Doppler radars reflect weather projections use beams of energy to reflect the movement of the atmosphere. These maps convey the conditions of the atmosphere based on the Doppler Effect which is a concept of changes in frequency over a distance between the source and the moving target which in this case is a storm passing over North Florida and South Georgia in the picture above. These depictions use colors to represent the weather conditions and the severity of a storm as a warning system for viewers, letting them prepare for tornados or flooding or blizzards.
http://www.paulsweatherportfolio.net/page12/page23/page31/files/page31_1.gif
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