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North Warning System. The North Warning System (NWS, French: Système d'alerte du nord) is a joint United States and Canadian early-warning radar system for the atmospheric air defense of North America. It provides surveillance of airspace from potential incursions or attacks from across North America's polar region.
Map of regions covered by the 122 Weather Forecast Offices. The National Weather Service operates 122 weather forecast offices in six regions. Each weather forecast office (WFO or NWSFO) has a geographic area of responsibility, also known as a county warning area, for issuing local public, marine, aviation, fire, and hydrology forecasts.
In a comment on a Facebook post , the NWS said this afternoon's storms are "expected to be very dangerous". Thunderstorms will likely start in west Iowa around 2 p.m., making their way to Des ...
Storms are likely on Tuesday during the day and are expected to produce heavy rainfall after 1 p.m., when the strongest storms are expected. NWS says severe weather such as hail and tornadoes is ...
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 National Weather Service warns of possible severe storms late Saturday night into Sunday morning. In a social media post on Saturday afternoon, NWS Des Moines posted an update for the forecast ...
Weather radar, also called weather surveillance radar ( WSR) and Doppler weather radar, is a type of radar used to locate precipitation, calculate its motion, and estimate its type (rain, snow, hail etc.). Modern weather radars are mostly pulse-Doppler radars, capable of detecting the motion of rain droplets in addition to the intensity of the ...
Doppler effect. The emitted signal toward the car is reflected back with a variation of frequency that depends on the speed away/toward the radar (160 km/h). This is only a component of the real speed (170 km/h). The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference ...