Doppler Radar

http://4warnwxteam.com/2011/04/26/a-brief-explanation-of-how-doppler-radar-works/

Doppler radar is a specialized type of radar that utilizes the Doppler effect by radiating pulse emissions so that accurate weather forecasts can be imaged. Doppler radar creates images at a time lapse radiating from the weather station that houses the doppler radar facility. Doppler radar usually locates precipitation as well as the intensity of the precipitation. The doppler radar image is understood by the color class that depicts light precipitation with the light blue color to heavy precipitation with dark red coloring. The image shown above is a doppler radar image frame from the National Weather Service that depicts a hurricane over Texas from a doppler radar station near Houston.