http://oceanservice.noaa.gov/education/yos/resource/JetStream/doppler/baserefl.htm
A Doppler radar is a specialized radar that utilizes the doppler effect in order to produce velocity data, regarding objects at a considerable distance. This is done by beaming microwave signals towards the desired target, and then listening for its reflection. The frequency of the returned signal is analyzed, and how the sound has been altered by the object's motion is particularly noted. The variation in frequency gives a direct and highly accurate measurement of the target velocity relative to the radar. This is seen and used in weather all of the time - weather forecasters toss the phrase 'doppler radar' around so much that it has become synonymous with meteorology. However, Doppler radar has a wide variety of uses: aviation, police speed guns, radiology, etc.
The map above shows the Doppler Radar of Frederick, Ohio (in center).
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