesocyclone. Occasionally anticyclonic tornadoes occur as an anticyclonic companion (mesoanticyclone) to a mesocyclone within a single storm. Anticyclonic tornadoes can occur as the primary tornado with a mesocyclone and under a rotating wall cloud. Also, anticyclonic supercells (with mesoanticyclone), which usually are storms that split and move to the left

neg: Emergency management in American universities winds that can reach 300 miles per hour. Although the weather channel can sometimes attempt to predict when an tornado will hit and where, sometimes they occur with little or no time for a warning to be given. Generally tornadoes occur near the trailing end of a thunderstorm and can sometimes be seen forming. It is a common misconception that tornadoes only occur in areas like Tornado Alley, however they have been observed on every continent except Antarctica. Since Tornadoes have the ability to strike quickly with no warning and cause extreme devastation American universities are learning to be aware

neg: Tornadoes of 2014 States from July 27 to July 28. On the 27th, the weather system produced a low-end EF3 tornado that struck the small community of Speedwell, Tennessee, where several homes were destroyed and numerous trees were downed. This tornado was unusual due to the fact that most strong tornadoes that occur in July are confined to the northernmost states. A few other weak tornadoes were confirmed in other areas that day as well. The system produced one additional tornado on the 28th, a damaging EF2 that ripped through the Boston suburb of Revere, Massachusetts, severely damaging numerous homes and businesses in

neg: Tornado by the winds of the parent thunderstorm, heavy rain and hail, and the darkness of night are all factors which can reduce the visibility of tornadoes. Tornadoes occurring in these conditions are especially dangerous, since only weather radar observations, or possibly the sound of an approaching tornado, serve as any warning to those in the storm's path. Most significant tornadoes form under the storm's "updraft base", which is rain-free, making them visible. Also, most tornadoes occur in the late afternoon, when the bright sun can penetrate even the thickest clouds. Night-time tornadoes are often illuminated by frequent lightning. There is

neg: Tornado climatology night of 7 September 2009, killing 11 people. The same tornado hit the nearby town of Guaraciaba, Brazil, killing 6. The neighboring towns of Veloso Santo and Santa Cecilia were seriously damaged and were declared in a state of emergency. Tornadoes do occur in South Africa. In October 2011 (i.e. in the spring), two people were killed and nearly 200 were injured after a tornado formed, near Ficksburg in the Free State; more than 1,000 shacks and houses were flattened. There is also the seasonal incidence of tornadoes in the coast of western Africa. These occur during the onset of

neg: Tornado tornado at the same time. Although this is a widely accepted theory for how most tornadoes form, live, and die, it does not explain the formation of smaller tornadoes, such as landspouts, long-lived tornadoes, or tornadoes with multiple vortices. These each have different mechanisms which influence their development—however, most tornadoes follow a pattern similar to this one. A "multiple-vortex tornado" is a type of tornado in which two or more columns of spinning air rotate about their own axis and at the same time around a common center. A multi-vortex structure can occur in almost any circulation, but is very

neg: Edmonton is the melt from of snowfall per annum. Precipitation is heaviest in the late spring, summer, and early autumn. The wettest month is July, while the driest months are February, March, October, and November. In July, the mean precipitation is . Dry spells are not uncommon and may occur at any time of the year. Extremes do occur, such as the of rainfall that fell on July 31, 1953. Summer thunderstorms can be frequent and occasionally severe enough to produce large hail, damaging winds, funnel clouds, and occasionally tornadoes. Twelve tornadoes had been recorded in Edmonton between 1890 and 1989,

neg: Tornadoes of 2012 Tornadoes of 2012 This page documents the tornadoes and tornado outbreaks of 2012. Extremely destructive tornadoes form most frequently in the U.S., Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also appear regularly in neighboring southern Canada during the Northern Hemisphere's summer season, and somewhat regularly in Europe, Asia, Argentina, and Australia. There were 939 tornadoes confirmed in the U.S. in 2012. 86 fatalities have been confirmed worldwide in 2012: one each in Poland, Japan and Italy, three in New Zealand, five in Indonesia, six in Turkey and 69 in the United

neg: Tornado records North America, held the record for the most prolific tornado outbreak for many years. Not only did it produce an exceptional number of tornadoes, but it was also an inordinately intense outbreak producing dozens of large, long-track tornadoes, including 7 F5 and 23 F4 tornadoes. More significant tornadoes occurred within 24 hours than any other week in the tornado record. Due to a secular trend in tornado reporting, the 2011 and 1974 tornado counts are not directly comparable. Most tornado outbreaks in North America occur in the spring, but there is a secondary peak of tornado activity in the fall

neg: Tornado climatology about 800 kilometers (500 miles) south of Beijing, China, killing at least 78 people and destroying buildings. Nearly 500 people were injured, 200 of them critically, the official Xinhua News Agency reported. Throughout China, an estimate 100 tornadoes may occur per with a few exceeding F4 in intensity, with activity most prevalent in eastern regions. South America has its own , composed of central and northern Argentina, southern and southeast Brazil, Uruguay, and part of Paraguay, and is considered the second highest frequency tornado region in the world. Argentina has areas with high tornadic activity, and the strongest tornadoes in

neg: Gulf Coast of the United States Louisiana, Mobile, Alabama and Pensacola, Florida. However, the central and southern Florida peninsula has a pronounced winter dry season, as at Tampa and Fort Myers, Florida. On the central and southern Texas coast, winter, early spring and mid-summer are markedly drier, and September is the wettest month on average (as at Corpus Christi and Brownsville, Texas). Tornadoes are infrequent at the coast but do occur; however, they occur more frequently in inland portions of Gulf Coast states. Over most of the Gulf Coast from Houston, Texas eastward, extreme rainfall events are a significant threat, commonly from tropical weather systems, which

neg: Tornadoes of 2012 as well over parts of the Carolinas. Several tornadoes were reported on December 25, especially across Louisiana and Mississippi. At 5:00 pm CST (2300 UTC), a tornado emergency was issued for Downtown Mobile, Alabama as a large tornado was approaching the downtown area. The tornado was later rated an EF2 on the Enhanced Fujita scale. Tornadoes of 2012 This page documents the tornadoes and tornado outbreaks of 2012. Extremely destructive tornadoes form most frequently in the U.S., Bangladesh, Brazil and Eastern India, but they can occur almost anywhere under the right conditions. Tornadoes also appear regularly in neighboring southern Canada

neg: Tornadoes in New England Most tornadoes reported in the region are "weak", rated EF0 or EF1 on the Enhanced Fujita Scale (the Fujita scale prior to 2007). Around 30% are "significant" tornadoes (rated EF2 or greater), and only 1% are violent (rated EF4 or EF5, the highest damage rating). Weak tornadoes occur in all areas of New England, but EF3 or greater tornadoes have been reported only in New England's practical "Tornado Alley" of Massachusetts, Connecticut, and southern New Hampshire. Peak tornado activity in New England occurs during the summer months of June, July and August. Tornadoes typically strike between 3 and 9 pm

neg: Tornado estimated in all of Europe, excluding waterspouts. This is mostly due to the unique geography of the continent. North America is a large continent that extends from the tropics north into arctic areas, and has no major east-west mountain range to block air flow between these two areas. In the middle latitudes, where most tornadoes of the world occur, the Rocky Mountains block moisture and buckle the atmospheric flow, forcing drier air at mid-levels of the troposphere due to downsloped winds, and causing the formation of a low pressure area downwind to the east of the mountains. Increased westerly flow

neg: Huntsville, Alabama from August to October. Droughts can occur in the summer, but usually there is enough rainfall to keep things very lush and humid. Much of Huntsville's precipitation is delivered by thunderstorms. Thunderstorms are most frequent during the spring, and the most severe storms occur during the spring and late fall. These storms can deliver large hail, damaging straight-line winds, and tornadoes. Huntsville lies in a region colloquially known as Dixie Alley, an area more prone to violent, long-track tornadoes than most other parts of the US. On April 27, 2011, the largest tornado outbreak on record, the 2011 Super Outbreak,

neg: Tornado climatology Strong and violent tornadoes (F3–F5) do occur, especially in some of the interior areas and in the south – but are not as common as in parts of the US. As in the US, tornadoes are far from evenly distributed. Europe has some small "tornado alleys" – probably because of frontal collisions as in the south and east of England, but also because Europe is partitioned by mountain ranges like the Alps. Parts of Styria (Steiermark) in Austria may be such a tornado alley, and this county has had at least three F3 tornadoes since 1900. F3 and perhaps one

neg: Pennsylvania and snowfall amounts are greater. Western areas of the state, particularly locations near Lake Erie, can receive over of snowfall annually, and the entire state receives plentiful precipitation throughout the year. The state may be subject to severe weather from spring through summer into fall. Tornadoes occur annually in the state, sometimes in large numbers, such as 30 recorded tornadoes in 2011; generally speaking, these tornadoes do not cause significant damage. Historically, as of 1600, the tribes living in Pennsylvania were the Algonquian Lenape (also Delaware), the Iroquoian Susquehannock & Petun (also Tionontati, Kentatentonga, Tobacco, Wenro) and the presumably Siouan

neg: Tornado vortex signature a strong couplet in concert with a "tornado debris signature" (TDS) (i.e. a "debris ball" on reflectivity or certain polarimetric characteristics), or through confirmation from storm spotters. When the algorithm is tripped, a TVS icon (typically a triangle representing a vortex) and pertinent information appear. Radar analysis of the velocity couplet as well as the automated TVS are very significant to issuing tornado warnings and can suggest the strength and location of possible tornadoes. Although many tornadoes, especially the stronger ones, coincide with a TVS, many weak EF0-EF1 tornadoes can and do occur without a TVS, especially if they are

neg: Squall line Squall line A squall line or quasi-linear convective system (QLCS) is a line of thunderstorms forming along or ahead of a cold front. In the early 20th century, the term was used as a synonym for cold front. It contains heavy precipitation, hail, frequent lightning, strong straight-line winds, and possibly tornadoes and waterspouts. Strong straight-line winds can occur where the squall line is in the shape of a bow echo. Tornadoes can occur along waves within a line echo wave pattern (LEWP), where mesoscale low-pressure areas are present. Some bow echoes which develop within the summer season are known as

neg: Tornadoes of 2018 a 10% hatched risk area for tornadoes. A mixed convective mode was predicted, with both bowing line segments and discrete supercell thunderstorms expected to develop in the threat area. Throughout the event, the development of isolated supcercell thunderstorms that was expected did not occur. However, a large quasi-linear convective system developed, and numerous semi-discrete supercell structures and embedded mesovortices within the larger line of severe storms produced a moderate outbreak of tornadoes. While most of these tornadoes were relatively brief, several of them were strong, resulting in major damage and fatalities. A high-end EF2 tornado near Adairville, Kentucky destroyed several

neg: Tornadoes of 2013 in Florida in June 2012. The 65 confirmed tornadoes was the third most ever recorded to occur in January. The outbreak was the largest January-tornado outbreak in Middle Tennessee, which confirmed 22 tornadoes. There were 46 tornadoes reported in the U.S. in February, of which 39 were confirmed. As a large and powerful area of low pressure moved across the northern Plains, powerful severe thunderstorms developed across a trailing cold front. These storms, located across Louisiana and Mississippi primarily, prompted many tornado warnings. Shortly after 5:00 pm CST (2300 UTC), a large and extremely dangerous tornado was confirmed southwest of

neg: Tornado hot day. If there is enough low level wind shear, the column of hot, rising air can develop a small cyclonic motion that can be seen near the ground. They are not considered tornadoes because they form during fair weather and are not associated with any clouds. However, they can, on occasion, result in major damage. Small-scale, tornado-like circulations can occur near any intense surface heat source. Those that occur near intense wildfires are called "fire whirls". They are not considered tornadoes, except in the rare case where they connect to a pyrocumulus or other cumuliform cloud above. Fire whirls

neg: Tornadogenesis a supercell. Landspouts are tornadoes that do not form from supercells and are similar in appearance and structure to fair-weather waterspouts with the exception that they form over land instead of water. They are thought to form in a manner similar to that of weaker waterspouts in that they form during the growth stage of convective clouds by the ingestion and tightening of boundary layer vorticity by the cumuliform tower's updraft. Though these are widely accepted hypotheses for how most tornadoes form, they do not explain the formation of long-lived tornadoes, or tornadoes with multiple vortices. These each have different

neg: Multiple-vortex tornado suction spots) are really substructures of many, perhaps all, tornadoes but are not always easily visible. These occur, usually, at the base of the tornado vortex where the tornado makes contact with the surface. Subvortices tend to form after vortex breakdown reaches the surface and are resultant from the ratio of cyclonically incoming and rising air motions. Multivortex structure is not unique to tornadoes, occurring in other circulations such as dust devils, but is a natural result of the physics of vortex dynamics. Multivortex tornadoes should not be confused with cyclically tornadic supercells. These systems can have the tendency to

neg: Tornado climatology of extreme weather events. It covers most of central Argentina, southern Paraguay, southeastern Brazil, and Uruguay. Bangladesh and surrounding areas of eastern India suffer from a couple tornadoes annually of similar severity to stronger tornadoes in the US. These occur with a greater recurrence interval (although over a smaller region), and tend to be under-reported due to the scarcity of media coverage of a developing country. The annual human death toll from tornadoes in Bangladesh is estimated at about 179 deaths per year, which is much greater than in the US. This is likely due to the density of population,

neg: Tornado outbreak Tornado outbreak A tornado outbreak is the occurrence of multiple tornadoes spawned by the same synoptic scale weather system. The number of tornadoes required to qualify as an outbreak typically are at least six to ten. The tornadoes usually occur within the same day, or continue into the early morning hours of the succeeding day, and within the same region. Most definitions allow for a break in tornado activity (time elapsed from the end of last tornado to the beginning of next tornado) of six hours. If tornado activity indeed resumes after such a lull, many definitions consider the event

neg: Climate of Houston Unlike Dallas, Houston is not in Tornado Alley; however, smaller tornadoes can occur during severe weather. They are most likely to be found along frontal boundaries of an air mass during the spring months. Tornadoes in Houston usually measure a weak F1 on the older Fujita scale and cause light to moderate damage to well-constructed buildings. The strongest recorded tornado in Houston history was an F4 on November 21, 1992, part of a large outbreak of tornadoes in Harris County. There are usually a few days of freezing (<) temperatures each year, though the average low in January, the coldest

neg: Tornado researchers typically distinguish "fair weather" waterspouts from tornadic waterspouts. Fair weather waterspouts are less severe but far more common, and are similar to dust devils and landspouts. They form at the bases of cumulus congestus clouds over tropical and subtropical waters. They have relatively weak winds, smooth laminar walls, and typically travel very slowly. They occur most commonly in the Florida Keys and in the northern Adriatic Sea. In contrast, tornadic waterspouts are stronger tornadoes over water. They form over water similarly to mesocyclonic tornadoes, or are stronger tornadoes which cross over water. Since they form from severe thunderstorms and

neg: Tornado climatology on 12 July 2006, the EF2 twister in the borough of Brooklyn on 8 August 2007, or the F4 twister that struck La Plata, Maryland on 28 April 2002. Tornadoes can occur west of the continental divide, but they are infrequent and usually relatively weak and short-lived. Recently, tornadoes have struck the Pacific coast town of Lincoln City, Oregon (1996), Sunnyvale, California (1998), and downtown Salt Lake City, Utah (1999 - see Salt Lake City Tornado). The California Central Valley is an area of some frequency for tornadoes, albeit of weak intensity. Though tornadoes that occur on the Western Seaboard

neg: Tornado usually are not as strong as tornadoes associated with thunderstorms. They can, however, produce significant damage. A "steam devil" is a rotating updraft between 50 and 200 meters wide that involves steam or smoke. These formations do not involve high wind speeds, only completing a few rotations per minute. Steam devils are very rare. They most often form from smoke issuing from a power plant's smokestack. Hot springs and deserts may also be suitable locations for a tighter, faster-rotating steam devil to form. The phenomenon can occur over water, when cold arctic air passes over relatively warm water. The Fujita

neg: Supercell produce copious amounts of hail, torrential rainfall, strong winds, and substantial downbursts. Supercells are one of the few types of clouds that typically spawn tornadoes within the mesocyclone, although only 30% or fewer do so. Supercells can occur anywhere in the world under the right weather conditions. The first storm to be identified as the supercell type was the Wokingham storm over England, which was studied by Keith Browning and Frank Ludlam in 1962. Browning did the initial work that was followed up by Lemon and Doswell to develop the modern conceptual model of the supercell.<ref name="Lemon/Doswell"></ref> To the extent

neg: Tornado climatology since 1950. These reports have been gathered by the National Climatic Data Center (NCDC), based in Asheville, North Carolina. A tornado can be reported more than once, such as when a storm crosses a county line and reports are made from two counties. Some people mistakenly believe that tornadoes only occur in the countryside. This is hardly the case. While it is true that the plains states are the most tornado-prone places in the nation, it should be noted that tornadoes have been reported in every U.S state, including Alaska and Hawaii. One likely reason tornadoes are so common in

neg: Tornado Alley Over the years, the location(s) of Tornado Alley have not been clearly defined. No definition of tornado alley has ever been officially designated by the National Weather Service (NWS). Thus, differences in location are the result of the different criteria used. According to the National Severe Storms Laboratory (NSSL) FAQ, "Tornado Alley" is a term used by the media as a reference to areas that have higher numbers of tornadoes. A study of 1921–1995 tornadoes concluded almost one-fourth of all significant tornadoes occur in this area. No state is entirely free of tornadoes; however, they occur more frequently in the

neg: 1978 Bossier City tornado outbreak 1978 Bossier City tornado outbreak The 1978 Bossier City tornado outbreak was an outbreak of 11 tornadoes that occurred during the early morning hours of December 3, 1978, in Louisiana and Arkansas. The outbreak produced several significant (F2–F5) tornadoes, several of which were long tracked. The first and most destructive of the tornadoes was a violent F4 tornado touched down on the eastern bank of the Red River in Bossier City, Louisiana, at approximately 1:50 a.m. CST. The tornado produced a path up to wide and nearly long through the heart of Bossier City. The only two deaths to occur

neg: March 2009 tornado outbreak sequence the central and southern Great Plains and was the main area where thunderstorm development would occur. Although moisture was limited, strong wind shear created favorable conditions for supercells to develop and rotate. As a result, the supercells had the potential to produce tornadoes. A moderate risk of severe weather was issued for portions of central and eastern Kansas and northern Oklahoma. During the day, a fast-moving supercell produced several tornadoes in eastern Nebraska and across the state line into the west central portion of Iowa. Five tornadoes occurred in eastern Nebraska, with eight people injured in Eagle. In Iowa, an

neg: Climate of South Carolina to strike South Carolina in recent times are Hurricane Hazel (1954) and Hurricane Hugo (1989), which were of category 4 strength. For weaker systems, rainfall and spin-up tornadoes in the outer bands are the main impacts to the state. The wettest known tropical cyclone to impact South Carolina was a tropical depression named Jerry in 1995 which stalled nearby and had previously been a tropical storm across Florida. South Carolina averages around 64 days of [[thunderstorm]] activity per year. Most thunderstorms occur during the summer. South Carolina is vulnerable to [[tornadoes]]. Some notable tornadoes have struck South Carolina and the

neg: Tornadoes of 2010 generally minimal. More severe weather was expected on May 19, particularly over Oklahoma and North Texas. A high risk of severe weather and a PDS tornado watch was issued for central Oklahoma as a result. Numerous tornadoes were reported across the area, although only a few resulted in significant damage as a forecasted major tornado outbreak did not occur. The severe weather shifted north as a new low pressure system tracked across the northern Plains states on May 22. Isolated tornadoes were reported across portions of central South Dakota that afternoon. The most intense supercell produced a long-lived wedge tornado

neg: Tornadoes of 2011 more severe weather ahead of a dry line across eastern Nebraska, where tornadoes were reported northeast of Omaha. Later, a cluster of supercells began producing tornadoes in south-central Iowa, where a tornado was reported in Greenfield, Iowa, and at least 2 tornadoes were reported near Winterset, Iowa. Several funnel clouds were reported in Des Moines, where there was a possible touchdown. These funnels were associated with the storm that produced the first tornado to hit Greenfield and Winterset. On March 23, more tornadoes and severe weather developed with the most significant tornadoes touching down in East Tennessee where significant damage

neg: Bangladesh never recorded an air temperature below , with a record low of in the north west city of Dinajpur on 3 February 1905. A warm and humid monsoon season lasts from June to October and supplies most of the country's rainfall. Natural calamities, such as floods, tropical cyclones, tornadoes, and tidal bores occur almost every year, combined with the effects of deforestation, soil degradation and erosion. The cyclones of 1970 and 1991 were particularly devastating, the latter killing some 140,000 people. In September 1998, Bangladesh saw the most severe flooding in modern world history. As the Brahmaputra, the Ganges and

neg: Austin, Texas Typical of Central Texas, severe weather in Austin is a threat that can strike during any season. However, it is most common during the spring. According to most classifications, Austin lies within the extreme southern periphery of Tornado Alley, although many sources place Austin outside of Tornado Alley altogether. Consequently, tornadoes strike Austin less frequently than areas farther to the north. However, severe weather and/or supercell thunderstorms can occur multiple times per year, bringing damaging winds, lightning, heavy rain, and occasional flash flooding to the city. The deadliest storm to ever strike city limits was the twin tornadoes storm of

neg: Tornado and longevity remains a problem, as do details affecting characteristics of a tornado during its life cycle and tornadolysis. Other rich areas of research are tornadoes associated with mesovortices within linear thunderstorm structures and within tropical cyclones. Scientists still do not know the exact mechanisms by which most tornadoes form, and occasional tornadoes still strike without a tornado warning being issued. Analysis of observations including both stationary and mobile (surface and aerial) in-situ and remote sensing (passive and active) instruments generates new ideas and refines existing notions. Numerical modeling also provides new insights as observations and new discoveries are integrated