Tornadoes · United States · Iowa
Tornadoes in Monona County, Iowa
30 tornadoes have crossed Monona County since 1950, 68th of the 99 counties in Iowa with a tornado on record, an average of one every 2.5 years. They have killed 4 people and injured 66. 1 was rated F4 or EF4 and above.
The rating scale
Tracks are drawn in the color of the rating. The United States rated tornadoes on Ted Fujita’s F scale until 31 January 2007 and on the Enhanced Fujita scale after it. Both run from 0 to 5, and both rate the damage rather than measure the wind: the speeds are what that damage is taken to imply.
F0 / EF040 to 72 mph on the F scale, 65 to 85 mph on the EF scale
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
F1 / EF173 to 112 mph on the F scale, 86 to 110 mph on the EF scale
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
F2 / EF2113 to 157 mph on the F scale, 111 to 135 mph on the EF scale
Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.
F3 / EF3158 to 206 mph on the F scale, 136 to 165 mph on the EF scale
Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.
F4 / EF4207 to 260 mph on the F scale, 166 to 200 mph on the EF scale
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
F5 / EF5261 to 318 mph on the F scale, over 200 mph on the EF scale
Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.
Unrated
The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.
Now
- Tornadoes
- 30
- Deaths
- 4
- Injuries
- 66
- F4 and above
- 1
- Worst on record
- F4, July 28, 1986
The deadliest in Monona County
The strongest
- F4, Dixon, Dakota, Woodbury and Monona counties, Nebraska and IowaJuly 28, 1986
- EF3, Harrison and Monona counties, IowaJune 11, 2008
- EF3, Monona County, IowaApril 9, 2011
- EF2, Thurston, Monona and Woodbury counties, Nebraska and IowaOctober 4, 2013
- F2, Monona and Crawford counties, IowaMay 16, 1999
- F2, Monona County, IowaSeptember 9, 1965
- F2, Monona County, IowaMay 28, 1991
- F2, Monona County, IowaJune 23, 1998
Every year with a tornado
The 18 years of the 76 in the record with a tornado in Monona County. Each year links to every tornado in Iowa that year.
Every tornado that crossed Monona County
30 tornadoes, newest first. 2 of them touched down in a neighboring state and ran in, so the record files them under that state rather than Iowa.
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|---|---|---|---|---|---|---|---|
| April 26, 2024 | 5:23 PM CDT | EF1 | Monona | 3.3 | 250 | |||
| April 26, 2024 | 5:17 PM CDT | EF0 | Monona | 1.5 | 100 | |||
| April 26, 2024 | 4:52 PM CDT | EF1 | Harrison | 9.1 | 766 | |||
| October 4, 2013 | 5:55 PM CDT | EF2 | Thurston to IA | 26.6 | 264 | 2 | $400,000 | |
| April 14, 2012 | 2:28 PM CDT | EF0 | Monona | 0.4 | 25 | |||
| June 20, 2011 | 8:45 PM CDT | EF1 | Monona | 7.1 | 300 | |||
| April 9, 2011 | 7:20 PM CDT | EF3 | Monona | 3.4 | 1,200 | 14 | ||
| June 11, 2008 | 7:20 PM CDT | EF0 | Monona | 0.3 | 60 | |||
| June 11, 2008 | 6:27 PM CDT | EF3 | Harrison | 13.0 | 440 | 4 | 48 | |
| May 29, 2008 | 8:00 PM CDT | EF1 | Monona | 3.8 | 200 | |||
| August 17, 2001 | 7:47 PM CDT | F0 | Monona | 0.2 | 30 | |||
| August 17, 2001 | 6:39 PM CDT | F0 | Monona | 4.0 | 20 | $10,000 | ||
| June 13, 2001 | 9:20 PM CDT | F0 | Monona | 0.1 | 30 | |||
| May 16, 1999 | 3:33 PM CDT | F2 | Monona | 22.5 | 90 | $620,000 | ||
| July 6, 1998 | 6:40 PM CDT | F0 | Monona | 0.1 | 50 | |||
| June 23, 1998 | 8:20 PM CDT | F0 | Monona | 2.0 | 50 | |||
| June 23, 1998 | 7:30 PM CDT | F2 | Monona | 2.0 | 50 | |||
| May 21, 1998 | 8:30 PM CDT | F0 | Monona | 0.2 | 50 | |||
| June 16, 1992 | 11:01 PM CDT | F0 | Monona | 0.1 | 20 | $50 to $500 | ||
| May 28, 1991 | 1:56 AM CDT | F2 | Monona | 5.0 | 60 | $50,000 to $500,000 | ||
| July 5, 1987 | 6:20 PM CDT | F0 | Monona | 0.2 | 13 | |||
| July 28, 1986 | 6:30 PM CDT | F4 | Dixon to IA | 52.5 | 73 | 2 | $50 million to $500 million | |
| August 15, 1977 | 5:00 PM CDT | F0 | Monona | 0.2 | 20 | |||
| June 24, 1968 | 7:35 PM GMT-5 | F0 | Monona | 0.1 | 10 | |||
| June 24, 1968 | 7:35 PM GMT-5 | F0 | Monona | 0.1 | 10 | |||
| June 8, 1967 | 10:30 PM GMT-5 | F1 | Monona | 5.1 | 300 | $5,000 to $50,000 | ||
| September 9, 1965 | 2:00 PM GMT-5 | F2 | Monona | 10.2 | 100 | $50,000 to $500,000 | ||
| September 9, 1965 | 1:30 PM GMT-5 | F1 | Monona | 1.0 | 100 | $5,000 to $50,000 | ||
| May 18, 1962 | 6:00 PM GMT-5 | F1 | Monona | 1.9 | 200 | $5,000 to $50,000 | ||
| March 21, 1953 | 1:00 PM GMT-6 | F1 | Monona | 10.9 | 600 | $5,000 to $50,000 |
Nearby
Warnings in force in Monona CountyThe forecast for Monona CountyThe live radar over Monona CountyEvery county in Iowa
What this means
Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.
Sources
NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.