![]() The cell started showing signs of surface-based rotation southwest of Searcy, Arkansas, around 5:30 p.m. One such storm-which formed from the initial mid-afternoon activity near Arkadelphia, Arkansas-matured into a long-lived supercell as it progressed in an unstable, deeply moist, and highly sheared environment this cell ultimately persisted for longer than 550 miles (890 km) over several hours from eastern Arkansas to northeastern Kentucky, producing two large and intense tornadoes along its track, among eleven tornadoes in total. Though this activity lacked much vigor at its onset due to a strong capping inversion, the convective cells began to show organization as they progressed eastward. CST (20:00 UTC), with even weaker activity developing over central Missouri a little over 1 + 1⁄ 2 hours later additional clusters of thunderstorms developed over southwestern Missouri (forming between Bolivar and Carthage, eventually back-building into northeastern Oklahoma) and central Arkansas (forming southwest of Hot Springs) between 5:00 and 5:30 p.m. Initial storms developed across central Arkansas around 2:00 p.m. CST (21:00 UTC), the SPC issued a tornado watch across the highest risk area (encompassing central and eastern Arkansas, west Tennessee, northwestern Mississippi, southeastern Missouri, and southern portions of Illinois and Indiana), the first of eleven issued over subsequent hours over the middle Mississippi Valley. Forecasters indicated that atmospheric conditions favored the development of nocturnal supercells capable of producing long-tracked, strong tornadoes. Īs an intense upper-level trough progressed across the High Plains, with robust instability and moisture return realized across the Mississippi Valley, the SPC expanded the enhanced risk and introduced a moderate risk area from northeastern Arkansas into southern Illinois on the morning of December 10. The following day, the SPC noted increased certainty of organized severe thunderstorm potential extending from southeastern Arkansas northeast into southern Indiana, thereby upgrading that region to an enhanced risk. Despite the potential for a higher-end severe threat to materialize, forecasters expressed uncertainty regarding the extent of instability, degree of directional wind shear, and late timing of potential storms. On December 8, the Storm Prediction Center (SPC) outlined a slight risk of severe weather across a broad area of the Mississippi Valley. Radar collage of a supercell that spawned a tornado family during the outbreak The second significant tornado in an exceedingly long-tracked tornado family, this tornado began just inside northern Obion County, Tennessee, a few miles after another long-tracked EF4 tornado – which traveled through northeast Arkansas, the Missouri Bootheel, and northwest Tennessee – dissipated in western Obion County. It was the deadliest and longest-tracked tornado in an outbreak that produced numerous strong tornadoes in several states 57 fatalities were confirmed in the tornado. Crossing through eleven counties of the Jackson Purchase and Western Coal Field regions during its almost three-hour lifespan, the tornado was exceptionally long-tracked, traveling 165.6 miles (266.5 km) while at times becoming wrapped in rain. ![]() Part of the tornado outbreak of December 10–11, 2021 and tornado outbreaks of 2021ĭuring the late evening of Friday, December 10, 2021, a violent, long-tracked EF4 tornado moved across Western Kentucky, producing severe to catastrophic damage in numerous towns, including Mayfield, Princeton, Dawson Springs, and Bremen. Obion County, Tennessee and Western Kentucky, United States Aerial view of EF4 damage in Mayfield, Kentucky, on December 12, one of several towns impacted by the tornadoĭecember 10, 2021, 8:54 p.m.
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