Harrison County, Iowa
Tornadoes, hail, floods and severe storms recorded here between 1959 and 2026, from NOAA's Storm Events Database. Search an address to see which tornadoes came closest to it.
34
Tornado reports
218
Hail reports
31
Floods since 1996
698
All events
2
Deaths
$40.8M
Property damage
Tornado paths in Harrison County
The part of each tornado’s path NOAA recorded in this county, 34 in all. Zoom in and the paths widen to their surveyed width.
EF0EF1EF2EF3EF4EF5Unrated
Year by year
All storm eventsTornadoes
NOAA's storm database records tornadoes back to 1950 and hail and thunderstorm wind back to 1955, but floods only from 1996 on. Older floods are missing here. For those, the U.S. Geological Survey's stream gauge records and flood reports are the place to look.
Most significant events
The strongest tornadoes, deadliest events and biggest damage here, up to 50.
Tornado F3 Tornado
The smaller of 2 strong tornadoes that hit Harrison county the afternoon of 5/16/99. This one destroyed a home west of Logan before it weakened, it then made a loop back to the northwest before dissipating.
The stronger of the 2 tornadoes that ripped through Harrison county the afternoon of 5/16/99 killed 2 people and destroyed 6 homes and a bridge before it dissipated a couple of miles east of Logan. A family of 5 leaving a high school graduation party encountered the tornado on a …
Thiere was for flooding along the Boyer River. The river gauge at Logan, operated by the USGS, peaked at 25.33 feet at 7 pm on March 13th. Major flood stage is 25 feet. Preliminary information shows this peak is the highest on record. Portions of the town of Missouri Valley flood…
Flooding along the Missouri River gradually worsened over the area during June and July and continued into August as record releases from Gavins Point Dam brought widespread flooding along the River. The river near Blair climbed to a little under 33 feet by the end of June, flood…
Rainfall of 5 inches fell across the Missouri Valley area Saturday May 5th prompting the levee along Willow Creek to eventually fail causing substantial flash flooding in and around the Missouri Valley area. Initally flash flooding was observed due to the heavy rain Saturday even…
Heat Heat
A Citizen Weather Observer Program (CWOP) station recorded minimum temperatures above 75 degrees for at least 48 hours, paired with daily maximum heat index values peaking between 105 and 107 degrees.
Hail Hail
Law enforcement report of hail estimated up to 1.00 inch in diameter.
Thunderstorm Wind Thunderstorm Wind
Personal weather station measured wind gust of 65 mph.
Hail Hail
Public report of hail measured up to 1 inch in diameter in Modale, IA.
Hail Hail
Delayed public report via social media of hail up to ping pong ball sized. Time estimated with radar.
Hail Hail
Delayed report from a trained storm spotter of approximately half dollar size hail 4 miles west of Pisgah. Time estimated with radar.
Hail Hail
Public report of hail estimated up to 1 inch in diameter in Logan, IA.
Hail Hail
Emergency dispatch relayed report of quarter size hail near 335th and Mounds Trail.
Hail Hail
Local business reported approximately quarter size hail in Dunlap, IA.
Hail Hail
Public report of hail estimated up to 1 inch in diameter in Logan, IA. Reported received via social media video.
Hail Hail
Delayed report received via social media of hail measured up to 1 inch in diameter mixed with a lot of nickel sized hailstones from a Trained Spotter. Time estimated with radar.
Hail Hail
Delayed public report received via social media of hail estimated up to quarter sized. Time estimated with radar.
Tornado EF1 Tornado
A tornado developed approximately 1.5 miles north-northwest of Little Sioux, IA at 12:46 PM CST. The tornado began just southeast of the intersection of 120th Street and Dayton Avenue, before flipping a center pivot. It continued northeast, damaging farm outbuildings, trees, and …
Hail Hail
Public report of hail estimated at 1.50 inches in diameter.
Hail Hail
Trained spotter report of hail estimated at 1.00 inch in diameter.
Hail Hail
Public report of hail estimated at 1.75 inches in diameter.
Hail Hail
Emergency management report of hail estimated at 1.75 inches in diameter.
Hail Hail
Trained spotter report of hail estimated at 1.75 inches in diameter with all windows broken on the west side of a home.
High Wind High Wind
No observations within the county. Estimated maximum wind gusts of 58 mph based on surrounding observations.
Winter Storm Winter Storm
The office received snowfall reports of 6 to 7 inches from both the public and CoCoRaHS observers, with the heaviest amounts estimated along the southern edge of the county. Wind gusts of 23 to 26 mph, combined with the heavy snowfall, reduced visibility to around one-quarter mil…
Extreme Cold/Wind Chill Extreme Cold/Wind Chill
Mesonet measured wind chill temperature as low as 35 degrees below zero.
High Wind High Wind
Personal weather station measured wind gust of 57 mph near Woodbine, IA. Personal weather station measured gust of 61 mph just north of the county line.
High Wind High Wind
No observations within the county. Estimated maximum wind gusts of 58-60 mph based on surrounding observations.
High Wind High Wind
Personal weather station measured wind gust of 64 mph near Woodbine, IA. Additional personal weather station measured wind gusts include 58 near Persia and Missouri Valley, IA, 59 mph near Logan, IA and 60 mph near Missouri Valley. IA.
Winter Storm Winter Storm
While the office did not receive snowfall reports in the county, surrounding reports estimated 5.5 to 6.5 inches in the county. The heaviest snowfall was estimated around the eastern edge of the county.
Hail Hail
Public report of hail estimated up to 1.00 inches in diameter. Report received via mPING.
Thunderstorm Wind Thunderstorm Wind
A damaging wind event tracked across Harrison County, Iowa, during the morning of August 9th, 2025. The storm swept across the county, producing a number of strong measured wind gusts, peaking at 76 miles per hour in Missouri Valley. Other significant measured gusts were 66 miles…
Thunderstorm Wind Thunderstorm Wind
Law enforcement report of a roof blown off a home, associated with estimated 50-60 mph winds with a thunderstorm outflow boundary.
Excessive Heat Excessive Heat
Personal weather station measured heat index of 116 and 119 degrees.
Excessive Heat Excessive Heat
Personal weather station measured heat index of 108, 112 and 113 degrees.
Blizzard Blizzard
Highway 44 closed across much of Shelby and Harrison counties due to blizzard conditions. Generally 3 to 7 of snow with wind gusts measured up to 73 mph.
High Wind High Wind
Mesonet station RLSI4 measured gust of 73 mph.
Thunderstorm Wind Thunderstorm Wind
Measured wind gust of 61 mph by two separate personal weather stations.
Blizzard Blizzard
Public reports of 3 to 4 inches if snow in the western part of the county with an estimated 5 inches in the eastern part of the county. While there are no ASOS/AWOS stations within the county, surrounding sites reported 1/4 mile visibility. Wind gusts up to 52 mph.
High Wind High Wind
Mesonet measured 58 mph gust.
Extreme Cold/Wind Chill Extreme Cold/Wind Chill
Wind chill got as low as -30 in the county.
Extreme Cold/Wind Chill Extreme Cold/Wind Chill
Wind chill got as low as -35 in the county.
High Wind High Wind
Though no direct measurements were made in the county of severe level wind gusts, observations from surrounding counties support the high likelihood of wind gusts up to 60 mph occurring the afternoon of the 19th.
Excessive Heat Excessive Heat
Mesonet sites across the county measured peak heat indices ranging from 110 to 125 degrees.
Thunderstorm Wind Thunderstorm Wind
A mesonet station recorded a 58 miles per hour wind gust.
Thunderstorm Wind Thunderstorm Wind
A mesonet station recorded a 69 miles per hour wind gust.
Thunderstorm Wind Thunderstorm Wind
A 58 miles per hour wind gust was measured on a personal weather station. Severe winds at this location persisted for almost 20 minutes, with a 58 miles per hour wind gust also being recorded on a mesonet station 17 minutes later.
Events by year, as a table
| Year | Events | Tornadoes |
|---|---|---|
| 2026 | 22 | 1 |
| 2025 | 15 | 0 |
| 2024 | 32 | 7 |
| 2023 | 14 | 1 |
| 2022 | 13 | 2 |
| 2021 | 10 | 0 |
| 2020 | 6 | 0 |
| 2019 | 14 | 1 |
| 2018 | 16 | 0 |
| 2017 | 20 | 0 |
| 2016 | 7 | 1 |
| 2015 | 8 | 0 |
| 2014 | 29 | 0 |
| 2013 | 15 | 0 |
| 2012 | 18 | 0 |
| 2011 | 34 | 2 |
| 2010 | 24 | 0 |
| 2009 | 20 | 1 |
| 2008 | 29 | 1 |
| 2007 | 30 | 0 |
| 2006 | 10 | 0 |
| 2005 | 20 | 0 |
| 2004 | 30 | 1 |
| 2003 | 10 | 0 |
| 2002 | 27 | 1 |
| 2001 | 25 | 1 |
| 2000 | 14 | 1 |
| 1999 | 19 | 2 |
| 1998 | 31 | 0 |
| 1997 | 22 | 0 |
| 1996 | 21 | 0 |
| 1995 | 3 | 0 |
| 1994 | 4 | 0 |
| 1992 | 7 | 2 |
| 1991 | 8 | 2 |
| 1990 | 8 | 0 |
| 1989 | 10 | 0 |
| 1988 | 2 | 0 |
| 1987 | 2 | 1 |
| 1986 | 5 | 0 |
| 1985 | 3 | 0 |
| 1984 | 3 | 2 |
| 1983 | 5 | 1 |
| 1982 | 1 | 0 |
| 1981 | 3 | 0 |
| 1980 | 4 | 1 |
| 1979 | 2 | 0 |
| 1976 | 1 | 0 |
| 1975 | 4 | 0 |
| 1974 | 2 | 0 |
| 1973 | 1 | 0 |
| 1972 | 3 | 1 |
| 1971 | 1 | 0 |
| 1970 | 2 | 0 |
| 1969 | 3 | 0 |
| 1968 | 1 | 0 |
| 1967 | 1 | 1 |
| 1965 | 1 | 0 |
| 1964 | 1 | 0 |
| 1962 | 1 | 0 |
| 1959 | 1 | 0 |
Search your address
See every tornado that passed within 25 miles of a place in Harrison County, measured to its path.
We couldn’t get your location. Check that location access is allowed for this site, or type an address.