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The Storm Prediction Center (SPC)'s forecast for April 27, with a high risk area within the Southern U.S. Significant severe weather was ongoing early on April 27 (in the overnight hours) and continued for the entire calendar day virtually unbroken.
Radar loop showing storm development and path. At around 5:45 p.m. CDT on the evening of April 27, the supercell thunderstorm began to re-intensify in northeastern Alabama. Initially, a severe thunderstorm warning was issued for the region, before a tornado warning was issued for the Lakeview community
This radar imagery of the Hackleburg-Phil Campbell EF5 tornado on April 27, 2011 during the 2011 Super Outbreak as it was approaching the town of Tanner, Alabama. Note the debris ball evident of a violent tornado in progress.
On the afternoon of April 27, 2011, a large, long-tracked, and powerful multi-vortex tornado moved across north-central Alabama, in the U.S., striking numerous towns along its 47-mile (76 km) track, including Cullman, Fairview, Arab and Ruth. The tornado killed 6, injured over 40, and impacted hundreds of structures.
By the morning of April 27, the SPC upgraded to a high risk of severe weather, [4] noting that a dangerous tornado outbreak capable of producing several violent – EF4 tornado or stronger on the Enhanced Fujita scale – and long-track tornadoes was expected. [5] [6]
Convective mesoscale discussions are issued by the National Oceanic and Atmospheric Administration’s Storm Prediction Center based on the National Weather Center in Norman, Oklahoma. [ 1 ] [ 2 ] One type of mesoscale discussion is a meso-gamma mesoscale discussion , which are for tornadoes believed to be at least EF2 on the Enhanced Fujita ...
A National Weather Service technician monitors Hurricane Carla on a WSR-57 radar on Sept. 10, 1961. (NOAA) For more than 60 years, Hurricane Carla has been the benchmark for landfalling hurricanes ...
An area of low pressure consolidated over Texas on April 26 and traveled east while the aforementioned shortwave trough traversed the Mississippi and Ohio River valleys. [4] Another 50 tornadoes touched down on this day. [2] The multi-day outbreak culminated on April 27 with the most violent day of tornadic activity since the 1974 Super Outbreak.