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EF1 tornado in Caddo County, Oklahoma

Tornado November 7, 2011 · Caddo County, Oklahoma

EF1
Rating
13.0 mi
Path length
400 yd
Path width
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 400 yards (0.23 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

Several storm spotters observed a tornado that moved 13 miles from southwest of Fort Cobb to Fort Cobb Lake to SW of Albert. This tornado was observed to be multiple vortex at times. Near the beginning of the tornado path, a barn and cattle pens were damaged. As the tornado approached Fort Cobb Lake, the Oklahoma Mesonet weather station just south of Fort Cobb Lake reported a wind gust of 91 mph at 5:08 pm CST before a large irrigation pivot from a nearby field knocked the instrument tower down.

The wider storm

A powerful storm system moving through the southern Great Plains produced tornadoes, large hail, damaging winds and flooding across parts of Oklahoma and western north Texas on November 7-8, 2011.

The strong storm system generated severe weather including tornadoes, large hail, damaging winds and flooding from the early afternoon of November 7th through the early morning of November 8th. Several supercell thunderstorms developed over southwest Oklahoma during the mid-afternoon hours and moved northeast. One particularly nasty supercell thunderstorm developed over northern Wilbarger county in north Texas. This thunderstorm moved northeast into Tillman county, eventually producing at least eight tornadoes over a five county area. Two of the tornadoes moved near two Oklahoma Mesonet sites, both taking direct hits. The Mesonet site at Tipton measured 86.4 mph before it was destroyed. The Mesonet site near Fort Cobb measured 91.4 mph before it was destroyed. Both sites also recorded significant drops in surface pressure. Other supercells over southwest Oklahoma eventually congealed into a complex of storms and moved east into central Oklahoma. Numerous reports of high winds (92 mph near Clinton, OK) and hail up to golf ball-size were reported. The severe threat transitioned to a heavy rain and high threat after sunset.

Began near Carnegie (35.0420, -98.5230).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 349811. Narratives are written by the National Weather Service forecast office that issued the report.

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