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In many of those places trying to determine what hit them. rob marciano joins us now. he's joins us from tuscaloosa. you spent the day with the national weather service trying to determine tornado strength. what did you learn? >> reporter: well, i learned that it's a slow and arduous process. forensic meteorology, they have to get in there and see how a structure is built before they can determine how it was ripped apart. i went out with tim marshal, considered to be the rock star of this type of work. he helped develop the enhanced fujita scale, the scale we use today. he doesn't have officia...