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EF2 tornado in Benson County, North Dakota

Tornado June 9, 2017 · Benson County, North Dakota

EF2
Rating
8.0 mi
Path length
600 yd
Path width
$200K
Damage as recorded
$10K
Crop damage
EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 600 yards (0.34 mi) — zoom in and the swath grows to true scale. Other tornadoes recorded nearby that day are shown faint.

What EF2 means. On the Enhanced Fujita scale, EF2 is considerable damage: roofs torn off well-built houses, mobile homes destroyed, large trees snapped or uprooted, consistent with estimated gusts of 111–135 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 and corresponding rear flank downdraft wind produced widespread dust, which greatly reduced the visibility. Numerous ash, poplar, cottonwood, and evergreen trees were snapped or uprooted in shelterbelts and groves along its path. Peak winds of 119 mph were measured by a mobile system.

The wider storm

During the day of June 9th, temperatures over eastern North Dakota and the northwest quarter of Minnesota topped out in the upper 70s along the Canadian border to lower 90s along the North Dakota/South Dakota border. Mid level temperatures were very warm over the central Dakotas, helping to suppress convective development until early evening. By that point, thunderstorms broke out over southern Manitoba down through central North Dakota, mainly along a cold front. These storms tracked east-southeast, mainly covering the Devils Lake region, down through the central Red River Valley, and into the Mahnomen to Hubbard county corridor. A mix of tornadoes, hail, and strong winds were reported.

Began near Knox (48.2600, -99.7400).

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 696852. Narratives are written by the National Weather Service forecast office that issued the report.

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