![]() Due to the combination of rich low-level moisture, strong shear, and focused large-scale ascent, there was relatively high confidence across the outlined area for strong tornadoes – a tornado rated EF2 or higher on the Enhanced Fujita scale – and widespread damaging winds. Two days before the event, on April 25, the SPC issued a moderate risk of severe weather encompassing portions of central and eastern Kentucky, middle and eastern Tennessee, northeast Mississippi, central and northern Alabama, and northwest Georgia. As a shortwave trough tracked across portions of the Mid-South and southeastern United States, moderate instability and strong wind shear ahead of a trailing cold front was expected to promote the development of supercell thunderstorms capable of producing tornadoes, large hail, and damaging winds. On April 23, the Storm Prediction Center (SPC) began monitoring the potential for a substantial severe weather outbreak in the extended range. Meteorological synopsis Day 1 convective outlook on April 27, 2011. This was the third tornado to strike the city of Tuscaloosa in the past decade, and the second in two weeks. It then went on to impact parts of Birmingham at high-end EF4 intensity before dissipating. The tornado reached a maximum path width of 1.5 miles (2.4 km) during its track through Tuscaloosa, and once again when it crossed I-65 north of Birmingham, and attained estimated winds of 190 mph (310 km/h) shortly after passing through the city. It was one of the 360 tornadoes in the 2011 Super Outbreak, the largest tornado outbreak in United States history. It is one of the costliest tornadoes on record. Part of the 2011 Super Outbreak and Tornadoes of 2011Ī violent, high-end EF4 multiple-vortex tornado destroyed portions of Tuscaloosa and Birmingham, Alabama, as well as smaller communities and rural areas between the two cities, during the late afternoon and early evening of April 27, 2011. ![]() ![]() ![]() Tuscaloosa to Birmingham, Alabama, United States A flattened residence in Concord, Alabama after the EF4 tornadoĪpril 27, 2011, 4:43 p.m. ![]()
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