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http://www.radaronline.com/

Latest weather radar images from the National Weather Service
http://radar.weather.gov/

Radar is an object-detection system that uses electromagnetic waves - specifically radio waves - to identify the range, altitude, direction, or speed of both moving and fixed ...
http://en.wikipedia.org/wiki/Radar

AccuWeather.com Weather Radar comprehensive radars including this United States Weather Radar
http://www.accuweather.com/us/radar/sir/us_/radar.asp

radar n. A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of very high frequency
http://www.answers.com/topic/radar