Winnebago County, Iowa tornadoes

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26confirmed tornadoes since NOAA records began in 1950 (the first here in 1961). Most recent: August 17, 2025, EFU. 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.

Recent warnings

Recent warnings in Winnebago County

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The record

At a glance

Total261950 to 2025
Per year0.3average since 1950
Peak monthJune10 of 26
StrongestF2May 9, 1963
Deaths0whole paths, see note
Injuries8whole paths, see note

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

Seasons

When tornadoes hit here

By month

100 Jan: 0Feb: 0Mar: 0Apr: 2May: 4Jun: 10Jul: 3Aug: 5Sep: 1Oct: 0Nov: 0Dec: 1JanFebMarAprMayJunJulAugSepOctNovDec

June is the peak month, with 10 of 26 tornadoes.

By time of day

90 12 AM: 1: 0: 03 AM: 0: 0: 06 AM: 0: 0: 09 AM: 0: 0: 112 PM: 1: 0: 43 PM: 1: 4: 96 PM: 3: 0: 29 PM: 0: 0: 012 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM

Most often around 5:00 PM. Times as recorded by NOAA, mostly Central Standard Time.

By year, 1950 to 2025

30 1950: 0: 0: 0: 0: 0: 0: 0: 0: 0: 01960: 0: 1: 1: 1: 0: 0: 0: 1: 0: 01970: 0: 0: 0: 0: 0: 0: 0: 0: 0: 11980: 1: 0: 2: 0: 3: 0: 0: 1: 0: 01990: 1: 0: 0: 1: 1: 1: 0: 0: 0: 12000: 0: 0: 0: 0: 0: 0: 0: 0: 1: 02010: 1: 1: 1: 0: 1: 0: 1: 0: 1: 02020: 0: 1: 0: 0: 0: 119501960197019801990200020102020

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
8
EF1
10
EF2
7
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

Strongest

F2, May 9, 1963

13.1 mile path Longest path

21 miles, F2

June 7, 1984, whole path Widest

400 yards, F2

May 9, 1963
Every tornado

All 26 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
Aug 17, 2025EFU0.4 mi35 yd00
Dec 15, 2021EF12.85 mi90 yd00
Jun 9, 2018EF12.75 mi80 yd00
Jul 27, 2016EF00.34 mi20 yd00
Jun 1, 2014EF01.08 mi25 yd00
May 4, 2012EF10.81 mi90 yd00
Jun 19, 2011EF00.24 mi30 yd00
Jun 17, 2010EF01.53 mi30 yd00
Jun 7, 2008EF16.37 mi150 yd00
Aug 9, 1999F211.5 mi40 yd00
Jun 6, 1995F00.1 mi13 yd00
Jul 7, 1994F00.5 mi33 yd00
Jun 8, 1993F10.3 mi30 yd00
Aug 2, 1990F27 mi63 yd00
Jul 11, 1987F15 mi20 yd00
Jun 7, 1984F218 mi127 yd00
Jun 7, 1984F221 mi150 yd01
Apr 26, 1984F18 mi10 yd05
May 17, 1982F213 mi80 yd00
May 4, 1982F13 mi40 yd00
Sep 20, 1980F210.2 mi60 yd00
Aug 28, 1979F01 mi60 yd00
Apr 2, 1967F17.2 mi200 yd02
May 9, 1963F213.1 mi400 yd00
Jun 17, 1962F11 mi200 yd00
This year

2026 preliminary reports not yet confirmed

Report dateLocationRating
May 17, 20264 N Crystal LakeNot 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 13, 2026.