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NEXRAD
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{{Short description|Network of weather radars operated by the NWS}} {{Infobox radar | name = NEXRAD | image = 2025-03-04 15 58 38 The Fort Dix WSR-88D NEXRAD radar (KDIX) at Joint Base McGuire–Dix–Lakehurst in Manchester Township, Ocean County, New Jersey.jpg | caption = NEXRAD Radar at [[Fort Dix]] in [[New Jersey]] | country = [[United States]] | designer = | manufacturer = | introdate = {{Start date|1988}} | number = 159 in the US, Puerto Rico and Guam plus an additional 3 WSR-88Ds, one in Japan and two in South Korea that are not included in the network | type = [[Weather radar]] | frequency = 2,700 to 3,000 MHz ([[S band]]) | PRF = 320 to 1,300 Hz (according to VCP)<!--pulse repetition frequency--> | beamwidth = 0.96° with 2.7 GHz<br/>0.88° with 3.0 GHz<!--X° (horizontal), X° (vertical)--> | pulsewidth = 1.57 to 4.57 μs (according to VCP)<!--pulse width--> | RPM = 3<!--revolutions per minute--> | range = 460 km for reflectivity<br/>230 km for Doppler velocity<!--{{convert|X|mi|abbr=on}}--> | altitude = <!--{{convert|X|m|ft|abbr=on}}--> | diameter = {{convert|8.54|m|ft|abbr=on}}<!--{{convert|X|m|ft|abbr=on}}--> | height = <!--{{convert|X|m|ft|abbr=on}}--> | width = <!--{{convert|X|m|ft|abbr=on}}--> | azimuth = 0 to 360º<!--X-Yº--> | elevation = -1° to +20° (operations)<br/>up to +60° (test)<!--X-Yº--> | precision = | power = 750 KW | other names = WSR-88D | related = }} '''NEXRAD''' or '''Nexrad''' ('''Next-Generation Radar''') is a network of 159 high-resolution [[S-band]] [[pulse-Doppler radar|Doppler]] [[weather radar]]s operated by the [[National Weather Service]] (NWS), an agency of the [[National Oceanic and Atmospheric Administration]] (NOAA) within the [[United States Department of Commerce]], the [[Federal Aviation Administration]] (FAA) within the [[United States Department of Transportation|Department of Transportation]], and the [[United States Air Force|U.S. Air Force]] within the [[United States Department of Defense|Department of Defense]]. Its technical name is '''WSR-88D''' (''Weather Surveillance Radar, 1988, Doppler''). NEXRAD detects [[precipitation (meteorology)|precipitation]] and [[Earth's atmosphere|atmospheric]] movement or [[wind]]. It returns [[data]] which when processed can be displayed in a [[mosaic]] map which shows patterns of precipitation and its movement. The radar system operates in two basic modes, selectable by the operator – a slow-scanning ''clear-air mode'' for analyzing air movements when there is little or no activity in the area, and a ''precipitation mode'', with a faster scan for tracking active weather. NEXRAD has an increased emphasis on [[automation]], including the use of [[algorithm]]s and automated volume scans.
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