Tornado History Map

Johnson County, Wyoming tornado history

22 tornadoes recorded in or across Johnson County from 1971 to 2019, 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 22 tornadoes whose paths touched Johnson County, Wyoming between 1971 and 2019. None of them is recorded as having killed anyone. The busiest month is June, with 14 tornadoes. The strongest was an EF2 on 12 June 2017. The most recent was on 19 June 2019.

  • 22tornadoes
  • 0deaths
  • 2injuries
  • 53per 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 / EF01359%
F1 / EF1732%
F2 / EF229%
F3 / EF300%
F4 / EF400%
F5 / EF500%
Unknown rating00%

Johnson County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 10 in 1970s.1970s101980s31990s42000s12010s4

The 2010s only run to 2019, so that bar is for a shorter period. The record starts in 1950.

Show the numbers
PeriodCount
1970s10
1980s3
1990s4
2000s1
2010s4
Tornadoes by month
Bar chart of tornadoes by period. The most is 14 in Jun.Jan0Feb0Mar0Apr0May4Jun14Jul2Aug2Sep0Oct0Nov0Dec0
Show the numbers
PeriodCount
Jan0
Feb0
Mar0
Apr0
May4
Jun14
Jul2
Aug2
Sep0
Oct0
Nov0
Dec0

Records for Johnson County

  • Strongest: Wyoming tornado12 June 2017, EF2, 1.6 miles long
  • Longest path: Wyoming tornado9 May 1977, F1, 4.5 miles long
  • Most recent: Wyoming tornado19 June 2019, EF1, 4.1 miles long

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

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