Harrison County, Iowa tornadoes

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35confirmed tornadoes since NOAA records began in 1950 (the first here in 1967). Most recent: May 24, 2024, EF1. 2026 so far: 1 preliminary report preliminary

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Map

Every tornado path in the county

Tornado paths, 1950 to 2025
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(E)F0(E)F1(E)F2(E)F3(E)F4(E)F5Unrated

Each path is a straight line from where the tornado started to where it ended, which is all most NOAA records hold. Tap a path for its details.

The record

At a glance

Total351950 to 2025
Per year0.5average since 1950
Peak monthJune11 of 35
StrongestEF4Apr 26, 2024
Deaths7whole paths, see note
Injuries76whole paths, see note

Deaths and injuries are NOAA's totals for each tornado's whole path, which can extend beyond Harrison County.

Seasons

When tornadoes hit here

By month

110 Jan: 0Feb: 0Mar: 2Apr: 10May: 9Jun: 11Jul: 1Aug: 0Sep: 2Oct: 0Nov: 0Dec: 0JanFebMarAprMayJunJulAugSepOctNovDec

June is the peak month, with 11 of 35 tornadoes.

By time of day

70 12 AM: 0: 1: 03 AM: 0: 0: 16 AM: 0: 0: 09 AM: 0: 0: 012 PM: 1: 0: 33 PM: 5: 7: 46 PM: 5: 4: 29 PM: 1: 0: 112 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM

Most often around 4:00 PM. Times as recorded by NOAA, mostly Central Standard Time.

By year, 1950 to 2025

70 1950: 0: 0: 0: 0: 0: 0: 0: 0: 0: 01960: 0: 0: 0: 0: 0: 0: 0: 1: 0: 01970: 0: 0: 1: 0: 0: 2: 0: 0: 0: 01980: 1: 0: 0: 1: 2: 0: 0: 1: 0: 01990: 0: 2: 2: 0: 0: 0: 0: 0: 0: 22000: 1: 1: 1: 0: 1: 0: 0: 0: 1: 12010: 0: 2: 0: 0: 0: 0: 1: 0: 0: 12020: 0: 0: 2: 1: 7: 019501960197019801990200020102020

The line is the five-year average. Tornadoes before about 1953 were under-reported, and better radar since the 1990s finds more weak ones. This year so far: 1 preliminary reports.

By rating

EF0
11
EF1
10
EF2
6
EF3
6
EF4
1
Unknown
1

Ratings before February 2007 use the original F scale; the numbers line up with today's EF scale. Unknown means NOAA could not assign a rating.

The record

Notable tornadoes

Deadliest

EF3, June 11, 2008

4 deaths, 48 injuries Strongest

EF4, April 26, 2024

31.89 mile path Longest path

40.27 miles, EF3

April 26, 2024, whole path Widest

1,900 yards, EF4

April 26, 2024
Every tornado

All 35 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
May 24, 2024EF10.65 mi150 yd00
Apr 26, 2024EF11.84 mi30 yd00
Apr 26, 2024EF340.27 mi1,900 yd13
Apr 26, 2024EF02.64 mi200 yd00
Apr 26, 2024EF319.06 mi550 yd00
Apr 26, 2024EF19.12 mi766 yd00
Apr 26, 2024EF431.89 mi1,900 yd04
Jul 12, 2023EF29.4 mi100 yd00
Apr 12, 2022EF02.3 mi200 yd00
Apr 12, 2022EF19.55 mi140 yd00
Sep 24, 2019EFU0.05 mi25 yd00
Jun 29, 2016EF03.28 mi25 yd00
Jun 26, 2011EF03.6 mi100 yd00
Mar 22, 2011EF111.67 mi100 yd02
Mar 23, 2009EF28.6 mi440 yd00
Jun 11, 2008EF312.96 mi440 yd448
May 22, 2004F00.2 mi60 yd00
Apr 17, 2002F02 mi25 yd00
Jun 18, 2001F00.2 mi25 yd00
Jun 13, 2000F110.6 mi330 yd00
May 16, 1999F37.5 mi440 yd216
May 16, 1999F36.2 mi200 yd00
Jun 16, 1992F326 mi200 yd03
May 16, 1992F00.1 mi13 yd00
Jun 14, 1991F00.2 mi20 yd00
This year

2026 preliminary reports not yet confirmed

Report dateLocationRating
Apr 23, 20262 N Little SiouxNot yet rated

Preliminary reports from the Storm Prediction Center. One tornado can be reported more than once, and NOAA confirms the final record months later.

Nearby

Nearby counties

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Source: NOAA Storm Prediction Center severe weather database, 1950 to 2025, and SPC preliminary reports for 2026. Page built October 12, 2026.