Tornadoes and Hail in Wisconsin, March 21, 1966

Name: Tornadoes and Hail in Wisconsin, March 21, 1966
Start: 1966-03-21T18:30
End: 1966-03-21T18:58
Location: Wisconsin

March 21, 1966 · 7 events in 3 counties and zones

4 thunderstorm wind, 2 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

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 1
Property damage: $5.0 million
Crop damage: None recorded
Events: 7

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

4 thunderstorm wind, 2 tornado, 1 hail. Local standard time, as filed.

Thunderstorm Wind, Racine

When: March 21, 6:30 PM CST
Where: Racine County
Coordinates: 42.700, -88.080

Hail,

When: March 21, 6:35 PM CST
Where: County
Measured: 1 in hail
Coordinates: 42.700, -87.780

Thunderstorm Wind, Walworth

When: March 21, 6:35 PM CST
Where: Walworth County
Coordinates: 42.780, -88.580

Thunderstorm Wind, Racine

When: March 21, 6:35 PM CST
Where: Racine County
Coordinates: 42.700, -88.280

Thunderstorm Wind, Walworth

When: March 21, 6:35 PM CST
Where: Walworth County
Coordinates: 42.580, -88.580

Tornado, Walworth

When: March 21, 6:45 PM CST
Where: Walworth County
Rating: F2
Path length: 19.8 mi
Path width: 200 yd
Injuries: 1 direct, 0 indirect
Property damage: $2.5 million
Coordinates: 42.600, -88.700

Tornado, Racine

When: March 21, 6:58 PM CST
Where: Racine County
Rating: F2
Path length: 13.3 mi
Path width: 200 yd
Property damage: $2.5 million
Coordinates: 42.670, -88.320

What these are

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.
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.

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

The same day elsewhere

Every storm in Wisconsin in 1966 Every state in 1966 This day in weather history The tornado archive for Wisconsin, 1966

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: 10148331, 10148332, 10148333, 10148334, 10148335, 10148336, 10148337.