BLITZER: Breaking weather news tonight. Millions of people in the eastern part of the United States are under severe thunderstorm watches as millions more face severe flooding in the Midwest. Our meteorologist Allison Chinchar is monitoring all of this from our severe weather center -- Allison.</s>ALLISON CHINCHAR, AMS METEOROLOGIST: Right, so what we are dealing with right now is we have a tornado watch and severe thunderstorm watch across portions of Texas. We also have a severe thunderstorm watch for areas of the northeast as well and a brand-new tornado warning in Virginia. Now, it was just about three hours ago that we actually had a likely tornado cross the area of Ellicott City, Maryland. You can see the tornado in the background, a very defined shape. The unfortunate part about this, it has caused some damage. This is aerial video that you are looking at. You can see a lot of trees down across Howard County, Maryland, and the threes are all in different directions. And that's really the sign that tells us it was not straight line winds but rather you're seeing that rotation, which means it very much likely was a tornado that went through this particular area here. The other story we have been covering is the flooding across portions of the central U.S., look at the last 30 days. You have areas that picked up in excess of 20 inches of rain, again places like Oklahoma, Kansas and even portions of Missouri dealing with those high totals. So, it is no surprise what so far that you have so many river gauges that are at or above flood stage. A quick look at these numbers, again -- well, over 200 of them in those flood stages. Unfortunately, one in particular is that Arkansas River at Van Buren. Back to you.</s>BLITZER: All right. Allison, thanks very much. Very disturbing weather information. Allison Chinchar reporting. I'm Wolf Blitzer. Thanks very much for watching. You can follow me on Twitter and Instagram @wolfblitzer. You can always tweet the show @CNNsitroom. "ERIN BURNETT OUTFRONT" starts right now.
Extreme Weather; Millions on East Coast Under Severe Thunderstorm Watch As Historic Flooding Inundates Midwest.