Tornado History Map

O'Brien County, Iowa tornado history

37 tornadoes recorded in or across O'Brien County from 1951 to 2024, coloured by rating on the map.

Tap or scroll to load the interactive map

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 O'Brien County

The Storm Prediction Center records 37 tornadoes whose paths touched O'Brien County, Iowa between 1951 and 2024. None of them is recorded as having killed anyone. The busiest month is June, with 15 tornadoes. The strongest was an F3 on 5 May 1964. The most recent was on 20 July 2024.

  • 37tornadoes
  • 0deaths
  • 9injuries
  • 646per 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 O'Brien County?

RatingTornadoesShare
F0 / EF01849%
F1 / EF11232%
F2 / EF2411%
F3 / EF325%
F4 / EF400%
F5 / EF500%
Unknown rating13%

O'Brien County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 11 in 2000s.1950s11960s51970s21980s41990s32000s112010s72020s4

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

Show the numbers
PeriodCount
1950s1
1960s5
1970s2
1980s4
1990s3
2000s11
2010s7
2020s4
Tornadoes by month
Bar chart of tornadoes by period. The most is 15 in Jun.Jan0Feb0Mar0Apr4May8Jun15Jul5Aug0Sep0Oct3Nov0Dec2
Show the numbers
PeriodCount
Jan0
Feb0
Mar0
Apr4
May8
Jun15
Jul5
Aug0
Sep0
Oct3
Nov0
Dec2

Records for O'Brien County

  • Strongest and Longest path: Iowa tornado5 May 1964, F3, 7 injuries, 67 miles long
  • Most recent: Iowa tornado20 July 2024, Unknown rating, 0.6 miles long

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

More in Iowa

Embed this map

Copy this code into your web page. It is free to use. Please keep the link under the map, as it is how people find where the map comes from.