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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 and surrounding areas at 6:10 p.m. CDT.
Radar image showing the supercell and hook echo of the storm that produced the Smithville tornado. The environmental conditions leading up to the April 2011 Super Outbreak were among the "most conducive to violent tornadoes ever documented". [2] On April 25, a vigorous upper-level shortwave trough moved into the Southern Plains states. [3]
Radar reflectivity and velocity image of the supercell that produced the tornado at 22:10 UTC (5:12 p.m. CDT) as it struck Tuscaloosa, with a debris ball clearly visible. The University of Alabama shut down its campus briefly during the course of the storm itself, resuming regular activities within minutes.
Seven tornadoes–the Vilonia tornado on April 25 and six tornadoes on April 27–stayed on the ground for over an hour. The long-track Mississippi–Alabama EF4 tornado was down from 2 hours, 53 minutes, the longest duration for a tornado in the outbreak.
The 2011 Philadelphia, Mississippi tornado was an extremely powerful and fast-moving multi-vortex tornado that touched down in eastern Mississippi on the afternoon of April 27, 2011. Part of the historic 2011 Super Outbreak , the largest tornado outbreak on record, this was the first of four EF5 tornadoes to touch down that day and the first ...
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.
NSSL: On-Demand is a web-based tool based on WDSS-II that helps confirm when and where severe weather occurred by mapping radar-detected circulations or hail on Google Earth satellite images. National Weather Service (NWS) forecast offices, including those affected by the 2011 Super Outbreak, use the images to plan post event damage surveys ...
Clockwise from top: A view of Joplin, Missouri 10 days after being hit by a catastrophic EF5 tornado; Damage caused by a strong EF4 tornado on April 27; A destroyed house in Smithville, Mississippi after a fast-moving EF5 tornado; A long-tracked tornado seen on a tower cam; An EF5 tornado seen taking the appearance of a "wedge"; A powerful tornado at EF5 intensity after exiting the town of ...