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EF1 tornado in Forest County, Wisconsin

Tornado August 9, 2020 · Forest County, Wisconsin

EF1
Rating
4.6 mi
Whole path
250 yd
Path width
$70K
Damage as recorded

NOAA records this tornado county by county. Its path ran through Forest County → Florence County → Iron County, Michigan; the totals above are for the whole tornado.

EF0EF1EF2EF3EF4EF5Unrated

The path drawn at its surveyed width of 250 yards (0.14 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

A tornado formed at 9:12 PM CDT in a remote forested area in extreme northeast Forest County, east of the town of Alvin. The tornado moved northeast to about 0.3 miles north of Ransdell Lake, then turned east, reaching maximum width before crossing Huff Creek Road. The tornado produced a path of tree damage (DI 27,28, DOD 3,4) before entering Florence County at 9:18 PM CDT. Peak winds were estimated at 105 mph.

The wider storm

An upper-level shortwave produced thunderstorms across north-central Wisconsin during the evening hours. Three tornadoes and wind damage was reported as these thunderstorms tracked through the area.

Began near Nelma (45.9820, -88.7410).

Other tornadoes from the same storm system

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

Source: NOAA Storm Events Database, event 908343. Narratives are written by the National Weather Service forecast office that issued the report.

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