April 27th, 2011 will go down as the deadliest tornado day in well over half a century. Hundreds of twisters are touching down all over parts of Mississippi and Alabama known to chasers as "Dixie Alley". There are multiple confirmed EF-5 tornadoes, the most powerful classification. Teams Dominator, TWISTEX and TIV are all in Dixie Alley and on the hunt, with front row seats to some of the day's most breathtaking storms. Acting as storm spotters, they're reporting the tornadoes and attempting to get warnings out. But when a violent twister tracks toward the heart of Tuscaloosa, Alabama, all three teams are faced with death and destruction on an unimaginable scale.