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The WSR-1 or Weather Surveillance Radar-1 was one of the first weather radars. The WSR-1 series was a modified version of the AN/APS-2F radar, which the Weather Bureau (now the National Weather Service) acquired from the Navy. The WSR-1A, WSR-3, and WSR-4 were also variants of this radar. The first WSR-1 in the USA was at Washington National Airport in Washington, D.C.
References
WSR-1 Wikipedia(Text) CC BY-SA