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The first one was changes in barometric pressure observed within this storm. So, good guess. The National Weather Service is very cautious when issuing tornado warning because this is one of the most urgent and furious warnings. The National Weather Service monitors wind shear observed by Doppler radar to determine if the severe thunderstorm has enough rotation to produce a tornado. The National Weather Service also considers information relayed by trained weather spotters and local law enforcement officers in determining if the tornado warning should be issued or not. And I mentioned spotter numbers earlier. Folks, that is some fascinating training even if you don't ever use it. But if you do, you get the training and get your spotter number, then that's what they're talking about. They teach you how to recognize certain weather phenomena and...