Lyon County, Iowa tornadoes

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45confirmed tornadoes since NOAA records began in 1950 (the first here in 1951). Most recent: July 28, 2025, EFU. 2026 so far: 0 preliminary reports 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 Lyon County

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The record

At a glance

Total451950 to 2025
Per year0.6average since 1950
Peak monthJune15 of 45
StrongestEF4Jun 25, 2010
Deaths1whole paths, see note
Injuries22whole paths, see note

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

Seasons

When tornadoes hit here

By month

150 Jan: 0Feb: 0Mar: 0Apr: 8May: 10Jun: 15Jul: 10Aug: 2Sep: 0Oct: 0Nov: 0Dec: 0JanFebMarAprMayJunJulAugSepOctNovDec

June is the peak month, with 15 of 45 tornadoes.

By time of day

80 12 AM: 0: 2: 03 AM: 0: 0: 06 AM: 0: 0: 09 AM: 0: 0: 012 PM: 0: 1: 23 PM: 3: 7: 76 PM: 8: 3: 79 PM: 2: 2: 112 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM

Most often around 6:00 PM. Times as recorded by NOAA, mostly Central Standard Time.

By year, 1950 to 2025

40 1950: 0: 1: 1: 0: 1: 0: 0: 0: 0: 01960: 1: 0: 0: 1: 0: 0: 0: 0: 0: 01970: 0: 0: 0: 1: 0: 1: 0: 0: 2: 01980: 1: 0: 0: 0: 0: 2: 2: 1: 0: 11990: 0: 0: 0: 3: 2: 1: 0: 2: 1: 02000: 1: 1: 0: 1: 2: 0: 0: 0: 4: 12010: 2: 0: 0: 0: 2: 0: 0: 0: 0: 12020: 0: 0: 2: 0: 1: 219501960197019801990200020102020

The line is the five-year average. Tornadoes before about 1953 were under-reported, and better radar since the 1990s finds more weak ones.

By rating

EF0
20
EF1
16
EF2
7
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

F2, April 26, 1986

1 deaths, 4 injuries Strongest

EF4, June 25, 2010

13.65 mile path Longest path

18.5 miles, F2

April 26, 1986, whole path Widest

880 yards, F2

June 19, 1954
Every tornado

All 45 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
Jul 28, 2025EFU0.21 mi50 yd00
Jul 28, 2025EF12.06 mi250 yd00
Apr 16, 2024EF10.99 mi75 yd00
May 30, 2022EF00.54 mi60 yd00
May 30, 2022EF11.94 mi100 yd00
Aug 17, 2019EF16.95 mi75 yd00
Jun 17, 2014EF00.3 mi50 yd00
Jun 16, 2014EF00.2 mi50 yd00
Jun 25, 2010EF11.22 mi100 yd00
Jun 25, 2010EF413.65 mi800 yd013
Jun 21, 2009EF00.43 mi50 yd00
Jun 11, 2008EF00.85 mi50 yd00
May 1, 2008EF00.1 mi50 yd00
May 1, 2008EF00.1 mi50 yd00
May 1, 2008EF212.95 mi400 yd00
May 9, 2004F00.5 mi50 yd00
Apr 18, 2004F14 mi100 yd00
Jun 24, 2003F00.1 mi50 yd00
Jun 12, 2001F00.1 mi50 yd00
Jul 9, 2000F13 mi100 yd00
Jun 27, 1998F00.1 mi50 yd00
Jul 7, 1997F00.1 mi50 yd00
Jul 7, 1997F00.1 mi50 yd00
Aug 4, 1995F00.1 mi10 yd00
Jun 12, 1994F00.1 mi20 yd00
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.