Tornado History Map

Johnson County, Iowa tornado history

48 tornadoes recorded in or across Johnson County from 1953 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 Johnson County

The Storm Prediction Center records 48 tornadoes whose paths touched Johnson County, Iowa between 1953 and 2024. They killed 4 people and injured 92. The busiest month is April, with 16 tornadoes. The strongest was an EF4 on 31 March 2023. The most recent was on 24 May 2024.

  • 48tornadoes
  • 4deaths
  • 92injuries
  • 783per 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 Johnson County?

RatingTornadoesShare
F0 / EF01225%
F1 / EF12042%
F2 / EF21429%
F3 / EF312%
F4 / EF412%
F5 / EF500%
Unknown rating00%

Johnson County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 10 in 2000s.1950s21960s11970s81980s71990s52000s102010s52020s10

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

Show the numbers
PeriodCount
1950s2
1960s1
1970s8
1980s7
1990s5
2000s10
2010s5
2020s10
Tornadoes by month
Bar chart of tornadoes by period. The most is 16 in Apr.Jan0Feb0Mar7Apr16May14Jun4Jul2Aug2Sep2Oct0Nov1Dec0
Show the numbers
PeriodCount
Jan0
Feb0
Mar7
Apr16
May14
Jun4
Jul2
Aug2
Sep2
Oct0
Nov1
Dec0

Records for Johnson County

  • Deadliest: Iowa tornado27 April 2014, EF1, 2 deaths, 45.7 miles long
  • Strongest: Harper, Iowa tornado31 March 2023, EF4, 3 injuries, 19.9 miles long
  • Longest path: Iowa tornado7 June 1953, F2, 116 miles long
  • Most recent: Iowa tornado24 May 2024, EF0, 0.1 miles long

Notable tornadoes in Johnson County

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

More in Iowa

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