Thunderstorms across much of southeast Wyoming produced widespread large hail as well as some flash flooding from torrential rainfall.  The worst flooding occurred during the predawn hours across southern Niobrara County from Manville to Lusk to Van Tassel.

Hail in PLATTE, WYOMING
From 04-JUN-15 14:40:00 to 04-JUN-15 14:45:00 (MST-7)
Location: WHEATLAND
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter to half dollar size hail was observed six miles south of Glendo State Park.

Hail in LARAMIE, WYOMING
From 04-JUN-15 13:24:00 to 04-JUN-15 13:29:00 (MST-7)
Location: HORSE CREEK
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Ping pong ball size hail was observed 12 miles south-southeast of Horse Creek.

Hail in LARAMIE, WYOMING
From 04-JUN-15 13:29:00 to 04-JUN-15 13:34:00 (MST-7)
Location: CHEYENNE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Golf ball size hail was reported 13 miles northwest of Cheyenne.

Hail in LARAMIE, WYOMING
From 04-JUN-15 13:29:00 to 04-JUN-15 13:34:00 (MST-7)
Location: HORSE CREEK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Quarter size hail was observed one mile southeast of Horse Creek.

Flash Flood in NIOBRARA, WYOMING
From 04-JUN-15 01:15:00 to 04-JUN-15 15:15:00 (MST-7)
Location: VAN TASSELL
Flood cause: Heavy Rain
Property damage: 1.50M
Crop damage: 0.00K
Reported by: Emergency Manager

As much as eight inches of rain fell from slow moving thunderstorms across south and southeast Niobrara County during the predawn hours, which resulted in widespread flash flooding.  Excessive runoff upstream into the Niobrara River and nearby creeks caused them to overflow their banks.  Law enforcement officials evacuated residents of Lusk as well as those living along the Niobrara River downstream to Van Tassel several hours in advance of the flood wave.  The worst damage occurred in Lusk where 20 to 30 homes and 15 to 20 businesses were destroyed.  Flood waters and debris rushed down Main Street in Lusk, swamped four blocks, and shut down the town's water supply.  The US Highway 85 bridge on the north side of Lusk collapsed onto the railroad tracks below.  Flash flooding closed a 20-mile stretch of US Highway 20 from Lusk to the Nebraska border, US Highway 85 from Lusk to the Goshen County line, and a 35-mile stretch of Highway 270 from Manville north to Lance Creek. WYDOT closed traffic into and out of Lusk, except for residents and emergency responders.  Various state agencies, including the Red Cross and Wyoming National Guard, assisted in the flood cleanup efforts.  A local command center was established at the Lusk Fairgrounds with water, food and shelter.  The governor declared a state of emergency for Niobrara County.  Fortunately, there were no injuries or fatalities.

Hail in LARAMIE, WYOMING
From 04-JUN-15 13:31:00 to 04-JUN-15 13:36:00 (MST-7)
Location: FEDERAL
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Ping pong ball size hail was observed one mile north of Federal.

Hail in PLATTE, WYOMING
From 04-JUN-15 13:31:00 to 04-JUN-15 13:35:00 (MST-7)
Location: WHEATLAND
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Ping pong ball size hail was observed four miles north of Wheatland.

Hail in LARAMIE, WYOMING
From 04-JUN-15 18:16:00 to 04-JUN-15 18:20:00 (MST-7)
Location: CHEYENNE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Half dollar size hail was observed 20 miles west of Cheyenne.

Hail in LARAMIE, WYOMING
From 04-JUN-15 18:45:00 to 04-JUN-15 18:48:00 (MST-7)
Location: FEDERAL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported 19 miles northwest of Cheyenne.

Hail in ALBANY, WYOMING
From 04-JUN-15 20:38:00 to 04-JUN-15 20:43:00 (MST-7)
Location: BOSLER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was observed at Bosler.

Hail in PLATTE, WYOMING
From 04-JUN-15 17:40:00 to 04-JUN-15 17:45:00 (MST-7)
Location: WESTVIEW CIRCLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported 12 miles southwest of Westview Circle.

Hail in CONVERSE, WYOMING
From 04-JUN-15 17:38:00 to 04-JUN-15 17:42:00 (MST-7)
Location: DOUGLAS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Half dollar size hail was reported 12 miles north-northwest of Douglas.

Hail in LARAMIE, WYOMING
From 04-JUN-15 18:10:00 to 04-JUN-15 18:15:00 (MST-7)
Location: CHEYENNE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Quarter size hail was observed 15 miles west of Cheyenne.

Hail in PLATTE, WYOMING
From 04-JUN-15 15:16:00 to 04-JUN-15 15:21:00 (MST-7)
Location: WHEATLAND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golf ball size hail was observed nine miles west-northwest of Wheatland.

Hail in PLATTE, WYOMING
From 04-JUN-15 16:10:00 to 04-JUN-15 16:15:00 (MST-7)
Location: WHEATLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was observed six miles west of Wheatland.

Hail in PLATTE, WYOMING
From 04-JUN-15 16:30:00 to 04-JUN-15 16:35:00 (MST-7)
Location: WHEATLAND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golf ball size hail was observed 11 miles west-southwest of Wheatland.

Hail in PLATTE, WYOMING
From 04-JUN-15 16:38:00 to 04-JUN-15 16:43:00 (MST-7)
Location: WHEATLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was observed eight miles west of Wheatland.

Hail in PLATTE, WYOMING
From 04-JUN-15 16:50:00 to 04-JUN-15 16:55:00 (MST-7)
Location: WHEATLAND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golf ball size hail was observed three miles northwest of Wheatland.

Hail in CONVERSE, WYOMING
From 04-JUN-15 17:00:00 to 04-JUN-15 17:05:00 (MST-7)
Location: DOUGLAS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Half dollar size hail was reported seven miles east-southeast of Douglas.

Flash Flood in PLATTE, WYOMING
From 04-JUN-15 19:55:00 to 04-JUN-15 20:55:00 (MST-7)
Location: LAKEVIEW NORTH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two to four inches of rain in less than two hours caused flash flooding northwest of Wheatland.  More than six inches of water closed Fairview, Bluffview and Brookie Roads.

Hail in PLATTE, WYOMING
From 04-JUN-15 15:00:00 to 04-JUN-15 15:05:00 (MST-7)
Location: WHEATLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported four miles west-northwest of Wheatland.

Hail in ALBANY, WYOMING
From 04-JUN-15 18:16:00 to 04-JUN-15 18:20:00 (MST-7)
Location: BOSLER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was reported 16 miles north-northwest of Iron Mountain.