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EF3 tornado in Grady County, Oklahoma

Tornado May 24, 2011 · Grady County, Oklahoma

EF3
Rating
23.1 mi
Whole path
880 yd
Path width
61
Injuries

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

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 880 yards (0.50 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF3 means. On the Enhanced Fujita scale, EF3 is severe damage: whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, consistent with estimated gusts of 136–165 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 tornado is labeled D1 (Segment #1 of the Washington-Goldsby tornado). This tornado developed west of Bradley, downing tree limbs as it moved northeast. The tornado began to increase in intensity, producing EF-3 damage, as it approached McClain county. Although the damage was confined to trees, the severity of the damage became more intense. Trees were snapped at the bases, or debarked altogether. The tornado was several hundred yards wide as it neared the county line. Luckily, very few structures were in the path. This tornado continued into McClain County. Monetary damage estimates were not available.

The wider storm

A tornado outbreak occurred over parts of northern and central Oklahoma during the day on the 24th, with violent tornadoes devastating several communities. By the end of the day, one EF-5, two EF-4, and two EF-3 tornadoes destroyed buildings, ripped up trees and power poles, and unfortunately, resulted in 11 deaths. The day began with a strong upper level trough ejecting out of the southwest United States. The trough took on a negative tilt as it approached the southern Plains. A strong jet stream was located at both the middle and upper levels rotating around the upper trough. At the surface, a low pressure strengthened rapidly over northwest Oklahoma, keeping the low-level flow of warm, moist air to flow east of a dry line that had moved into western Oklahoma. Thunderstorms developed by early afternoon over western Oklahoma, and quickly became supercellular as they moved northeast. Strong low-level rotation developed early, with the first tornado occurring over Blaine county, and moved northeast into Major county. Another supercell rapidly gained low-level rotation as it moved from Caddo into Canadian County. This tornado became the strongest of them all as it moved north of El Reno, west of Piedmont, and to south of Guthrie in Logan county. Nine people died as a result of this tornado. Two more powerful supercells developed over Grady county, and they moved northeast into McClain and Cleveland counties. Finally, the final tornado occurred east of Norman into Pottawatomie county. The timing of this outbreak could not have come at a worse time, as rush hour was just unfolding as the tornadoes neared the Oklahoma City metro area.

Began near Bradley (34.8800, -97.7320).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 315869. Narratives are written by the National Weather Service forecast office that issued the report.

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