Tornadoes and Hail in Iowa, August 12, 1974

Name: Tornadoes and Hail in Iowa, August 12, 1974
Start: 1974-08-12T16:20
End: 1974-08-12T19:15
Location: Iowa

August 12, 1974 · 3 events in 3 counties and zones

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

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The toll

Deaths: 0
Injuries: 14
Property damage: $2.8 million
Crop damage: None recorded
Events: 3

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

2 tornado, 1 hail. Local standard time, as filed.

Tornado, Delaware

When: August 12, 4:20 PM CST
Where: Delaware County
Rating: F4
Path length: 5 mi
Path width: 400 yd
Injuries: 12 direct, 0 indirect
Property damage: $2.5 million
Coordinates: 42.350, -91.480

Hail, Linn

When: August 12, 5:45 PM CST
Where: Linn County
Measured: 1 in hail
Coordinates: 42.000, -91.680

Tornado, Iowa

When: August 12, 7:15 PM CST
Where: Iowa County
Rating: F4
Path length: 2 mi
Path width: 100 yd
Injuries: 2 direct, 0 indirect
Property damage: $250,000
Coordinates: 41.750, -92.180

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.
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 Iowa in 1974 Every state in 1974 This day in weather history The tornado archive for Iowa, 1974

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: 10014572, 10014573, 10014574.