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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.
Some of the deadliest severe weather and wildfire days in recent history did not have a high risk or extremely critical outlook issued. For example, the 2011 Joplin tornado, which killed 158 people occurred on a moderate risk day, as did the tornado outbreak of December 10–11, 2021, which killed 89 people.
Day 4–8 outlooks are the longest-term official SPC Forecast Product, and often change significantly from day to day. This extended forecast for severe weather was an experimental product until March 22, 2007, when the Storm Prediction Center incorporated it as an official product.
A multiple-day severe weather outbreak packing powerful wind gusts, tornadoes, large hail and flash flooding will pose a significant risk to lives and property in the middle of the United States ...
Following a relative lull in severe weather to end last week and start this one, Tornado Alley could roar back to life beginning later this week, as a severe weather event is expected to unfold ...
Dangerous severe weather, tornado outbreak to continue for 3rd day in central US. The number of severe thunderstorms and tornadoes will increase over the central United States with dangerous ...
Progression of a well-anticipated extremely critical event across the Central Plains on March 6, 2017. This event produced wildfires that burned 1,200,000 acres of land, and killed seven people. An extremely critical fire weather event is the greatest threat level issued by the NWS Storm Prediction Center (SPC) for wildfire events in the United ...
Much of Wisconsin will face severe weather on Tuesday, as three rounds of storm systems pass through the state and bring the possibility of damaging winds, hail and tornadoes. The National Weather ...