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EF1 tornado in Delaware County, Oklahoma

Tornado May 22, 2011 · Delaware County, Oklahoma

EF1
Rating
0.5 mi
Path length
100 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 100 yards (0.06 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 snapped or uprooted large trees. Maximum estimated wind in the tornado based on this damage was about 100 mph.

The wider storm

A very moist and very unstable air mass developed across eastern Oklahoma on the afternoon and evening of the 22nd as a dry line moved into the area from the west. Severe thunderstorms, including supercells, developed ahead of the dry line and moved across the area producing tornadoes, large hail up to softball size, and damaging wind gusts.

Began near West Siloam Spgs (36.1975, -94.5859).

Other tornadoes from the same storm system

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

EF3 Delaware CountyEF2 Delaware CountyEF2 Adair CountyEF2 Delaware CountyEF1 Wagoner CountyEF1 Cherokee CountyEF1 Delaware CountyEF0 Delaware CountyEF0 Cherokee County

Source: NOAA Storm Events Database, event 310297. Narratives are written by the National Weather Service forecast office that issued the report.

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