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Phenomena caused by severe thunderstorms. Excessive Lightning. Derecho. Extreme wind (70 mph or greater) Downpours. Heavy rain. Flood, flash flood, coastal flooding. Hail. High winds – 93 km/h (58 mph) or higher.
Severe thunderstorm warning (SVR) – A severe thunderstorm is indicated by Doppler weather radar or sighted by Skywarn spotters or other persons, such as local law enforcement. A severe thunderstorm contains large damaging hail of 1 inch (2.5 cm) in diameter or larger, and/or damaging winds of 58 mph (93 km/h) or greater.
The Storm Prediction Center issues convective outlooks (AC), consisting of categorical and probabilistic forecasts describing the general threat of severe convective storms over the contiguous United States for the next six to 192 hours (Day 1 through Day 8). These outlooks are labeled and issued by day, and are issued up to five times per day.
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The K-Index or George's Index is a measure of thunderstorm potential in meteorology. According to the National Weather Service, the index harnesses measurements such as "vertical temperature lapse rate, moisture content of the lower atmosphere, and the vertical extent of the moist layer." [1] It was developed by the American meteorologist ...
During the same severe weather outbreak at the end of March and the start of April, a school district located in central Illinois, the Washington District 50 Schools, decided to dismiss students ...
Following a relative lull in thunderstorm activity, severe weather and flash flood threats will return to a large swath of the nation's midsection later this week, warn AccuWeather meteorologists.
Ted Fujita. Gregory Stanley Forbes (born August 22, 1950) is The Weather Channel 's long-time severe weather expert and has a significant research background in the areas of severe convective storms and tornadoes. [1] Born and raised near Latrobe, Pennsylvania, [2] Forbes earned a B.S. degree in meteorology at Pennsylvania State University (PSU ...