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EF0 tornado in Iron County, Michigan

Tornado August 9, 2020 · Iron County, Michigan

EF0

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, Wisconsin → Florence County, Wisconsin → Iron County; 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 EF0 means. On the Enhanced Fujita scale, EF0 is light damage: shingles and siding peeled, gutters torn, branches broken, consistent with estimated gusts of 65–85 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

Tornado damage was confirmed by NWS storm survey team with numerous hardwood and softwood trees snapped off or uprooted on its path along and north of the Brule River in Iron County. Time of the damage was estimated from radar.

The wider storm

Increasing moisture and instability ahead of cold front approaching from the Northern Plains aided the development of strong to severe thunderstorms over portions of western Upper Michigan from the afternoon of the 9th into the morning of the 10th.

Began near Scott Lake (45.9899, -88.6695).

Other tornadoes from the same storm system

1 more tornado the National Weather Service filed under this storm episode.

EF1 Iron County

Source: NOAA Storm Events Database, event 915257. Narratives are written by the National Weather Service forecast office that issued the report.

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