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NEXRAD or Nexrad (Next-Generation Radar) is a network of 159 high-resolution S-band Doppler weather radars 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 Department of Transportation, and the U.S. Air Force within the ...
The scale of dBZ values can be seen along the bottom of the image. Decibel relative to Z, or dBZ, is a logarithmic dimensionless technical unit used in radar. It is mostly used in weather radar, to compare the equivalent reflectivity factor (Z) of a remote object (in mm 6 per m 3) to the return of a droplet of rain with a diameter of 1 mm (1 mm 6 per m 3). [1]
The orthometric height (symbol H) is the vertical distance along the plumb line from a point of interest to a reference surface known as the geoid, the vertical datum that approximates mean sea level. [1] [2] Orthometric height is one of the scientific formalizations of a layman's "height above sea level", along with other types of heights in ...
Examples include NEXRAD Doppler weather radar (which uses a parabolic dish) and the AN/SPY-1 passive electronically scanned array radar employed by the Ticonderoga class of guided missile cruisers and other ships so equipped with the Aegis Combat System. Stacked beam radars emit and/or receive multiple beams of radio waves at two or more ...
Complicating the comparison of the two measurements are that NOMAD buoys report winds at a height of 5 metres (16 ft), while ships report winds from a height of 20–40 metres (66–131 ft). [24] Sea surface temperature measured in the intake port of large ships have a warm bias of around 0.6 °C (1 °F) due to the heat of the engine room. [ 25 ]
Multifunction Phased Array Radar (MPAR) was an experimental Doppler radar system that utilized phased array technology. MPAR could scan at angles as high as 60 degrees in elevation, and simultaneously track meteorological phenomena, biological flyers, non-cooperative aircraft, and air traffic.
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The VIL measurement is usually used in determining the size of prospective hail, [3] the potential amount of rain under a thunderstorm, and the potential downdraft strength when combined with the height of the echo tops. [citation needed] VIL can be used to triage storms based on their severe potential. It is sometimes still used to assess ...