Tornado History Map

Lyon County, Iowa tornado history

49 tornadoes recorded in or across Lyon County from 1951 to 2025, 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 Lyon County

The Storm Prediction Center records 49 tornadoes whose paths touched Lyon County, Iowa between 1951 and 2025. They killed 1 person and injured 22. The busiest month is June, with 16 tornadoes. The strongest was an EF4 on 25 June 2010. The most recent was on 28 July 2025.

  • 49tornadoes
  • 1death
  • 22injuries
  • 834per 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 Lyon County?

RatingTornadoesShare
F0 / EF02041%
F1 / EF11939%
F2 / EF2714%
F3 / EF312%
F4 / EF412%
F5 / EF500%
Unknown rating12%

Lyon County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 10 in 1990s.1950s31960s41970s51980s71990s102000s102010s52020s5

The 2020s only run to 2025, so that bar is for a shorter period. The record starts in 1950.

Show the numbers
PeriodCount
1950s3
1960s4
1970s5
1980s7
1990s10
2000s10
2010s5
2020s5
Tornadoes by month
Bar chart of tornadoes by period. The most is 16 in Jun.Jan0Feb0Mar1Apr8May12Jun16Jul10Aug2Sep0Oct0Nov0Dec0
Show the numbers
PeriodCount
Jan0
Feb0
Mar1
Apr8
May12
Jun16
Jul10
Aug2
Sep0
Oct0
Nov0
Dec0

Records for Lyon County

  • Deadliest: Iowa tornado26 April 1986, F2, 1 death, 4 injuries, 18.5 miles long
  • Strongest: Little Rock, Iowa tornado25 June 2010, EF4, 13 injuries, 13.7 miles long
  • Longest path: Iowa tornado31 May 1971, F3, 46.5 miles long
  • Most recent: Iowa tornado28 July 2025, Unknown rating, 0.2 miles long

Notable tornadoes in Lyon 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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