Nightly News | May 17, 2011
BRIAN WILLIAMS, anchor: You're looking right now at how one of the worst months for tornadoes ever in this country looked from space. A NOAA satellite captured images of the storm systems that swept across the South during April. We've sped it up here and put it on a continuous loop. Six hundred twenty-five tornadoes have been confirmed; each one represented on this map, when you look hard at it, as a red dot. Of course, the worst of it was April 27th , 28th. More than 300 people were killed in over 180 separate twisters from Texas to Virginia . It's a mesmerizing look to take a nice long look at. You can see the whole thing on our Web site tonight, nightly.msnbc.com.