think of this as bubbling. the air bubbles up. you get clouds that become taller and taller. they're turning into cumulus nimbus. because the whole world is spinning. if you get this storm all by itself part of the back of the storm can turn into a low pressure system itself a small cyclone. and here's the picture of the cyclone on joplin, missouri, yesterday. it actually looks like a big hook echo. we talk about this hook. it is hailing here. it is storming back here. but right through here not much is going on. if you want to be a storm chaser you want to be here. you don't want to be here in the hail core and you don't want to be here for very long. >> you don't want to be there at all. >> what stopped people from taking great pictures of this is because this was called a rain wrapped tornado. by the time it got to joplin, it was wrapped up in rain. the tornado was many the middle of the rain. all you saw was a bunch of rain moving around. not realizing there was a 200