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EF1 tornado in Washington County, Oklahoma

Tornado April 14, 2011 · Washington County, Oklahoma

EF1
Rating
1.6 mi
Whole path
125 yd
Path width
$20K
Damage as recorded

NOAA records this tornado county by county. Its path ran through Washington County → Nowata County; the totals above are for the whole tornado.

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

This is the first of two segments of this tornado. In Washington County, this tornado uprooted several trees. Maximum estimated wind in the tornado based on this damage was 95 mph. The tornado continued into Nowata County, Oklahoma.

The wider storm

Low pressure was centered over southern Kansas during the early afternoon of the 14th with a sharp dryline extending from the low pressure system through central Oklahoma. A moist and very unstable air mass was in place across eastern Oklahoma ahead of the dryline. Severe thunderstorms developed along the dryline during the afternoon and moved into eastern Oklahoma during the early evening hours. Large hail up to grapefruit size, damaging wind gusts, and numerous tornadoes occurred as the storms moved through the region.

Began near Dewey (36.7645, -95.8126).

Other tornadoes from the same storm system

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

EF2 Osage CountyEF2 Delaware CountyEF2 Pushmataha CountyEF1 Okfuskee CountyEF1 Pittsburg CountyEF1 Pushmataha CountyEF1 Wagoner CountyEF1 Latimer CountyEF1 Pushmataha CountyEF1 Pushmataha CountyEF1 Le Flore CountyEF1 Le Flore CountyEF0 Osage CountyEF0 Okfuskee CountyEF0 Washington CountyEF0 Washington CountyEF0 Okfuskee CountyEF0 Latimer County

Source: NOAA Storm Events Database, event 302781. Narratives are written by the National Weather Service forecast office that issued the report.

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