Thunderstorm Wind, Polk
- When
- July 21, 6:30 PM CST
- Where
- Polk County
- Coordinates
- 41.600, -93.620
Damaging Winds in Iowa, July 21, 1974
5 thunderstorm wind, 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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- 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
5 thunderstorm wind. Local standard time, as filed.
Thunderstorm Wind, Black Hawk
- When
- July 21, 7:30 PM CST
- Where
- Black Hawk County
- Coordinates
- 42.500, -92.350
Thunderstorm Wind, Black Hawk
- When
- July 21, 8:00 PM CST
- Where
- Black Hawk County
- Coordinates
- 42.520, -92.450
Thunderstorm Wind, Grundy
- When
- July 21, 8:30 PM CST
- Where
- Grundy County
- Coordinates
- 42.330, -92.530
Thunderstorm Wind, Wapello
- When
- July 21, 9:23 PM CST
- Where
- Wapello County
- Measured
- 63 kt (72 mph)
- Coordinates
- 41.100, -92.450
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.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Damaging Winds in Missouri, July 21, 1974
- Hail and Damaging Wind in Florida, July 21, 1974
- Damaging Winds in South Dakota, July 21, 1974
- Damaging Wind in Arkansas, July 21, 1974
- Hail in North Dakota, July 21, 1974
- Hail in Colorado, July 21, 1974
- Damaging Wind in Arizona, July 21, 1974
- Damaging Wind in Illinois, July 21, 1974
More
Every storm in Iowa in 1974Every state in 1974This day in weather history
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: 10014557, 10014558, 10014559, 10014560, 10014561.