A public severe weather outlook was issued at this time, and the outlook stated that severe weather was expected that afternoon, with tornadoes, large hail, and strong winds all named as threats. CDT (1630 UTC) updated outlook, certainty had grown stronger that a major severe weather event would occur that afternoon. These features, accompanied by the low pressure system, encouraged very strong storm development along the cold front. At the surface, a cold front was forecast to pass through the region later in the day, while a dryline was forecast to intersect the cold front in Kansas. The system was forecast to evolve into a wave early Monday morning as a trough strengthened from the western United States. CDT (1300 UTC) on May 22, forecasters at the SPC realized that a more intense weather outbreak was likely to occur, and upgraded a large swath of the Midwest to a moderate risk. CDT (1300 UTC), the Storm Prediction Center issued a slight risk of severe storms for much of the upper Plains and the Midwest. Very large hail was forecast, but the tornado threat was forecast to remain isolated. This feature, in addition to steep lapse rates and dewpoints above 60☏, was conducive to the development of supercells later in the day. On the evening of May 21, an area of low pressure was centered over western South Dakota. history the insurance payout was $2.8 billion, the highest in Missouri history, with the previous record of $2 billion being the Aphail storm. It also ranks as the costliest single tornado in U.S. since the 1947 Glazier–Higgins–Woodward tornadoes, and the seventh-deadliest overall. It was the deadliest tornado to strike the U.S. Overall, the tornado killed 158 people (with an additional eight indirect deaths), injured some 1,150 others, and caused damages amounting to a total of $2.8 billion. It was the third tornado to strike Joplin since May 1971. The tornado tracked eastward across the city, and then continued eastward across Interstate 44 into rural portions of Jasper and Newton counties. This particular tornado was unusual in that it intensified and grew in size at a very fast rate. Part of a larger late-May tornado outbreak, the tornado reached a maximum width of nearly one mile (1.6 km) during its path through the southern part of the city. Part of the tornado outbreak sequence of May 21–26, 2011ġ Most severe tornado damage see Enhanced Fujita scaleĪ devastating EF5-rated multiple-vortex tornado struck Joplin, Missouri on the evening of Sunday, May 22, 2011.
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