Doppler Radar is a device that makes use of the doppler effect to produce data of objects that are at a distance. It beams a microwave signal towards a desired target and listening for its reflection. It then analyzes how the original signal has been altered by the objects that reflected it. The doppler effect is the change in a frequency of a wave for an observer moving relative to the source of waves. Doppler refers to the principle the Austrian scientist Christian Doppler discovered in 1842. Doppler worked out his ideas using sound waves, long before radio, much less radar, was invented. As you look at the Doppler Radar above you can see the radar image from the National Weather Service. It shows that there is a major storm around the Orlando area and is moving north west at about 40 DBZ's.
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