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EF1 tornado in Delaware County, Oklahoma

Tornado May 24, 2011 · Delaware County, Oklahoma

EF1
Rating
7.0 mi
Path length
150 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 150 yards (0.09 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

A tornado uprooted trees and snapped large limbs. Maximum estimated wind in the tornado based on this damage was about 95 mph. At least one storm chaser witnessed this tornado.

The wider storm

Severe thunderstorms developed along a dry line over central Oklahoma during the afternoon hours. Very unstable air and strong wind shear east of the dry line supported supercell thunderstorm structures, which persisted as the storms moved into eastern Oklahoma during the evening hours. These severe storms produced tornadoes, large hail to golfball size, and very strong damaging downburst wind across much of eastern Oklahoma.

Began near Leach (36.2264, -94.9542).

Other tornadoes from the same storm system

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

EF2 Osage CountyEF2 Muskogee CountyEF2 Wagoner CountyEF2 Le Flore CountyEF1 Osage CountyEF1 Delaware CountyEF1 Latimer CountyEF1 Sequoyah CountyEF0 Le Flore County

Source: NOAA Storm Events Database, event 312948. Narratives are written by the National Weather Service forecast office that issued the report.

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