of its path. >> the way the inclusion is getting bigger, it's right here. >> then own monday may 20th, they plan their next moves. >> we look at the weather models, predicting where the strongest ones aloft are going to be service barriers that will initiate storms. >> we actually started out going south of the norman and moore area. we're looking at the radar and it had what we like to say just the look of a strong thunderstorm and that's when we made the decision to go north on i-35. >> in you're anywhere from north of newcastle right into moore, this your storm. >> just before 3:00 p.m. central time cnn meteorologist chad myers spotted the telltale signs of a tornado. >> you look down it was a ball. the next time i looked at that doppler radar there was a hook echo on the bottom. and i looked at it, i looked at