like a hot air balloon. when the sun comes out, heats the ground, the ground warms up and the air wants to rise. as the air rises into space, it goes up higher and higher and gets into colder and colder air so the particles congeal, the humidity comes in and goes straight up into the air and you see the towering cumulus clouds, like everything in the northern hemisphere that spins to the right and everything in the southern hemisphere that spin to the left. if you move this stuff long enough on the way up, literally, 60,000 feet in the sky, 12 miles from the surface to the top, you will get this spin. eventually, the whole storm spins and then the back half we call it the mesocyclone, the conservation of ang you lar momentum, like an ice skail skater bringing her arms in. she skates and skates faster. the more -- the closer her arms are in and at the bottom of the mesocyclone a tornado falls out of this storm. >> well, it has been a month since tornadoes ravaged alabama. coming up next, we'll look at the slow recovery efforts there