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Cape Cod Cape Cod Area Weather: NEXRAD Radar Loop

National Weather Service Boston Zone radar loop: NEXRAD (Next Generation Radar) obtains weather information (precipitation and wind) based upon returned energy. The radar emits a burst of energy (green). If the energy strikes an object (rain drop, bug, bird, etc), the energy is scattered in all directions (blue). A small fraction of that scattered energy is directed back toward the radar.

The above radar image is Composite Reflectivity:

This display is of maximum echo intensity (reflectivity) from any elevation angle at every range from the radar. This image is used to reveal the highest reflectivity in all echoes. When compared with Base Reflectivity, the Composite Reflectivity can reveal important storm structure features and intensity trends of storms.

When viewing composite reflectivity images, always check the time of the image. Often, the base reflectivity image and composite reflectivity image will not have the same time with the base reflectivity image being the most recent.

When compared with Base Reflectivity, the Composite Reflectivity can reveal important storm structure features and intensity trends of storms. This is important because often during the development of strong to severe thunderstorms, rain-free areas (or areas with light rain) develop as a result of strong updrafts.

JetStream - Weather: RIDGE radar composite reflectivity - srh.noaa.gov -- source

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Cape Cod
Posted by Cape Cod - (website) on 08/15/06
Categories: Weather
Keywords: radar, weather, nexrad


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