This is an image showing Doppler Radar. Radar (radio detection and ranging) uses a transmitter to emit either radio or microwave radiation (in which case we call it Doppler) and a directional antenna to receive and measure the time of arrival of reflected pulses from distant objects. Doppler is commonly used to make atmospheric profiles of clouds. This includes their motion and the composition of the particles in the air, particularly precipitation.
This map is from NOAA National Weather Service showing a Doppler Radar image in Houston, Texas, of Hurricane Claudette as it makes landfall on July 15, 2003. The various colors represent rain intensity levels.
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