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EF1 tornado in Red River Parish, Louisiana

Tornado April 26, 2011 · Red River Parish, Louisiana

EF1
Rating
3.5 mi
Path length
125 yd
Path width
$150K
Damage as recorded
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 125 yards (0.07 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

The National Weather Service conduced a storm survey in Red River Parish near Hall Summit and concluded that damage was the result of an EF1 tornado. A couple barns were destroyed west of town north of State Route 514. Several homes in town sustained minor to moderate roof damage. The tornado crossed 514 east of Hall Summit where numerous trees were snapped onto the road. The tornado continued east crossing 371 knocking over a few trees before lifting east of 371. A sheriff deputy witnessed the tornado crossing the highway east of Hall Summitt and was blocked in from falling trees. Maximum winds were estimated at 85-90 mph.

The wider storm

A very volatile atmosphere developed during the late afternoon...evening and overnight hours of April 26th across the Four State Region. An area of low pressure moved from the Texas Hill Country into Northeast Texas during the afternoon. Meanwhile, a warm front had moved northward from central Louisiana and was oriented west to east near the Arkansas/Louisiana state line. A dry line had moved just east of the I-35 corridor of North Central Texas and a strong cold front trailed the dry line. Very strong speed and directional shear was noted in the low and mid levels of the atmosphere such that supercells developed. Many of these produced tornadoes across the region. Other storms produced strong straight line wind gusts with bowing segments and large hail.

Began near Hall Summit (32.1878, -93.3254).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 291389. Narratives are written by the National Weather Service forecast office that issued the report.

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