Tornado and Hail in Wisconsin, September 21, 1970

Name: Tornado and Hail in Wisconsin, September 21, 1970
Start: 1970-09-21T04:00
End: 1970-09-21T06:00
Location: Wisconsin

September 21, 1970 · 5 events in 4 counties and zones

3 thunderstorm wind, 1 tornado, 1 hail, as filed by the National Weather Service.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

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The toll

Deaths: 0
Injuries: 0
Property damage: $3,000
Crop damage: None recorded
Events: 5

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

Event by event

3 thunderstorm wind, 1 tornado, 1 hail. Local standard time, as filed.

Tornado, Eau Claire

When: September 21, 4:00 AM CST
Where: Eau Claire County
Rating: F2
Path length: 2 mi
Path width: 100 yd
Property damage: $3,000
Coordinates: 44.700, -91.220

Thunderstorm Wind, Chippewa

When: September 21, 4:01 AM CST
Where: Chippewa County
Measured: 63 kt (72 mph)
Coordinates: 44.880, -91.500

Hail, Chippewa

When: September 21, 4:20 AM CST
Where: Chippewa County
Measured: 0.75 in hail
Coordinates: 44.880, -91.500

Thunderstorm Wind, Oneida

When: September 21, 5:45 AM CST
Where: Oneida County
Measured: 100 kt (115 mph)
Coordinates: 45.580, -89.400

Thunderstorm Wind,

When: September 21, 6:00 AM CST
Where: County
Coordinates: 45.080, -89.180

What these are

Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Wisconsin in 1970 Every state in 1970 This day in weather history The tornado archive for Wisconsin, 1970

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 10147608, 10147609, 10147610, 10147611, 10147612.