Tornado History Map

Cass County, Iowa tornado history

47 tornadoes recorded in or across Cass County from 1956 to 2024, coloured by rating on the map.

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Years1950 to 2025
Rating (F or EF scale)

Shows tornadoes that started in, or crossed, the chosen state. To see how many have passed near you, search a town or ZIP code, or tap the map.

Key
  • F0 / EF0 Light damage
  • F1 / EF1 Moderate damage
  • F2 / EF2 Considerable damage
  • F3 / EF3 Severe damage
  • F4 / EF4 Devastating damage
  • F5 / EF5 Incredible damage
  • Unknown Not rated (2007 onwards)

How to read the lines. Each line is one tornado, drawn from where it started to where it ended, coloured and sized by its rating. A dot means the record has no end point. Tap a line for its details, or tap anywhere else to see how many tornadoes have passed nearby. Weaker tornadoes appear as you zoom in. Ratings use the Fujita (F) scale before 1 February 2007 and the Enhanced Fujita (EF) scale from then on.

Tornadoes in Cass County

The Storm Prediction Center records 47 tornadoes whose paths touched Cass County, Iowa between 1956 and 2024. None of them is recorded as having killed anyone. The busiest month is June, with 13 tornadoes. The strongest was an F4 on 8 April 1999. The most recent was on 28 June 2024.

  • 47tornadoes
  • 0deaths
  • 15injuries
  • 833per 10,000 sq mi of land

A tornado that crossed several counties counts in each one, so county counts add up to more than the state's.

How strong were the tornadoes in Cass County?

RatingTornadoesShare
F0 / EF01328%
F1 / EF11736%
F2 / EF2919%
F3 / EF336%
F4 / EF412%
F5 / EF500%
Unknown rating49%

Cass County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 9 in 1980s.1950s21960s61970s51980s91990s62000s72010s32020s9

The 2020s only run to 2024, so that bar is for a shorter period. The record starts in 1950.

Show the numbers
PeriodCount
1950s2
1960s6
1970s5
1980s9
1990s6
2000s7
2010s3
2020s9
Tornadoes by month
Bar chart of tornadoes by period. The most is 13 in Jun.Jan0Feb0Mar5Apr6May12Jun13Jul6Aug2Sep0Oct1Nov0Dec2
Show the numbers
PeriodCount
Jan0
Feb0
Mar5
Apr6
May12
Jun13
Jul6
Aug2
Sep0
Oct1
Nov0
Dec2

Records for Cass County

Notable tornadoes in Cass County

Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.

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