The Doppler Effect is when a wave gains frequency the closer to the source one goes; likewise it's frequency drops the further you move from the source. Doppler radar plays upon this effect by sending out a radio signal that bounces back once it comes into contact with a specified object. In the case of weather data collection, these radio signals bounce back when they come in contact with some form of precipitation. Depending upon the strength of the signal when it returns, the type and density of the precipitation can be measured, and therefore the weather can be properly evaluated for possible safety risk and changing conditions. This image shown is a Doppler radar image taken in Tallahassee, FL during a strong storm system that moved through. An area of Georgia has a tornado warning box around it and the infamous “hook signature” can be seen.
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