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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 2013 Washington, Illinois tornado was an unusually powerful and violent tornado that caused catastrophic damage to the city of Washington and several farmsteads in rural central Illinois during the early afternoon of November 17, 2013. The tornado resulted in three fatalities and injured 125 people. This tornado was one of the two violent ...
An observation from the National Weather Service Chicago, Illinois at Lewis University Airport, taken at around 4z (11 p.m. CDT), revealed MUCAPE values of 1556 J/kg, as well as extreme storm-relative helicity values of 644 m 2 /s 2 at 0–1 kilometers and 857 m 2 /s 2 at 0–3 kilometers, where storm-relative values of helicity above 150 m 2 ...
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.
Throughout the evening hours of April 9, 2015, an extremely violent and long-lived multiple-vortex tornadotore through the communities near Rochelleand in Fairdale, Illinois. Part of a larger severe weather event that impacted the Central United States, the tornado first touched down in Lee Countyat 6:39 p.m. CDT (23:39 UTC).
The Storm Prediction Center's Day 1 convective outlook for May 21, 2024, issued at 1300Z, indicating a moderate risk for severe weather over much of Iowa and nearby parts of Wisconsin, Illinois, Missouri, and southeastern Minnesota.
This is a list of meso-gamma mesoscale discussions, which are issued by the National Oceanic and Atmospheric Administration’s Storm Prediction Center for small-scale analysis of mesoscale features, typically during high-confidence and high-impact severe weather events.
The storm killed at least 5 people directly, as well as 2 people indirectly through wildfires partly spawned by the storm, and caused at least $1.8 billion (2021 USD) in damages. [4] The number of tornadoes in this event broke a record for largest outbreak in the month of December that had been set less than a week prior.