One of the most significant severe weather episodes to affect southeast Wyoming and the western Nebraska Panhandle occurred on the afternoon and early evening of Monday 12 June 2017. Eleven confirmed tornadoes, hail to grapefruit size, and damaging winds were observed. Supercell thunderstorms developed during the early afternoon along Interstate 25 between Fort Collins, CO and Wheatland.  Lifting northeast, these thunderstorms spread into the southeast Wyoming plains late in the afternoon and into the western Nebraska Panhandle during the evening. Two people suffered injuries with an EF-2 rated tornado north of Torrington near the Wyoming/Nebraska stateline.

Hail in CONVERSE, WYOMING
From 12-JUN-17 16:20:00 to 12-JUN-17 16:23:00 (MST-7)
Location: DOUGLAS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hen egg size hail was observed two miles east of Douglas.

Funnel Cloud in LARAMIE, WYOMING
From 12-JUN-17 16:20:00 to 12-JUN-17 16:23:00 (MST-7)
Location: PINE BLUFFS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A funnel cloud was reported five miles south of Pine Bluffs.

Funnel Cloud in LARAMIE, WYOMING
From 12-JUN-17 16:23:00 to 12-JUN-17 16:25:00 (MST-7)
Location: PINE BLUFFS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A funnel cloud was reported three miles south of Pine Bluffs.

Hail in GOSHEN, WYOMING
From 12-JUN-17 16:26:00 to 12-JUN-17 16:30:00 (MST-7)
Location: PRAIRIE CENTER
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Baseball size hail was reported east of Prairie Center.

Hail in PLATTE, WYOMING
From 12-JUN-17 14:13:00 to 12-JUN-17 14:15:00 (MST-7)
Location: WHEATLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was observed at Wheatland.

Hail in PLATTE, WYOMING
From 12-JUN-17 14:14:00 to 12-JUN-17 14:16:00 (MST-7)
Location: WHEATLAND
Magnitude: 4.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Grapefruit size hail was observed a mile south of Wheatland. Several vehilcle windshilds were damaged.

Funnel Cloud in PLATTE, WYOMING
From 12-JUN-17 14:14:00 to 12-JUN-17 14:17:00 (MST-7)
Location: BORDEAUX
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was observed near Weber and Deer Creek Road.

Hail in LARAMIE, WYOMING
From 12-JUN-17 15:01:00 to 12-JUN-17 15:03:00 (MST-7)
Location: CHEYENNE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Half dollar size hail was observed three miles north of Cheyenne.

Hail in LARAMIE, WYOMING
From 12-JUN-17 15:03:00 to 12-JUN-17 15:05:00 (MST-7)
Location: CHEYENNE
Magnitude: 4.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Softball size hail damaged some businesses and vehicles east of Yellowstone Road and Vandehei Avenue.

Hail in LARAMIE, WYOMING
From 12-JUN-17 15:05:00 to 12-JUN-17 15:08:00 (MST-7)
Location: CHEYENNE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Baseball size hail damaged emergency manager's home at 107 Trinidad Court.

Hail in CONVERSE, WYOMING
From 12-JUN-17 16:27:00 to 12-JUN-17 16:30:00 (MST-7)
Location: DOUGLAS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hen egg size hail was observed at Douglas.

Hail in LARAMIE, WYOMING
From 12-JUN-17 16:30:00 to 12-JUN-17 16:35:00 (MST-7)
Location: PINE BLUFFS
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail slightly larger than baseball size was observed at Pine Bluffs.

Hail in LARAMIE, WYOMING
From 12-JUN-17 17:27:00 to 12-JUN-17 17:30:00 (MST-7)
Location: ALBIN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Golf ball size hail was reported five miles north of Albin.

Hail in LARAMIE, WYOMING
From 12-JUN-17 15:07:00 to 12-JUN-17 15:10:00 (MST-7)
Location: CHEYENNE
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail grew rapidly from peas to larger than golf balls.

Hail in PLATTE, WYOMING
From 12-JUN-17 14:21:00 to 12-JUN-17 14:25:00 (MST-7)
Location: WHEATLAND
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hen egg to baseball size hail damaged many vehicles and windows in Wheatland.

Hail in PLATTE, WYOMING
From 12-JUN-17 14:15:00 to 12-JUN-17 14:18:00 (MST-7)
Location: BORDEAUX
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hen egg size hail was observed two miles north of Bordeaux.

Hail in CONVERSE, WYOMING
From 12-JUN-17 17:30:00 to 12-JUN-17 17:35:00 (MST-7)
Location: GLENROCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Quarter size hail was observed a mile southwest of Glenrock.

Hail in PLATTE, WYOMING
From 12-JUN-17 14:25:00 to 12-JUN-17 14:28:00 (MST-7)
Location: WHEATLAND
Magnitude: 4.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Grapefruit size hail was observed three miles south of Wheatland.

Hail in PLATTE, WYOMING
From 12-JUN-17 14:30:00 to 12-JUN-17 14:33:00 (MST-7)
Location: BORDEAUX
Magnitude: 4.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Grapefruit size hail was observed three miles north of Bordeaux.

Tornado in GOSHEN, WYOMING
From 12-JUN-17 14:55:00 to 12-JUN-17 15:07:00 (MST-7)
Location: ROCKEAGLE
Tornado F-scale: EFU
Reported by: Emergency Manager

Emergency management, an off-duty NWS employee, and storm chasers observed a series of tornado touchdowns in rural western Goshen County. The tornado path was discontinuous with no damage from which the NWS could assign an EF-scale rating.

Tornado in LARAMIE, WYOMING
From 12-JUN-17 15:40:00 to 12-JUN-17 15:44:00 (MST-7)
Location: DURHAM
Tornado F-scale: EF0
Reported by: NWS Employee

A brief tornado touchdown occurred 11 miles northeast of Cheyenne approximately 1.25 miles southeast of the intersection of Highway 85 and CR 222.  This tornado moved north causing damage to irrigation center pivot, windows, roof, and outbuildings of one rural residence (DI 4, DOD 4). The tornado moved across US Highway 85 and lifted approximately 1.75 miles northeast of the intersection of Highway 85 and CR 222.

Funnel Cloud in GOSHEN, WYOMING
From 12-JUN-17 15:57:00 to 12-JUN-17 16:00:00 (MST-7)
Location: LINGLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was observed seven miles north-northeast of Lingle.

Hail in GOSHEN, WYOMING
From 12-JUN-17 15:10:00 to 12-JUN-17 15:20:00 (MST-7)
Location: FORT LARAMIE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hen egg size hail was observed in northwest Fort Laramie.

Hail in LARAMIE, WYOMING
From 12-JUN-17 15:12:00 to 12-JUN-17 15:15:00 (MST-7)
Location: CHEYENNE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Ping pong ball size hail was observed 10 miles north of Cheyenne.

Hail in LARAMIE, WYOMING
From 12-JUN-17 15:15:00 to 12-JUN-17 15:18:00 (MST-7)
Location: (CYS)CHEYENNE AIRPORT
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golf ball to baseball size hail was observed at the 8600 block of Powderhouse Road north of Cheyenne.

Hail in GOSHEN, WYOMING
From 12-JUN-17 15:20:00 to 12-JUN-17 15:25:00 (MST-7)
Location: FORT LARAMIE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tennis ball to baseball size hail was observed at Fort Laramie.

Tornado in LARAMIE, WYOMING
From 12-JUN-17 15:57:00 to 12-JUN-17 16:08:00 (MST-7)
Location: CARPENTER
Tornado F-scale: EF2
Reported by: NWS Storm Survey

The tornado crossed into southern Laramie County, Wyoming from Weld County, Colorado approximately 4 miles southeast of Carpenter. It continued moving towards the north-northwest crossing mostly open farmland, paralleling County Road 151 where it impacted 4 residences. The most significant damage observed by the NWS assessment team was to 2 residences along County Road 151, where a semi-attached garage was completely destroyed (DI 1, DOD 3) by EF-2 intensity winds. Damage also was observed to single family roof structure. Additionally, numerous power poles were snapped along with a ruptured power line.

Hail in PLATTE, WYOMING
From 12-JUN-17 14:05:00 to 12-JUN-17 14:10:00 (MST-7)
Location: GUERNSEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Quarter size hail was observed six miles south of Guernsey.

Hail in PLATTE, WYOMING
From 12-JUN-17 14:11:00 to 12-JUN-17 14:15:00 (MST-7)
Location: BORDEAUX
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was observed three miles north of Bordeaux.

Hail in LARAMIE, WYOMING
From 12-JUN-17 14:30:00 to 12-JUN-17 14:50:00 (MST-7)
Location: CHEYENNE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Quarter size hail covered the ground with minor tree damage.

Hail in CONVERSE, WYOMING
From 12-JUN-17 14:45:00 to 12-JUN-17 14:55:00 (MST-7)
Location: DOUGLAS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Ping pong ball size hail dented vehicles and broke house windows.

Hail in CONVERSE, WYOMING
From 12-JUN-17 14:50:00 to 12-JUN-17 14:55:00 (MST-7)
Location: DOUGLAS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter to golf ball size hail was observed at Douglas.

Hail in LARAMIE, WYOMING
From 12-JUN-17 14:50:00 to 12-JUN-17 15:00:00 (MST-7)
Location: CHEYENNE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tennis to baseball size hail damaged numerous buildings and vehicles at FE Warren AFB.

Hail in LARAMIE, WYOMING
From 12-JUN-17 16:00:00 to 12-JUN-17 16:05:00 (MST-7)
Location: CARPENTER
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Ping pong ball size hail covered the ground four miles north-northeast of Carpenter.

Hail in CONVERSE, WYOMING
From 12-JUN-17 16:05:00 to 12-JUN-17 16:08:00 (MST-7)
Location: DOUGLAS
Magnitude: 4.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Softball size hail was observed eight miles of Douglas.

Tornado in CONVERSE, WYOMING
From 12-JUN-17 15:49:00 to 12-JUN-17 15:49:00 (MST-7)
Location: BOXELDER
Tornado F-scale: EF1
Reported by: Emergency Manager

A brief tornado spin-up occurred along Cold Springs Road southwest of Douglas. An outbuilding was completely destroyed (DI 1, DOD 8).

Tornado in LARAMIE, WYOMING
From 12-JUN-17 16:05:00 to 12-JUN-17 16:12:00 (MST-7)
Location: (82V)PINE BLUFFS AIRPORT
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A short-lived tornado touched down just north of the Colorado state line to the southwest of Pine Bluffs along County Road 161. It was on the ground for approximately 4-7 minutes. A fifth-wheel horse trailer was lofted into the air for 50 yards sustaining significant damage. A small farm outbuilding was also destroyed (DI 1, DOD 7).

Hail in LARAMIE, WYOMING
From 12-JUN-17 16:05:00 to 12-JUN-17 16:08:00 (MST-7)
Location: CARPENTER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Golf ball size hail was observed five miles north of Carpenter.

Funnel Cloud in LARAMIE, WYOMING
From 12-JUN-17 16:19:00 to 12-JUN-17 16:24:00 (MST-7)
Location: PINE BLUFFS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was observed five miles west of Pine Bluffs.

Tornado in GOSHEN, WYOMING
From 12-JUN-17 16:09:00 to 12-JUN-17 16:30:00 (MST-7)
Location: LINGLE
Tornado F-scale: EF2
Property damage: 597.00K
Reported by: NWS Storm Survey

Significant tornado damage was noted at a ranch 20 miles north-northeast of Torrington, WY, just west of the Union Pacific railway line. Significant damage consistent with EF-2 intensity winds was to the main ranch residence and surrounding barns (DI 1, DOD 8). Several three-quarter ton pickup trucks were vaulted several yards by tornadic winds, with several horse trailers rolled 50 to 100 yards and severely damaged. Several horses at this location were seriously injured with 3 horses killed. One person in the residence received minor head injuries. The tornado continued northeast, moving into Sioux County, NE at 1630 MST.