Doppler Radars send microwave signals and records the frequency of the returns and can be used among other things to track the speed of things cars (police speed guns). Doppler Radar is more known today for its use in weather maps. Those maps use a variation on the true Doppler technique tracking the speed of precipitation. Oftentimes, the public will confuse Doppler Radar as interchangeable with weather radar. This Doppler Radar effect image is of Hurricane Katrina on Aug. 28, 2005.
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