Tornado Down: Original Edition: The Unputdownable No. 1 Sunday Times Bestseller

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See also: Enhanced Fujita scale, Fujita scale, and TORRO scale Tornado rating classifications [24] [68] F0 Todd, Annie; Galvan, Alfonzo (December 10, 2021). "Sioux Falls issues snow alert; Lincoln County no travel alert: Current road conditions and travel alerts as winter storm continues". Sioux Falls Argus Leader. Archived from the original on December 10, 2021 . Retrieved December 11, 2021. Several trees were downed. This was the third of three brief tornadoes in the path break between the first EF4 tornado and the second EF4 tornado. [51]

In South Dakota, Sioux Falls issued a snow alert. The Lincoln County Sheriff's Office issued a no-travel alert. Several highways, including Interstate 229 and Interstate 90 were snow-covered. [177] Numerous school districts around the area cancelled classes on December 10. [178]Numerous trees were downed as the tornado crossed I-40. This tornado was upgraded to EF1 in March 2023 due to extensive tree damage in rural areas [77] Several homes and businesses were significantly damaged along US 70 near Kingston Springs, including a few houses that sustained partial to total roof loss. Barns and outbuildings were destroyed, and trees and power poles were snapped. One person was injured. [81] a b "Five dead, at least five injured as storms roll through the Mid-South". WHBQ-TV. December 11, 2021. Archived from the original on December 11, 2021 . Retrieved December 11, 2021. On December 8, the Storm Prediction Center (SPC) outlined a slight risk of severe weather across a broad area of the Mississippi Valley. 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. [9] 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. [10]

One storm-related death confirmed in Shelby County". WMC-TV. Gray Television. December 11, 2021. Archived from the original on December 17, 2021 . Retrieved December 17, 2021. a b "Longest tornado ever? Deadly twister that hit 5 states may set record". The Cincinnati Enquirer. Archived from the original on March 17, 2022 . Retrieved December 14, 2021. Arkansas Event Report: EF3 Tornado (Report). National Centers for Environmental Information. National Weather Service in Memphis, Tennessee. 2021 . Retrieved March 19, 2022. Arkansas Event Report: EF3 Tornado (Report). National Centers for Environmental Information. National Weather Service in Memphis, Tennessee. 2021 . Retrieved March 19, 2022. Missouri Event Report: EF3 Tornado (Report). National Centers for Environmental Information. National Weather Service in Memphis, Tennessee. 2021 . Retrieved March 19, 2022. Missouri Event Report: EF4 Tornado (Report). National Centers for Environmental Information. National Weather Service in Memphis, Tennessee. 2021 . Retrieved March 19, 2022. Tennessee Event Report: EF2 Tornado (Report). National Centers for Environmental Information. National Weather Service in Memphis, Tennessee. 2021 . Retrieved March 19, 2022. Missouri Event Report: EF2 Tornado (Report). National Centers for Environmental Information. National Weather Service in Memphis, Tennessee. 2021 . Retrieved March 19, 2022. Tennessee Event Report: EF4 Tornado (Report). National Centers for Environmental Information. National Weather Service in Memphis, Tennessee. 2021 . Retrieved March 19, 2022. Tennessee Event Report: EF2 Tornado (Report). National Centers for Environmental Information. National Weather Service in Memphis, Tennessee. 2021 . Retrieved March 19, 2022. Georgia Event Report: EF0 Tornado (Report). National Centers for Environmental Information. National Weather Service in Atlanta, Georgia. 2021 . Retrieved March 20, 2022. Illinois Event Report: EF1 Tornado (Report). National Centers for Environmental Information. National Weather Service in Lincoln, Illinois. 2021 . Retrieved March 19, 2022.A house and a tobacco barn sustained major roof damage, a second house sustained minor roof and gutter damage, and several trees were downed. [90] Tornadoes in the dissipating stage can resemble narrow tubes or ropes, and often curl or twist into complex shapes. These tornadoes are said to be "roping out", or becoming a "rope tornado". When they rope out, the length of their funnel increases, which forces the winds within the funnel to weaken due to conservation of angular momentum. [28] Multiple-vortex tornadoes can appear as a family of swirls circling a common center, or they may be completely obscured by condensation, dust, and debris, appearing to be a single funnel. [29]

Storm bringing snow, strong winds to southern Minnesota, northern Iowa". KIMT. KIMT. December 10, 2021. Archived from the original on December 12, 2021 . Retrieved December 12, 2021. Authorities release name of victim in Leachville tornado". KAIT. Gray Television. December 10, 2021. Archived from the original on December 11, 2021 . Retrieved December 12, 2021. Amber Ruch (December 11, 2021). "Gov. Parson tours storm damage in Pemiscot Co.; 2 confirmed deaths in Mo., hundreds of homes damaged or destroyed". KFVS-TV. Gray Television. Archived from the original on December 13, 2021 . Retrieved December 13, 2021– via KAIT. While direct measurement of the most violent tornado wind speeds is nearly impossible, since conventional anemometers would be destroyed by the intense winds and flying debris, some tornadoes have been scanned by mobile Doppler radar units, which can provide a good estimate of the tornado's winds. The highest wind speed ever measured in a tornado, which is also the highest wind speed ever recorded on the planet, is 301±20mph (484±32km/h) in the F5 Bridge Creek-Moore, Oklahoma, tornado which killed 36 people. [117] The reading was taken about 100 feet (30m) above the ground. [3]

How are tornadoes formed?

Tennessee Event Report: EF0 Tornado (Report). National Centers for Environmental Information. National Weather Service in Nashville, Tennessee. 2021 . Retrieved April 18, 2022. Tennessee Event Report: EF0 Tornado (Report). National Centers for Environmental Information. National Weather Service in Nashville, Tennessee. 2021 . Retrieved April 18, 2022. Tennessee Event Report: EF0 Tornado (Report). National Centers for Environmental Information. National Weather Service in Nashville, Tennessee. 2021 . Retrieved April 18, 2022. Tennessee Event Report: EF2 Tornado (Report). National Centers for Environmental Information. National Weather Service in Nashville, Tennessee. 2021 . Retrieved April 18, 2022. a b c "As cleanup continues, Missouri officials assessing damage from Friday's tornadoes". FOX 2. December 12, 2021. Archived from the original on December 14, 2021 . Retrieved December 14, 2021. Gooden, David Carson, Christian (December 11, 2021). "Photos: Severe storms level homes, cause widespread damage in Defiance, St. Charles County". STLtoday.com . Retrieved October 8, 2023. {{ cite web}}: CS1 maint: multiple names: authors list ( link)