>> yeah. well, there's no doubt about it. thank you so much for talking to us. i'm just so glad things worked out for you. stay strong. i hope your head's okay. >> yes. thank you for all the teachers and for all the kids that just followed directions. >> that's great. thank you so much. good luck. as we said at the top, survey crews today took a look at the destruction, put this tornado at an ef-5. to explain how they made that determination, and what exactly that means, i want to quickly check in with chad myers in the cnn weather center. what does that mean, ef-5? >> it means that a structure, a well-built structure, well attached to a foundation or slab, was completely wiped away in one place or another. they have found more than one place where these homes are just completely gone. behind me, the classic shape of a super cell tornado. this was yesterday around 3:45 in the afternoon. the head of the storm here, hail core here, the comma, the tail of the storm here, the tornado