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2010 Yazoo City tornado

2010 EF4 tornado in Mississippi, U.S

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Through Tornado, Mississippi and President of the United States

An intense supercell produced the tornado 6 miles (9.7 km) west of Tallulah and almost immediately intensified to EF3 strength, maintaining that intensity before crossing the Mississippi River. The tornado crossed into Mississippi at EF2 intensity, inflicting severe damage to structures and vegetation. The tornado intensified further to low-end EF4 strength south of Yazoo City. Several homes and businesses were demolished and heavy deforestation occurred. The tornado inflicted EF2-EF3 damage and maintained intensity before restrengthening to low-end EF4 intensity southwest of Durant, destroying a couple of homes. Following this period of restrengthening, the tornado weakened, fluctuating between EF1 and EF2 strength before strengthening back to high-end EF3 intensity in southern Choctaw County. The tornado weakened afterwards before lifting north of Sturgis. Initially, there were uncertainties about whether this was one continuous tornado or a series of tornadoes, before further surveying concluded that it was one unified track. Throughout the path, three tornado emergencies were issued for multiple counties by the National Weather Service (NWS) office in Jackson, Mississippi.

The tornado was the largest on record for the state for over 10 years, with a maximum width of 3,080 yd (2,820 m). The tornado was, at the time, the ninth-deadliest tornado in Mississippi on record, and the deadliest to occur in the state since 1992. It was the first violent tornado to occur in Mississippi in the month of April since 1978. Along the tornado's path, 849 homes, businesses, and structures were damaged or destroyed. Hundreds of residents across the affected counties were left without electricity, and severe damage was inflicted to agriculture and timber.

After the tornado, U.S. President Barack Obama declared a federal disaster in Mississippi. The governors of Louisiana and Mississippi, Bobby Jindal and Haley Barbour, declared states of emergencies for the parish and counties affected by the tornado in their respective states. National Guardsmen were deployed to Yazoo City and search and rescue operations occurred across the affected areas. In the relief effort, help from state officials, several organizations, local businesses, and non-profit groups, including The Salvation Army, arrived in affected areas. The recovery and clean up effort removed tens of million tons of debris throughout the tornado's path. Afterwards, several businesses and homes were repaired or rebuilt.

Meteorological setup

Episode narrative

Forecasting in advance

On April 20, the American weather forecasting agency, Storm Prediction Center (SPC), first highlighted a severe weather risk for the lower Mississippi River basin region for April 24. Near or ahead of an advancing front was a favorable kinematic. the behavior of atmospheric motion, and thermodynamic, the heat-to-work transformation in the atmosphere, environment. The SPC noted factors that indicated potential tornadic activities, a boundary layer, an area of moist air moving into an area, and strong wind shear. Large hail and damaging winds were also expected. A large upper-level trough was forecast to move slowly across the central United States and center over Illinois. A strong southwesterly flow aloft was forecasted to spread across the Mississippi Valley into the Gulf Coast Region. Within the area south of the Ohio Valley, a strong wind field was spreading across the region.

Day of the event

At 12:57 a.m. CDT on April 24, a high risk for severe weather was designated over portions of Louisiana, Mississippi, Alabama, and Arkansas. The risk was accompanied by a 30% hatched risk, an enhanced probability for severe weather, for strong tornadoes, severe hail, and strong damaging winds for the area. A strengthening upper-level storm system traversed across the Central United States. A cold front moved easterly from the central southern Mississippi River Valley into the Ohio River Valley. Severe thunderstorms developed during the morning hours, with conditions expected to become more favorable throughout the day. A potent wind shear was expected to spread across the moist, warm sector, which is a region of warm air ahead of the cold front.

Discrete, cyclic supercells were forecasted over the high risk zone in the mid-morning into the afternoon, with convective clusters and lines of embedded supercells also likely. Forecast soundings, observations that deciphers the environment of an area, over the high risk area showed a 60–70 mph (95–115 km/h) low-level jet (LLJ). Supporting the LLJ was a large hodograph, which plot winds with soundings from Earth's atmosphere. The storm relative helicity, the potential for updraft rotation, of 300-600 joules per kilogram (J/kg) and the mid-level convective available potential energy, the potential energy for thunderstorm development, of 1500—2500 j/kg were also noted.

At 9:31 a.m. CDT, upper air analysis showcased the upstream trough had negatively tilted, with an embedded jet-stream traversing east-northeast into the Ark-La-Tex region. The jet-stream was expected to transfer into regions in the mid to lower Ohio valley later in the afternoon. The surface low tracked northward from Arkansas to St. Louis as it underwent significant deepening. Morning convection was expected to move into the Tennessee Valley and become elevated, no longer surface-based, over time as they moved into the Cumberland Plateau and Appalachian Mountains.

Event narrative

Storm initiation

At 10:28 a.m. CDT, a couple of large thunderstorms began demonstrating supercell characteristics in southeastern Mississippi. The storms were forecasted to move into Alabama throughout the late morning hours. Large-scale ascent continued downstream, with further destabilizing of the warm sector occurring over the lower Mississippi valley. Favorable low-level wind shear and a moist and unstable boundary layer maintained the possibilities of strong tornadoes throughout the afternoon. Multiple discrete supercells began ahead of the developing quasi-linear convective system (QLCS), which is a line of thunderstorm riding along a cold front.

Particularly Dangerous Situation

At 11:30 a.m. CDT, a particularly dangerous situation (PDS) tornado watch was in effect across several states, with a high probability of multiple significant tornadoes, large hail, and strong straight-line winds up to 80 mph (130 km/h). As the surface low deepened, a shortwave trough rotated across the area. The SPC noted that tornadic supercells were already in progress across Mississippi, with strong wind shear profiles expected to spread north and east. Additionally, a rapidly moving squall line was moving across northern Arkansas, forecasted to evolve into a strong QLCS with intense, damaging winds.

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