A violent storm system swept across the Southern U.S. this past weekend, triggering severe storms and tornadoes. At least 22 people were killed. This imagery from the GOES-East satellite tracks the storm as it develops over the U.S. Plains and moves eastwards towards the Atlantic from April 14-17, 2011. The infrared imagery is colorized to indicate intensity. The darkest orange/red colors are associated with the highest, coldest cloud tops, which are indicative of intense rain and storms.