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building. the girls had started getting people in their bathrooms and for those that could and then pulling people away from the windows. so they re the heroes tonight. regardless of how erratic the storms actually were. we have the ability to see inside of a tornado using these very powerful, very sensitive radars , and without even having an eyewitness account on the ground we use what is called the correlation coefficient so basically picks up on anything that is not a raindrop, not a snowflake in erratic size, and that indicates that debris is being lofted in the air. this is a velocity scan that shows us motion moving towards the radar and motion moving away from the radar so we can pinpoint right. where the tornado actually forms and continues to move on so very, very impressive and very sensitive storm systems that we re able to use. and that is, of course, the result with the wedge tornado that created the destruction on the ground. we still have ongoing

Eyewitness accountCorrelation coefficientVelocity scanStorm systems