Tornado and Hail in Iowa, March 21, 1966

Name: Tornado and Hail in Iowa, March 21, 1966
Start: 1966-03-21T12:15
End: 1966-03-21T22:15
Location: Iowa

March 21, 1966 · 5 events in 4 counties and zones

4 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: $250,000
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

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

Hail, Mahaska

When: March 21, 12:15 PM CST
Where: Mahaska County
Measured: 1.5 in hail
Coordinates: 41.280, -92.680

Hail, Keokuk

When: March 21, 12:30 PM CST
Where: Keokuk County
Measured: 1.5 in hail
Coordinates: 41.380, -92.000

Tornado, Keokuk

When: March 21, 1:00 PM CST
Where: Keokuk County
Rating: F1
Path length: 1 mi
Path width: 100 yd
Property damage: $250,000
Coordinates: 41.470, -92.120

Hail, Louisa

When: March 21, 1:33 PM CST
Where: Louisa County
Measured: 2 in hail
Coordinates: 41.280, -91.400

Hail, Jackson

When: March 21, 10:15 PM CST
Where: Jackson County
Measured: 1.5 in hail
Coordinates: 42.280, -90.400

What these are

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 Iowa in 1966 Every state in 1966 This day in weather history The tornado archive for Iowa, 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: 10015329, 10015330, 10015331, 10015332, 10015333.