. >> reporter: as children growing up in tosrnado alley, kevin, lauren and colt saw severe weather every spring. now as adults, chasing tornadoes is their passion. >> right here. >> our group mission as storm chasers and as base hunters is to document and see all these tornadoes -- >> wow. that is a long rope. it goes way back. yeah. >> -- right along side that is getting early warning out to the weather service as quick as possible. >> reporter: but the 2013 tornado season was starting out slowly. >> this year was interesting in that we've had kind of a later spring. we thought, maybe 2013 is going to be mild. >> a benign and quiet april, may. >> we're in a tornado drought. over the last couple days and over the weekend, the jet changed. >> finally now all the ingredients coming together. >> so the cold air is one side, the warm air is on the other side. when the conditions are right, those super cells will begin to spin. when one storm gets to use all of that heat, it becomes the big dog. >> reporter: the conditions were right. >> look at these pictures. simply extraordinary. >> report