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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 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.
The convergence of all these factors promised the development of intense convective thunderstorms. [3]: 2 This risk was anticipated by the National Weather Service's Storm Prediction Center (SPC), and its local forecast office in Norman, Oklahoma. The Storm Prediction Center's outlooks for severe weather culminated in a "high risk" area being ...
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.
Once again, a moderate risk of severe weather was issued on May 23—this time for the southern Plains and the lower Great Lakes.Forecasts showed that the main threats would be damaging wind and large hail instead of frequent tornadoes; the stationary front lacked the necessary wind shear to sustain the type of tornadic supercells seen on May 22.
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. [1][2][3][4][5] These can be for tornadoes believed to be at least EF2 on ...
John E. "Jack" Hales Jr. is a retired American meteorologist specializing in severe convective storms and tornadoes. Hales spent most of his nearly 50-year National Weather Service (NWS) career as a national lead severe storms forecaster at the Storm Prediction Center (SPC) in Norman, OK, formerly known as the National Severe Storms Forecast Center.
A weather map shows the chances of severe weather affecting the Midlands. No warnings or watches have been issued, but that is subject to change as the storms get closer.
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related to: spc severe weather outlook for may 22 2011 convective outlookweather.com has been visited by 100K+ users in the past month