Tornadoes · United States · Wyoming

Tornadoes in Big Horn County, Wyoming

32 tornadoes have crossed Big Horn County since 1950, 10th of the 23 counties in Wyoming with a tornado on record, an average of one every 2.4 years. They have killed 1 person and injured 2. None was rated F4 or above.

The rating scale

Tracks are drawn in the color of the rating. The United States rated tornadoes on Ted Fujita’s F scale until 31 January 2007 and on the Enhanced Fujita scale after it. Both run from 0 to 5, and both rate the damage rather than measure the wind: the speeds are what that damage is taken to imply.

  1. F0 / EF040 to 72 mph on the F scale, 65 to 85 mph on the EF scale

    Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

  2. F1 / EF173 to 112 mph on the F scale, 86 to 110 mph on the EF scale

    Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

  3. F2 / EF2113 to 157 mph on the F scale, 111 to 135 mph on the EF scale

    Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.

  4. F3 / EF3158 to 206 mph on the F scale, 136 to 165 mph on the EF scale

    Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

  5. F4 / EF4207 to 260 mph on the F scale, 166 to 200 mph on the EF scale

    Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

  6. F5 / EF5261 to 318 mph on the F scale, over 200 mph on the EF scale

    Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.

  7. Unrated

    The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.

Now

Tornadoes
32
Deaths
1
Injuries
2
F4 and above
0
Worst on record
F3, August 2, 1985

The deadliest in Big Horn County

  1. F2, Big Horn County, WyomingJune 26, 19591 killed, 1 injured

The strongest

  1. F3, Big Horn County, WyomingAugust 2, 1985F3, 0.2 mi (0 km)
  2. F2, Big Horn County, WyomingJune 26, 1959F2, 9.2 mi (15 km)
  3. F2, Big Horn County, WyomingJuly 4, 1978F2, 5.0 mi (8 km)
  4. F2, Big Horn County, WyomingJuly 9, 1962F2, 0.5 mi (1 km)
  5. F2, Big Horn County, WyomingJune 12, 1962F2, 0.5 mi (1 km)
  6. F2, Big Horn County, WyomingJune 3, 1958F2, 0.2 mi (0 km)
  7. F2, Big Horn County, WyomingJuly 24, 1967F2, 0.1 mi (0 km)

Every year with a tornado

The 20 years of the 76 in the record with a tornado in Big Horn County. Each year links to every tornado in Wyoming that year.

YearTornadoesDeathsInjuriesStrongest
20171EF0
20141EF0
20101EF0
20091EF1
20053F0
20012F1
19976F1
19921F0
19871F0
19851F3
19841F0
19811F1
197821F2
19761F1
19743F1
19671F2
19641F1
19622F2
1959111F2
19581F2

Every tornado that crossed Big Horn County

32 tornadoes, newest first.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
June 12, 20176:14 PM MDTEF0Big Horn3.130
May 24, 20142:36 PM MDTEF0Big Horn0.820
August 12, 20103:11 PM MDTEF0Big Horn2.430
June 1, 20093:58 PM MDTEF1Big Horn0.435$5,000
June 1, 20051:40 PM MDTF0Big Horn10.020
June 1, 20051:38 PM MDTF0Big Horn4.030
June 1, 20051:17 PM MDTF0Big Horn4.030
June 26, 20016:56 PM MDTF1Big Horn0.7400
June 26, 20016:42 PM MDTF0Big Horn0.550
July 24, 19974:09 PM MDTF0Big Horn0.150
June 13, 19977:35 PM MDTF0Big Horn0.130
June 13, 19977:25 PM MDTF0Big Horn0.130
June 6, 19976:10 PM MDTF1Big Horn1.050
June 6, 19976:00 PM MDTF0Big Horn0.230
June 6, 19975:58 PM MDTF0Big Horn0.550
July 12, 19921:55 PM MDTF0Big Horn0.110
June 18, 19876:08 PM MDTF0Big Horn2.013
August 2, 19851:30 PM MDTF3Big Horn0.210
May 3, 19846:30 PM MDTF0Big Horn0.510$500 to $5,000
July 24, 19813:00 PM MDTF1Big Horn0.110
July 4, 19782:30 PM MDTF2Big Horn5.02001$50,000 to $500,000
June 18, 19789:00 PM MDTF1Big Horn0.110$5,000 to $50,000
July 4, 19765:00 PM MDTF1Big Horn0.210
July 20, 19748:30 PM MDTF1Big Horn0.110$500 to $5,000
June 20, 19743:30 PM MDTF1Big Horn0.110$500 to $5,000
June 20, 19743:00 PM MDTF1Big Horn0.110$500 to $5,000
July 24, 19674:00 PM GMT-6F2Big Horn0.150$500 to $5,000
June 5, 19642:10 PM GMT-7F1Big Horn2.0100$5,000 to $50,000
July 9, 19623:00 PM GMT-7F2Big Horn0.517$500 to $5,000
June 12, 19623:00 PM GMT-7F2Big Horn0.533$500 to $5,000
June 26, 19593:00 PM GMT-7F2Big Horn9.233311$500 to $5,000
June 3, 19583:00 PM GMT-7F2Big Horn0.217$5,000 to $50,000

Nearby

Warnings in force in Big Horn CountyThe forecast for Big Horn CountyThe live radar over Big Horn CountyEvery county in Wyoming

What this means

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.

Sources

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.