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A high risk severe weather event is the greatest threat level issued by the Storm Prediction Center (SPC) for convective weather events in the United States. On the scale from one to five, a high risk is a level five; thus, high risks are issued only when forecasters at the SPC are confident of a major severe weather outbreak.
The Storm Prediction Center issues daily outlooks denoting the risk for severe weather and wildfires for specific regions in the United States. For severe weather, which includes the risk for thunderstorms, tornadoes, hail, and straight-line winds, there are five risk levels indicating the probability for these hazards: marginal, slight, enhanced, moderate, and high.
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.
The best way to stay safe during a nocturnal tornado threat is to have multiple ways to receive severe weather warnings. At the very least, make sure emergency alerts are enabled on your smartphone.
April 15, 2024 at 3:59 AM. A pair of storm systems threatens more than 40 million people across parts of the Central and Eastern US on Monday, both capable of producing large hail, damaging winds ...
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.
During a severe storm warning, the National Weather Service advises taking immediate action to ensure personal safety. Shelter indoors, preferably in a sturdy building, away from windows and doors.
Particularly dangerous situation. In weather forecasting in the United States, " particularly dangerous situation " ( PDS) is enhanced wording used by the National Weather Service to convey special urgency in some watch or warning messages for unusually extreme and life-threatening severe weather events, above and beyond the average severity ...