Grundy County, Illinois tornadoes

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26confirmed tornadoes since NOAA records began in 1950 (the first here in 1955). Most recent: July 15, 2024, EF2. 2026 so far: 2 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 Grundy County

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The record

At a glance

Total261950 to 2025
Per year0.3average since 1950
Peak monthJune8 of 26
StrongestF3Jul 17, 1972
Deaths2whole paths, see note
Injuries106whole paths, see note

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

Seasons

When tornadoes hit here

By month

80 Jan: 0Feb: 1Mar: 0Apr: 5May: 5Jun: 8Jul: 3Aug: 0Sep: 0Oct: 0Nov: 3Dec: 1JanFebMarAprMayJunJulAugSepOctNovDec

June is the peak month, with 8 of 26 tornadoes.

By time of day

80 12 AM: 0: 0: 03 AM: 0: 0: 06 AM: 0: 0: 09 AM: 0: 0: 012 PM: 2: 1: 23 PM: 1: 2: 56 PM: 2: 2: 89 PM: 1: 0: 012 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM

Most often around 8:00 PM. Times as recorded by NOAA, mostly Central Standard Time.

By year, 1950 to 2025

30 1950: 0: 0: 0: 0: 0: 1: 0: 0: 1: 01960: 0: 0: 0: 0: 0: 2: 0: 0: 0: 01970: 0: 0: 1: 1: 1: 1: 0: 0: 0: 01980: 0: 0: 0: 0: 1: 1: 0: 0: 2: 01990: 0: 0: 0: 0: 0: 0: 0: 0: 0: 02000: 0: 0: 0: 0: 1: 0: 0: 0: 0: 02010: 0: 0: 0: 2: 1: 3: 2: 1: 0: 02020: 2: 0: 0: 1: 1: 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: 2 preliminary reports.

By rating

EF0
9
EF1
5
EF2
9
EF3
2
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, November 12, 1965

2 deaths, 90 injuries Strongest

F3, July 17, 1972

81.5 mile path Longest path

81.5 miles, F3

July 17, 1972, whole path Widest

1,320 yards, EF3

June 22, 2015
Every tornado

All 26 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
Jul 15, 2024EF234.6 mi325 yd02
Jul 28, 2023EF05.1 mi250 yd00
May 23, 2020EF06.3 mi100 yd01
May 17, 2020EFU0.52 mi25 yd00
Feb 28, 2017EF01.2 mi200 yd00
Jun 22, 2016EF00.7 mi100 yd00
Jun 22, 2016EF28.05 mi300 yd00
Jun 22, 2015EF316.26 mi1,320 yd07
Jun 22, 2015EF10.77 mi100 yd00
Jun 22, 2015EF17.05 mi150 yd00
Jun 30, 2014EF02.16 mi50 yd00
Nov 17, 2013EF212.02 mi200 yd05
May 28, 2013EF01.85 mi20 yd00
Apr 20, 2004F02 mi20 yd00
May 8, 1988F11 mi10 yd00
Apr 5, 1988F230 mi50 yd00
Jun 15, 1985F013 mi10 yd00
Apr 27, 1984F12.7 mi150 yd00
May 20, 1975F22 mi50 yd01
Apr 3, 1974F00.1 mi10 yd00
Apr 19, 1973F20.1 mi10 yd00
Jul 17, 1972F381.5 mi200 yd00
Nov 12, 1965F235.9 mi120 yd290
Nov 12, 1965F232.1 mi17 yd00
Jun 8, 1958F11 mi10 yd00
This year

2026 preliminary reports not yet confirmed

Report dateLocationRating
Aug 11, 20263 N MorrisNot yet rated
Aug 11, 20265 E SenecaNot 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.