Tornado History Map

Big Horn County, Wyoming tornado history

32 tornadoes recorded in or across Big Horn County from 1958 to 2017, 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 Big Horn County

The Storm Prediction Center records 32 tornadoes whose paths touched Big Horn County, Wyoming between 1958 and 2017. They killed 1 person and injured 2. The busiest month is June, with 20 tornadoes. The strongest was an F3 on 2 August 1985. The most recent was on 12 June 2017.

  • 32tornadoes
  • 1death
  • 2injuries
  • 102per 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 Big Horn County?

RatingTornadoesShare
F0 / EF01547%
F1 / EF11031%
F2 / EF2619%
F3 / EF313%
F4 / EF400%
F5 / EF500%
Unknown rating00%

Big Horn County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 7 in 1990s.1950s21960s41970s61980s41990s72000s62010s3

The 2010s only run to 2017, so that bar is for a shorter period. The record starts in 1950.

Show the numbers
PeriodCount
1950s2
1960s4
1970s6
1980s4
1990s7
2000s6
2010s3
Tornadoes by month
Bar chart of tornadoes by period. The most is 20 in Jun.Jan0Feb0Mar0Apr0May2Jun20Jul8Aug2Sep0Oct0Nov0Dec0
Show the numbers
PeriodCount
Jan0
Feb0
Mar0
Apr0
May2
Jun20
Jul8
Aug2
Sep0
Oct0
Nov0
Dec0

Records for Big Horn County

  • Deadliest: Wyoming tornado26 June 1959, F2, 1 death, 1 injury, 9.2 miles long
  • Strongest: Wyoming tornado2 August 1985, F3, 0.2 miles long
  • Longest path: Wyoming tornado1 June 2005, F0, 10 miles long
  • Most recent: Wyoming tornado12 June 2017, EF0, 3.1 miles long

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

More in Wyoming

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