Harrison storm history
Storm events recorded in Harrison, Iowa between 1950 and 2025.
669
Total events
33
Tornadoes
203
Hail
30
Floods
2
Deaths
$40.0M
Property damage
Most significant events
Strongest tornadoes, deadliest events, and biggest damage in this county. Up to 50 shown.
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…
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.
Excessive Heat Excessive Heat
Heat indices up to 114 impacted portions of the county for a few hours during the afternoon.
Flood Flood
This is a continuation of river flooding from the end of June. River levels crested along this stretch of the Missouri at the end of June, hence flood waters were receding by this time. As such, the greatest impacts were felt in June (and discussed in the June entry for StormData…
Hail Hail
Law enforcement reported ping-pong ball sized hail.
Flood Flood
Excessive rainfall across much of eastern South Dakota resulted in river flooding along the Missouri River at the end of June. Moderate flood stage was observed along the Missouri, with the Blair river gauge cresting at 32.3 feet at 14:30 CDT on 6/27. Flood stage for this river g…
Hail Hail
A trained spotter reported golf ball sized hail.
Hail Hail
A trained spotter reported ping-pong ball sized hail.
Flash Flood Flash Flood
Emergency Management relayed a delayed report of severe crop damage and crop fields washed out. Additionally, several county roads along with Easton Trail Road had around a foot of flowing water over them by the time the rain stopped falling. Department of Secondary Roads had cre…
Hail Hail
A trained spotter reported 3 inch hail.
Thunderstorm Wind Thunderstorm Wind
A trained spotter reported a measured wind gust of 65 miles per hour.
Thunderstorm Wind Thunderstorm Wind
A 73 miles per hour wind gust was recorded on a personal weather station.
Thunderstorm Wind Thunderstorm Wind
A 71 miles per hour wind gust was measured out of the Missouri Valley Airport.
Thunderstorm Wind Thunderstorm Wind
A 74 miles per hour wind gust was recorded on a personal weather station.
Thunderstorm Wind Thunderstorm Wind
A 58 miles per hour wind gust was measured on a personal weather station.
Thunderstorm Wind Thunderstorm Wind
Amateur Radio relayed a report of a tree down and several other trees with broken branches.
Thunderstorm Wind Thunderstorm Wind
An enhanced area of straight-line wind damage with a maximum speed of 107 mph created widespread damage across nearly 13 square miles. This damage was located 4 miles west of Modale where center pivots were overturned. The damage extended eastward into the Loess Hills where numer…
Tornado EF1 Tornado
This brief spin-up tornado caused significant tree damage across Missouri Valley, with the worst of the damage along 7th Street between Michigan St and Superior Street. Peak estimated winds were at 107 miles per hour. The maximum path width was measured at 150 yards, with an aver…
Thunderstorm Wind Thunderstorm Wind
An Iowa Department of Transportation automated station recorded a 61 mile per hour wind gust.
Tornado EF1 Tornado
This segment is a continuation of the EF-4 tornado that went through western Douglas and Washington Counties. Upon entering far southwestern Harrison County, the tornado moved across the Missouri River, crossing Highway 30 and the Union Pacific Rail line about one mile east of th…
Tornado EF1 Tornado
A tornado developed in woodlands about 4 NNW of Magnolia, IA. Road maintenance workers noted damage to the trees south of 174th Trail Road on the south side of Steer Creek. The tornado crossed 174th Trail breaking power poles and damaging a farmstead. The tornado moved generally …
Tornado EF0 Tornado
This tornado was based on an eyewitness observation of two simultaneous tornadoes passing east and west of a farmstead. There was little damage observed with this tornado, with only minor tree damage being reported. The peak estimated winds in this tornado were 70 mph, with a pea…
Tornado EF0 Tornado
This is the final segment for the EF-3 tornado that impacted Eppley Airfield and portions of western Pottawattamie County. The tornado crossed into far southern Harrison County less than a quarter mile from the York Road and Overton Avenue intersection. For the short time the tor…
Tornado EF1 Tornado
This is a continuation of the Minden, Iowa EF-3 tornado. This tornado briefly crossed into the far southeast corner of Harrison County. The tornado entered the county on York Road between the county line and Yates Avenue. It was less than a mile before the tornado crossed into Sh…
Events by year
| Year | Events | Tornadoes |
|---|---|---|
| 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 | 15 | 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 |