Tornado and Hail in Iowa, May 23, 1964

Name: Tornado and Hail in Iowa, May 23, 1964
Start: 1964-05-23T17:00
End: 1964-05-23T22:45
Location: Iowa

May 23, 1964 · 6 events in 6 counties and zones

4 thunderstorm wind, 1 hail, 1 tornado, 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: $25,000
Crop damage: None recorded
Events: 6

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

Hail, Harrison

When: May 23, 5:00 PM CST
Where: Harrison County
Measured: 1.75 in hail
Coordinates: 41.580, -95.780

Thunderstorm Wind, Guthrie

When: May 23, 8:30 PM CST
Where: Guthrie County
Coordinates: 41.780, -94.580

Thunderstorm Wind, Greene

When: May 23, 9:00 PM CST
Where: Greene County
Coordinates: 41.880, -94.500

Thunderstorm Wind, Dallas

When: May 23, 9:30 PM CST
Where: Dallas County
Coordinates: 41.700, -94.080

Tornado, Franklin

When: May 23, 10:00 PM CST
Where: Franklin County
Rating: F0
Path width: 33 yd
Property damage: $25,000
Coordinates: 42.750, -93.250

Thunderstorm Wind, Polk

When: May 23, 10:45 PM CST
Where: Polk County
Measured: 53 kt (61 mph)
Coordinates: 41.500, -93.680

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
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.
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 Iowa in 1964 Every state in 1964 This day in weather history The tornado archive for Iowa, 1964

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: 10012171, 10012172, 10012173, 10012174, 10012175, 10012176.