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2025 Somerset–London tornado

EF4 tornado in Kentucky, U.S.

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Through Mississippi

The supercell that produced this tornado initiated over 400 miles (640 km) away in the south-central Missouri Ozarks region. The supercell produced few tornadoes along its track through Missouri, Illinois, and Kentucky, including a small but intense EF3 tornado that brought destructive impacts to the area south of the village of Blodgett: several homes suffered major damage, mobile homes were destroyed, and trees were snapped. Two fatalities occurred and ten others were injured. Afterwards, the supercell crossed the Ohio River into Kentucky. The supercell produced a brief EF1 tornado near Lamasco and an EF2 tornado near Allegre, damaging or destroying several mobile homes and outbuildings. After the London tornado dissipated, the supercell eventually got absorbed into the mesoscale convective system.

The tornado first touched down in central Russell County, initially causing minor damage to trees and infrastructure before quickly intensifying to EF3 strength, inflicting major damage to a home near Whittle. The tornado weakened and shrunk after crossing into Pulaski County. After crossing Lake Cumberland, the tornado struck the southern side of Somerset at low-end EF3 intensity, inflicting severe to major damage to several homes and businesses. After leaving the city, the tornado tore through parts of the Daniel Boone National Forest at mid-range EF3 to low-end EF4 intensity, shredding and snapping several trees and destroying a couple of homes as the tornado entered Laurel County. The tornado then impacted the southern side of London at low-end EF4 intensity, inflicting catastrophic destruction to several homes, neighborhoods, and industrial buildings, resulting in several fatalities. The tornado dissipated shortly after near the community of Lida. The tornado was on the ground for 90 minutes and tracked for 60 miles (97 km).

Recovery efforts immediately following the tornado were intensive, with several aid organizations, including The Salvation Army and the Federal Emergency Management Agency, traveling to London with relief supplies. Following the tornado, media outlets claimed National Weather Service office in Jackson, Kentucky was understaffed due to the staffing cuts made by Department of Government Efficiency, although the office was fully staffed at the same time of the tornado.

Meteorological synopsis

On May 12, the Storm Prediction Center outlined a Day 5 risk for middle Mississippi River valley. A pacific front associated with May 15 convection was expected to stall across the middle Mississippi and lower Ohio Valleys before moving north as a potent warm front. Ensemble Guidance models at the time were hinting at dewpoints reaching between mid to upper 60s, possibly reaching into low 70s, with the likelihood of one or more linear segments to traverse across the mid-Mississippi, lower Ohio, to potentially into Tennessee valleys. On May 14 at 0730 UTC, The Storm Prediction Center outlined a slight (2/5) risk over much of the Ozark Plateau, Mississippi and Ohio River Valleys, with possibility of seeing scattered discrete supercells, organized clusters, including the chance of a long-lived mesoscale convective system. Medium and long-range guidance model suggest the development of thunderstorms along the warm front, with a surface trough ahead of the mid-level wave will mature. The models depicted an environment where the mean level convective available potential energy (MLCAPE) values were around 3000 J/kg and effective bulk shear of 40-50kn, developing a potent environment, with thermodynamic/kinematic conditions supporting development of long-lived severe weather. Despite this, there were still uncertainties around the event, with persistent disagreement among models still evident in regards to the northward extent of the warm sector, with some recent model runs showing the likelihood of persistent morning convection, and other model runs showing less morning convection.

In the evening hours on the same day at 1730 UTC, an enhanced (3/5) risk was outlined for most of lower Ohio Valley, with one or more organized cluster and couple more discrete supercells. An upper-level trough over the southern High Plains will traverse quickly across the Midwest, strong mid to upper southwesterly flow will overspread the region, the 500 mb jet stream was forecasted to be around 70-90kn. A highly moist airmass was forecasted to be in place extending from southern Missouri into southern Illinois and into northeast Ohio. Increased southerly flow ahead of the cold-front allows the warm-front along the I-70 corridor to lift north throughout the afternoon. Strong destabilization was forecasted to occur as a result of steep mid-level from cooling aloft and dewpoints of mid to upper 60s. Low-level jet around 45-60kn was forecasted to overspread the region due to peak daylight heating into the evening.

The Storm Prediction Center outlined a moderate (4/5) risk over much of the middle Mississippi and lower Ohio Valleys on May 16, with the greatest risk over southeastern Missouri, far northeastern Arkansas, northwestern Tennessee, southern Illinois and Indiana, far southwestern Ohio, and much of Kentucky. The upper-level low centered over the border of North Dakota and Minnesota was expected to move eastward into the middle Mississippi Valley. Following persisting convection from the previous day, a warm front swept over a large region from Missouri to the Ohio and Tennessee Valley regions. Over this region, the atmosphere was expected to sharply destabilize, with mean level convective available potential energy (MLCAPE) values exceeding 2500 J/kg, strong mid-level flow, and deep-layer wind shear exceeding 50 kn (58 mph; 93 km/h) expected to help develop and intensify severe weather and associated supercells. The 06z outlook issued by Chris Broyles and Harry Weinman mentioned the risk of "a high-end long-track tornado...from far southeast Missouri...into western Kentucky".

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