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EF1 tornado in Iron County, Michigan

Tornado August 9, 2020 · Iron County, Michigan

EF1

Rating

3.8 mi

Path length

250 yd

Path width

$100K

Damage as recorded

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

At least 50 to 100 healthy softwood and hardwood trees were snapped and uprooted on both sides of the road where NWS personnel has access to the path. The tornado, with estimated wind speed of 105 mph, started at Peavy Pond Road and took a path over the northern end of Peavy Pond. Damage could be seen where the tornado moved back onshore and across a small island.

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 Crystal Falls Iron C (46.0242, -88.2304).

Other tornadoes from the same storm system

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

EF1 Florence County

Source: NOAA Storm Events Database, event 914976. Narratives are written by the National Weather Service forecast office that issued the report.

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