Lhermitte, Roger M. Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida.
Last reviewed:March 2022
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- Meteorological systems
- Single radar
- Multiple radars
- Millimeter-wave radars
- Related Primary Literature
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A radar system used to measure the relative velocity of targets and their position. The operation of these systems is based on the fact that the Doppler frequency shift in the target echo is proportional to the radial component of target velocity. In the United States, the National Weather Service operates a network of 160 weather radars (NEXRADs; Next Generation Weather Radars; Fig. 1). NEXRADs have the capability of measuring both reflectivity and radial velocity of the hydrometeors (rain drops, snowflakes, hail) throughout the storm volume, enabling forecasters to infer the internal circulations (wind speed) within the storms. See also: Doppler effect; Radar; Radar meteorology
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