Cass County, Iowa tornadoes

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43confirmed tornadoes since NOAA records began in 1950 (the first here in 1956). Most recent: June 28, 2024, 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 Cass County

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The record

At a glance

Total431950 to 2025
Per year0.6average since 1950
Peak monthJune13 of 43
StrongestF4Apr 8, 1999
Deaths0whole paths, see note
Injuries13whole paths, see note

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

Seasons

When tornadoes hit here

By month

130 Jan: 0Feb: 0Mar: 5Apr: 5May: 11Jun: 13Jul: 6Aug: 1Sep: 0Oct: 0Nov: 0Dec: 2JanFebMarAprMayJunJulAugSepOctNovDec

June is the peak month, with 13 of 43 tornadoes.

By time of day

60 12 AM: 1: 1: 03 AM: 0: 0: 26 AM: 0: 0: 19 AM: 2: 0: 012 PM: 0: 1: 53 PM: 3: 6: 46 PM: 3: 6: 39 PM: 2: 1: 212 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

50 1950: 0: 0: 0: 0: 0: 0: 1: 0: 0: 01960: 0: 0: 0: 1: 3: 1: 0: 0: 0: 01970: 1: 0: 0: 0: 1: 0: 1: 0: 0: 21980: 1: 2: 0: 0: 1: 3: 0: 1: 0: 01990: 2: 0: 1: 0: 0: 0: 0: 0: 1: 12000: 1: 0: 0: 0: 1: 0: 0: 1: 1: 32010: 0: 1: 0: 0: 0: 0: 0: 0: 0: 22020: 0: 2: 0: 2: 5: 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.

By rating

EF0
13
EF1
14
EF2
9
EF3
2
EF4
1
Unknown
4

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

F4, April 8, 1999

49 mile path Longest path

49 miles, F4

April 8, 1999, whole path Widest

1,000 yards, F4

April 8, 1999
Every tornado

All 43 tornadoes, newest first

DateRatingPath lengthWidthDeathsInjuries
Jun 28, 2024EFU0.3 mi20 yd00
Jun 28, 2024EFU0.4 mi30 yd00
Jun 28, 2024EF02.44 mi50 yd00
Jun 28, 2024EFU0.91 mi40 yd00
Apr 16, 2024EF10.87 mi30 yd00
Jul 12, 2023EF02.1 mi75 yd00
Jul 12, 2023EF01.46 mi50 yd00
Dec 15, 2021EF111.44 mi80 yd00
Dec 15, 2021EF227.11 mi100 yd00
Jul 16, 2019EFU1.41 mi30 yd00
May 22, 2019EF11.09 mi50 yd00
Mar 22, 2011EF12.84 mi250 yd00
Jun 7, 2009EF00.17 mi25 yd00
Mar 23, 2009EF00.99 mi35 yd00
Mar 23, 2009EF03.45 mi50 yd00
Jun 5, 2008EF01.53 mi50 yd00
May 6, 2007EF27.43 mi830 yd00
May 8, 2004F17 mi50 yd00
May 18, 2000F01 mi30 yd00
Apr 8, 1999F449 mi1,000 yd03
May 21, 1998F10.5 mi40 yd00
Jul 15, 1992F00.1 mi13 yd00
Jun 12, 1990F00.2 mi17 yd00
Jun 12, 1990F11 mi30 yd00
May 31, 1987F18 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.