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Outlook Region Date 159 Tornado outbreak sequence of May 21–26: Midwestern U.S. May 22, 2011 76 United States–Canada tornado outbreak: Northeastern U.S., Great Lakes region: May 31, 1985 72 Tornado outbreak of December 10–11: Middle Mississippi River Valley: December 10, 2021 42 Kissimmee tornado outbreak: Southeastern U.S. February 22, 1998
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.
From May 21 to May 26, 2011, one of the largest tornado outbreaks on record affected the Midwestern and Southern regions of the United States. A six-day tornado outbreak sequence, most of the tornadoes developed in a corridor from Lake Superior southwest to central Texas, while isolated tornadoes occurred in other areas.
The 2011 Joplin tornado was a large and devastating multiple-vortex tornado that struck Joplin, Missouri, United States, on the evening of Sunday, May 22, 2011.Part of a larger late-May tornado outbreak, the EF5 tornado began just west of Joplin and intensified very quickly, reaching a maximum width of nearly one mile (1.6 km) during its path through the southern part of the city.
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 ...
On May 30, two days before the outbreak, the Storm Prediction Center (SPC) noted the possibility of a severe weather event in the Northeastern United States in their outlook. A storm system was forecast to draw warm, moist air (with dew points over 60 °F (16 °C)) from the south, ahead of a driving cold front.
May 22 High-end EF3 damage to an industrial building in Jefferson City, Missouri. The outbreak on this day had been poorly forecasted. The initial risk issued by the Storm Prediction Center on May 20 was only marginal while also being well west from where the severe weather event took place. The next day the outlook was expanded and upgraded ...
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.