Doppler radar utilizes microwaves to track direction and speed of suspended water droplets in the atmosphere. It also determines whether atmospheric motion is horizontally toward or away from the radar. I like watching the map as it moves!
Doppler radar was named after J. Christian Doppler, an Austrian physicist, who in 1842 explained why the whistle of an approaching train had a higher pitch than the same whistle when the train was going away!
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