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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 ...
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 first Weather Bureau radiosonde was launched in Massachusetts in 1937, which prompted a switch from routine aircraft observation to radiosondes within two years. The Bureau prohibited the word "tornado" from being used in any of its weather products out of concern for inciting panic (a move contradicted in its intentions by the high death tolls in past tornado outbreaks due to the lack of ...
AccuWeather meteorologists say much of the Northeast will be sweltering in heat while some cool air hangs on in parts of the northern and eastern tier. Others will be blasted by powerful late ...
Severe thunderstorms erupted on Saturday afternoon and evening with more than 80 incidents of strong winds or damaging wind gusts. Locally heavy rain, up to 3 inches in some areas, triggered urban ...
The severe weather in the Midwest will erupt near the center of the storm system, while severe storms extend from northern Florida to at least as far to the north as Maryland and Delaware in the ...
Mesoscale meteorology is the study of weather systems and processes at scales smaller than synoptic-scale systems but larger than microscale and storm-scale. Horizontal dimensions generally range from around 5 kilometres (3 mi) to several hundred kilometres. Examples of mesoscale weather systems are sea breezes, squall lines, and mesoscale ...
Locally severe thunderstorms are forecast along Interstates 20, 40, 64, 70, 76, 77, 81, 85, and others on Friday afternoon and evening, in addition to I-95. Hail may also occur in stronger storms ...