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2020 Hampton County tornado

2020 tornado in South Carolina, U.S.

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Originally rated EF3 with maximum wind speeds of 165 mph (266 km/h) on the Enhanced Fujita scale, the tornado was later upgraded to an EF4 tornado after a two-story house was found to have been leveled by estimated wind speeds of 172 mph (282 km/h). It was the first F4/EF4+ tornado to occur in the Lowcountry since reliable records began in 1950, and the first F4/EF4+ tornado to occur in the state of South Carolina since November 1995.

Meteorological synopsis

On the morning of April 12, 2020, the Storm Prediction Center outlined a slight risk for severe weather across much of the western portion of South Carolina. Additionally, a 5% probability for a tornado within 25 miles (40 km) of a point within the same areas was highlighted. The slight risk was later upgraded to an enhanced risk as the day progressed due to various supercells that began to develop within a squall line that was shifting eastward, with much of the western part of the state being under this category by nightfall. A 10% hatched risk for tornadoes was also outlined for much of the same regions.

In the early morning of April 13, 2020, a squall line of thunderstorms traversed over southeast South Carolina ahead of a cold front. Conditions ahead of the storms were unusually unstable for the time of day and year, as moisture from the unusually warm Gulf of Mexico was pushing dewpoints into the upper 60s to 70 °F. These dew points along with strong vertical wind shear formed an unstable atmosphere that supported the development of organized thunderstorms and potentially supercells. As the squall line continued to travel into this favorable environment, several supercell thunderstorms intensified significantly as they separated from the main line of storms. These newly isolated supercells began to produce strong winds and went on to produce 28 tornadoes throughout South Carolina, the strongest of which being the Hampton County tornado.

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