Walworth County, South Dakota tornadoes

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30confirmed tornadoes since NOAA records began in 1950 (the first here in 1955). Most recent: September 14, 2025, EF1. 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 Walworth County

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The record

At a glance

Total301950 to 2025
Per year0.4average since 1950
Peak monthJune14 of 30
StrongestEF4May 22, 2010
Deaths0whole paths, see note
Injuries2whole paths, see note

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

Seasons

When tornadoes hit here

By month

140 Jan: 0Feb: 0Mar: 0Apr: 2May: 3Jun: 14Jul: 6Aug: 4Sep: 1Oct: 0Nov: 0Dec: 0JanFebMarAprMayJunJulAugSepOctNovDec

June is the peak month, with 14 of 30 tornadoes.

By time of day

90 12 AM: 0: 1: 03 AM: 0: 0: 06 AM: 0: 0: 09 AM: 0: 0: 112 PM: 1: 1: 03 PM: 1: 3: 56 PM: 3: 9: 29 PM: 1: 2: 012 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM

Most often around 7:00 PM. Times as recorded by NOAA, mostly Central Standard Time.

By year, 1950 to 2025

50 1950: 0: 0: 0: 0: 0: 2: 0: 0: 0: 11960: 0: 1: 0: 0: 1: 0: 0: 0: 2: 01970: 1: 1: 0: 1: 0: 0: 0: 0: 2: 01980: 0: 0: 0: 0: 0: 1: 1: 0: 0: 01990: 0: 1: 0: 1: 1: 1: 0: 0: 0: 02000: 0: 0: 0: 0: 0: 0: 0: 5: 0: 12010: 3: 1: 0: 0: 0: 0: 0: 0: 1: 02020: 0: 0: 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.

By rating

EF0
15
EF1
8
EF2
4
EF3
2
EF4
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

EF4, May 22, 2010

5.7 mile path Longest path

24.6 miles, F2

June 18, 1964, whole path Widest

1,200 yards, EF4

May 22, 2010
Every tornado

All 30 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
Sep 14, 2025EF13.99 mi200 yd00
Jun 1, 2018EF00.11 mi10 yd00
Jul 26, 2011EF00.37 mi10 yd00
May 22, 2010EF45.7 mi1,200 yd00
May 22, 2010EF10.5 mi100 yd00
May 22, 2010EF00.48 mi50 yd00
Jun 16, 2009EF00.15 mi10 yd00
Aug 10, 2007EF00.1 mi10 yd00
Jun 17, 2007EF00.1 mi10 yd00
Jun 17, 2007EF00.2 mi20 yd00
Jun 17, 2007EF00.1 mi10 yd00
Jun 17, 2007EF00.1 mi10 yd00
Jul 3, 1995F00.1 mi10 yd00
Jun 6, 1994F00.1 mi10 yd00
Jul 22, 1993F05 mi30 yd00
Jul 21, 1991F03 mi23 yd00
Aug 6, 1986F11.5 mi40 yd00
Aug 22, 1985F00.2 mi10 yd00
Jun 15, 1978F00.1 mi10 yd00
Jun 15, 1978F10.1 mi10 yd00
Aug 18, 1973F10.4 mi10 yd00
Jun 9, 1971F10.1 mi10 yd00
Jul 29, 1970F10.5 mi50 yd00
Jun 20, 1968F38.8 mi200 yd00
Jun 20, 1968F30.1 mi10 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.