Tornado, Clarke
- When
- September 20, 6:30 PM CST
- Where
- Clarke County
- Rating
- F2
- Path length
- 3.3 mi
- Path width
- 150 yd
- Property damage
- $250,000
- Coordinates
- 41.050, -93.770
Tornadoes and Damaging Winds in Iowa, September 20, 1965
3 tornado, 2 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
- 4
- Property damage
- $750,000
- 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
3 tornado, 2 thunderstorm wind. Local standard time, as filed.
Thunderstorm Wind, Monroe
- When
- September 20, 6:45 PM CST
- Where
- Monroe County
- Coordinates
- 41.000, -92.780
Tornado, Keokuk
- When
- September 20, 7:15 PM CST
- Where
- Keokuk County
- Rating
- F3
- Path length
- 1 mi
- Path width
- 100 yd
- Injuries
- 4 direct, 0 indirect
- Property damage
- $250,000
- Coordinates
- 41.330, -92.200
Tornado, Davis
- When
- September 20, 8:00 PM CST
- Where
- Davis County
- Rating
- F2
- Path length
- 10.3 mi
- Path width
- 150 yd
- Property damage
- $250,000
- Coordinates
- 40.720, -92.600
Thunderstorm Wind, Johnson
- When
- September 20, 8:00 PM CST
- Where
- Johnson County
- Coordinates
- 41.700, -91.580
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.
- 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
- Tornadoes and Damaging Winds in Kansas, September 20, 1965
- Tornadoes and Hail in Missouri, September 20, 1965
- Tornadoes and Hail in Oklahoma, September 20, 1965
- Hail and Damaging Wind in Texas, September 20, 1965
- Damaging Wind in Michigan, September 20, 1965
- Damaging Wind in New York, September 20, 1965
- Damaging Wind in Pennsylvania, September 20, 1965
- Damaging Wind in Illinois, September 20, 1965
More
Every storm in Iowa in 1965Every state in 1965This day in weather historyThe tornado archive for Iowa, 1965
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: 10015322, 10015323, 10015324, 10015325, 10015326.