A supercell thunderstorm tracked east-northeast across central Campbell County. As the storm approached Gillette, it produced multiple tornadoes. A storm survey, along with photos and video, determined that four tornadoes occurred just west and north of Gillette. The largest tornado was on the ground for about ten minutes and briefly reached EF-3 strength as it tracked about ten miles west-northwest of Gillette. There were two injuries, with significant damage to numerous buildings and homes along its path.

Tornado in CAMPBELL, WYOMING
From 01-JUN-18 12:41:00 to 01-JUN-18 12:52:00 (MST-7)
Location: (GCC)GILLETTE ARPT
Tornado F-scale: EF3
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado touched down about ten miles west-northwest of downtown Gillette. It was on the ground for about 11 minutes over the Oriva Hills subdivision. The tornado destroyed and damaged numerous homes and outbuildings, rolled vehicles, and snapped electrical transmission poles and trees. Top wind speeds were estimated at 136 mph, so the tornado was rated as an EF-3.

Funnel Cloud in CAMPBELL, WYOMING
From 01-JUN-18 12:30:00 to 01-JUN-18 12:30:00 (MST-7)
Location: (GCC)GILLETTE ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in CAMPBELL, WYOMING
From 01-JUN-18 12:30:00 to 01-JUN-18 12:30:00 (MST-7)
Location: ECHETA
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Hail in CAMPBELL, WYOMING
From 01-JUN-18 12:40:00 to 01-JUN-18 12:40:00 (MST-7)
Location: ECHETA
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Public

Tornado in CAMPBELL, WYOMING
From 01-JUN-18 12:34:00 to 01-JUN-18 12:38:00 (MST-7)
Location: (GCC)GILLETTE ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A brief tornado touched down about ten miles west of downtown Gillette between Montgomery Road and Echeta Road, south of the Oriva Hills subdivision. It was on the ground for about four minutes. Since it left no visible damage, the tornado was rated as EF-0.

Tornado in CAMPBELL, WYOMING
From 01-JUN-18 12:55:00 to 01-JUN-18 12:56:00 (MST-7)
Location: GILLETTE
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A short-lived landspout tornado developed three miles north-northeast of downtown Gillette in the Warrior Hills subdivision. It damaged a large shed, flipped a camper onto a vehicle, destroyed another camper, and damaged several wooded fences. Winds were estimated at 80 to 90 mph, giving the tornado a rating as a weak EF-1.

Tornado in CAMPBELL, WYOMING
From 01-JUN-18 12:59:00 to 01-JUN-18 13:07:00 (MST-7)
Location: (GCC)GILLETTE ARPT
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: Trained Spotter

The tornado touched down over the west pit of the Eagle Butte Mine, about seven miles north of downtown Gillette. The tornado traveled east-northeast for about eight minutes before dissipating just east of the Dry Fork Power Plant. The tornado snapped and bent over seven power poles, damaged the control room building at the mine, and damaged several vehicles at the Eagle Butte Mine and Dry Fork Power Plant. With wind speeds estimated at 100 mph, the tornado was rated as an EF-1.