measured up, i want to check with chad myers and the weather center. chad, explain the ranking system? >> when you get an ef-5, that means some building doesn't exist anymore. by the three, you're losing an outside wall, four, you'll lose a lot of walls and five you'll lose everything. that's where we are now. 200, 210 miles per hour. when that tornado was on the ground as an ef-4, this is what it looked like. now we can look inside the storm and see how high that debris was picked up, sucked up and inside of the atmosphere. we know now that checks, photographs were found in tulsa, almost a hundred miles away.