The blue ovals are the beam emitted in the horizontal and the green ovals are the beam emitted in the vertical plane along a given medium. A cartoon illustrating the functionality of a polarimetric weather radar as it rotates about its axis. After a multitude of complex processes within the radar, it is displayed into the imagery that we see on a daily basis. This portion of the beam that returns to the radar is captured through the receiver (which is also the same antenna that emitted the signal). Image of the KOUN research radar at the NOAA Radar Operations Center in Norman, Oklahoma. These emitted pulses travel at the speed of light and when they pass through an object such as a raindrop, a portion of the beam returns to the radar due to scattering. Since the implementation of polarimetric radar, Doppler radars work by emitting pulses in both the horizontal and vertical plane. The use of the polarimetric radar variables has been a crucial element in weather forecasting operations, research, and in public consumption.ĭoppler weather radars rotate about their axis, and are Planned Position Indicators (PPIs). In 2013, the entire WSR-88D network was upgraded to dual-polarization capabilities, meaning that the Doppler radar can emit pulses in both the horizontal and vertical plane. The National Weather Service’s Weather Surveillance Radar-1988 Doppler (WSR-88D) network across the United States consists of 155 Doppler radar sites operated by the National Oceanic and Atmospheric Administration (NOAA).
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