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EF1 tornado in Walsh County, North Dakota

Tornado August 26, 2007 · Walsh County, North Dakota

EF1
Rating
5.5 mi
Whole path
100 yd
Path width

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

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

This tornado originated at 620 pm CST about 5 miles west-southwest of Crystal in Pembina County. It crossed into Walsh County and dissipated about 1.5 miles west of Hoople. The total tornado track was about 5 miles, and about 2 miles of the total occurred in Walsh County. This tornado was produced by the same parent supercell thunderstorm that produced the first tornado that tracked from near Union (Cavalier County) to near Garder (Pembina County). The tornado made numerous strikes in shelterbelts along its path. Peak winds were estimated at 90 mph.

The wider storm

A cold front moved across North Dakota on the 26th, with a hot and humid airmass in place ahead of the front. At 6 pm CST, a surface low was located over southern Manitoba (Canada), just north of Pembina, ND. The cold front stretched to the southwest, back toward Devils Lake (ND) and Bismarck (ND). Ahead of the cold front, temperatures ranged in the low to mid 80s with dew points around 70F. Behind the front, temperatures did not cool significantly, but dew points dropped to the mid 40s. Thunderstorms began to form along and ahead of the cold front by early evening (from northeast ND into south central ND), eventually crossing into northwest Minnesota several hours later. Eight distinct tornadoes occurred over northeast North Dakota and northwest Minnesota during this event.

Began near Hoople (48.5300, -97.6955).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 48697. Narratives are written by the National Weather Service forecast office that issued the report.

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