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EF1 tornado in Walker County, Alabama

Tornado April 11, 2013 · Walker County, Alabama

EF1
Rating
5.5 mi
Path length
500 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 500 yards (0.28 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF1 means. On the Enhanced Fujita scale, EF1 is moderate damage: roofs badly stripped, mobile homes pushed off foundations or overturned, windows broken, consistent with estimated gusts of 86–110 mph. The rating comes from a survey of the worst damage after the storm, not from a wind measurement, so it says as much about what the tornado hit as about how strong it was.

What the National Weather Service wrote

National Weather Service meteorologists surveyed the damage in northwest Walker County and have determined that the damage was due to an EF-1 tornado, with maximum winds of 86 mph. The tornado touched down approximately 3/4 of a mile southwest of Dogtown Road, near Seamore Mountain, in the Mill Creek watershed. The tornado tracked northeast and crossed Dogtown Road where it uprooted several trees. The tornado continued northeast and crossed Highway 78 and Ritter Road, where the most significant damage occurred. Dozens of trees were uprooted and one single family home had portions of its roof and roof decking removed. The tornado continued northeast and crossed Nix Road, Nauvoo Road, Jagger Road, Johnson Road, and Slick Lizzard Road. Some minor structural damage was observed along these roads along with tree damage. The tornado finally lifted northeast of Slick Lizzard Road before it crossed Highway 5. This damage could not be linked to the tornado in southern Winston County at Poplar Springs.

The wider storm

Severe thunderstorms ahead of and along a cold front moved across Central Alabama on Thursday, April 11th. Storms along the cold front formed into a quasi-linear convective system, causing wind damage and producing seven tornadoes across the area. Ahead of the line, strong daytime heating and increasing instabilities coupled with strong diffluence aloft created prime conditions for discrete thunderstorms to form. These storms caused wind damage across portions of northeast Central Alabama during the late afternoon.

Began near Kansas (33.9197, -87.5361).

Other tornadoes from the same storm system

6 more tornadoes the National Weather Service filed under this storm episode.

Source: NOAA Storm Events Database, event 449838. Narratives are written by the National Weather Service forecast office that issued the report.

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