Tornadoes · United States · Iowa
Tornadoes in Osceola County, Iowa
31 tornadoes have crossed Osceola County since 1950, 62nd of the 99 counties in Iowa with a tornado on record, an average of one every 2.5 years. They have killed 0 people and injured 19. 1 was rated F4 or EF4 and above. Before 1950, Grazulis's record of significant tornadoes has 4 more crossing the county, back to 1895.
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
- 31
- Deaths
- 0
- Injuries
- 19
- F4 and above
- 1
- Worst on record
- EF4, June 25, 2010
The strongest
- EF4 Sibley–Little Rock tornado, IowaJune 25, 2010
- F3, O'Brien, Osceola, Dickinson and Jackson counties, Iowa and MinnesotaMay 31, 1971
- F3, Osceola County, IowaMay 31, 1971
- F3, Osceola County, IowaAugust 7, 1994
- F2, Osceola and Dickinson counties, IowaJune 14, 1981
- F2, O'Brien and Osceola counties, IowaMay 5, 1965
- F2, Osceola and Dickinson counties, IowaJune 14, 1981
- F2, Osceola and Lyon counties, IowaJune 7, 1993
- EF2, Osceola County, IowaAugust 18, 2017
- F2, Osceola County, IowaMay 8, 1964
Every year with a tornado
The 19 years of the 76 in the record with a tornado in Osceola County. Each year links to every tornado in Iowa that year.
Every tornado that crossed Osceola County
31 tornadoes, newest first.
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|---|---|---|---|---|---|---|---|
| August 20, 2021 | 3:34 PM CDT | EF0 | Osceola | 3.6 | 30 | $30,000 | ||
| August 8, 2021 | 4:47 PM CDT | EF0 | Osceola | 2.4 | 50 | $10,000 | ||
| August 8, 2021 | 4:36 PM CDT | Unrated | Osceola | 0.8 | 40 | |||
| August 18, 2017 | 8:07 PM CDT | EF2 | Osceola | 5.1 | 250 | $300,000 | ||
| August 18, 2017 | 7:47 PM CDT | EF1 | Osceola | 1.6 | 100 | |||
| May 11, 2011 | 7:07 PM CDT | EF0 | Osceola | 0.5 | 50 | |||
| June 26, 2010 | 8:15 PM CDT | EF0 | Osceola | 0.1 | 50 | |||
| June 26, 2010 | 8:12 PM CDT | EF0 | Osceola | 0.1 | 50 | |||
| June 25, 2010 | 10:45 PM CDT | EF0 | Osceola | 0.2 | 50 | |||
| June 25, 2010 | 9:53 PM CDT | EF4 | Sibley–Little Rock tornado | 13.7 | 800 | 13 | $3.5 million | |
| June 11, 2008 | 5:29 PM CDT | EF0 | Osceola | 0.8 | 50 | |||
| May 1, 2008 | 8:05 PM CDT | EF0 | Osceola | 0.1 | 50 | |||
| June 13, 2001 | 8:52 PM CDT | F0 | Osceola | 0.1 | 50 | |||
| June 12, 2001 | 9:45 PM CDT | F0 | Osceola | 0.1 | 50 | |||
| July 11, 2000 | 8:36 PM CDT | F0 | Osceola | 0.1 | 50 | |||
| June 27, 1998 | 4:45 PM CDT | F1 | Osceola | 4.0 | 100 | $500,000 | ||
| August 7, 1994 | 9:16 PM CDT | F3 | Osceola | 4.5 | 73 | 1 | $50,000 to $500,000 | |
| June 12, 1994 | 6:58 PM CDT | F0 | Osceola | 0.1 | 23 | $500 to $5,000 | ||
| June 29, 1993 | 3:31 PM CDT | F0 | Osceola | 0.2 | 23 | $50 to $500 | ||
| June 7, 1993 | 6:41 PM CDT | F2 | Osceola | 10.0 | 127 | 5 | $5,000 to $50,000 | |
| June 2, 1991 | 5:25 PM CDT | F0 | Osceola | 0.1 | 13 | $50 to $500 | ||
| June 6, 1982 | 4:00 PM CDT | F2 | Osceola | 2.0 | 67 | $500,000 to $5 million | ||
| June 14, 1981 | 5:00 AM CDT | F2 | Osceola | 21.6 | 1,533 | $500,000 to $5 million | ||
| June 14, 1981 | 5:00 AM CDT | F2 | Osceola | 21.9 | 1,533 | $500,000 to $5 million | ||
| August 19, 1979 | 5:30 PM CDT | F0 | Osceola | 0.2 | 30 | $500 to $5,000 | ||
| May 31, 1971 | 2:20 PM CDT | F3 | Osceola | 8.6 | 250 | $50,000 to $500,000 | ||
| May 31, 1971 | 2:15 PM CDT | F3 | O'Brien to MN | 46.5 | 100 | $50,000 to $500,000 | ||
| June 13, 1968 | 6:50 PM GMT-5 | F2 | Osceola | 0.1 | 200 | $50,000 to $500,000 | ||
| July 9, 1966 | 4:30 AM GMT-5 | F2 | Osceola | 1.0 | 200 | $5,000 to $50,000 | ||
| May 5, 1965 | 3:30 PM GMT-5 | F2 | O'Brien | 21.8 | 10 | $500 to $5,000 | ||
| May 8, 1964 | 1:35 PM GMT-5 | F2 | Osceola | 5.1 | 200 | $5,000 to $50,000 |
Osceola County before 1950
Before 1950 the record is Thomas P. Grazulis’s list of significant tornadoes: those rated F2 or stronger, and weaker ones that killed somebody. 4 of them crossed Osceola County, killing 4. They are not in the figures above, which are SPC's from 1950.
| Date | Time | Rating | Where | Path (mi) | Width (yd) | Deaths | Injuries | Damage |
|---|---|---|---|---|---|---|---|---|
| May 30, 1942 | 5:45 PM CST | F3 | W Lake Park, IA to Jackson County, MN | 19.9 | 600 | |||
| May 17, 1931 | 5:30 PM CST | F2 | Ruth Lake, IA/E Lakefield, MN | 29.2 | 1 | |||
| June 5, 1914 | 6:00 PM CST | F3 | NE Archer/SE Sheldon/Sanborn/S Melvin, IA | 11.1 | 200 | 3 | 20 | |
| May 3, 1895 | 4:00 PM CST | F3 | W Ashton to S Sibley, IA | 6.5 | 200 | 1 | 1 |
About the record before 1950
- Significant tornadoes only
- Grazulis listed tornadoes rated F2 or stronger, and weaker ones that killed somebody. Most tornadoes are weaker than F2, so the list holds a fraction of the tornadoes that happened.
- The early years are thin
- A tornado is on record only where somebody saw it and wrote it down. The count rises through the 1800s with settlement and newspapers, not with the weather.
- Rated from accounts
- Grazulis rated each tornado decades later from newspaper reports, Weather Bureau records and local histories, not from a damage survey.
- The tracks are reconstructed
- Tornado Archive drew each path through the places Grazulis names, most often as a straight line from the first to the last. A track can miss a town it hit, and a tornado with one named place is a point. The counties are today’s.
- A separate record
- SPC’s database, from 1950, counts every confirmed tornado of any strength. The two are kept apart on every page and never added together.
Nearby
Warnings in force in Osceola CountyThe forecast for Osceola CountyThe live radar over Osceola 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. Before 1950: Thomas P. Grazulis, Significant Tornadoes 1680-1991 and Significant Tornadoes 1880-1989, as digitized by Tornado Archive (Maas and others, 2024). Public domain. Counties assigned by this site from today’s NWS county lines.