An intense, long-lived supercell initially developed near the town of Chugwater over the higher terrain of the central Laramie Range around 3:00 PM on 6/23, tracking to the east-southeast across southern Platte and Goshen Counties through approximately 7:00 PM. A small, terrain-driven area of low pressure and resultant cyclonic flow resulted in moisture pooling and backed, easterly near-surface flow near the track of the storm which resulted in a favorable environment for tornadoes. The cyclic supercell produced 5 separate confirmed tornadoes, most notably including an EF-2 tornado which developed near the town of Hawk Springs. A swath of large hail up to two inches in diameter also occurred with this storm. A separate storm over far northwestern Converse County also produced a brief tornado that afternoon. A second round of strong to severe thunderstorms impacted Platte and Goshen Counties later in the day.

Hail in PLATTE, WYOMING
From 23-JUN-23 15:12:00 to 23-JUN-23 15:12:00 (MST-7)
Location: SLATER
Magnitude: 1.75 
Reported by: Trained Spotter

A trained weather spotter reported golf ball sized hail along I-25 at Slater Road.

Hail in PLATTE, WYOMING
From 23-JUN-23 15:18:00 to 23-JUN-23 15:18:00 (MST-7)
Location: SLATER
Magnitude: 2.00 
Reported by: Public

Hen Egg sized hail was reported 6 miles N of Chugwater via mPING.

Hail in PLATTE, WYOMING
From 23-JUN-23 15:30:00 to 23-JUN-23 15:30:00 (MST-7)
Location: CHUGWATER
Magnitude: 1.75 
Reported by: Public

Golf ball sized hail was reported 4 miles NE of Chugwater via mPING.

Hail in PLATTE, WYOMING
From 23-JUN-23 15:17:00 to 23-JUN-23 15:17:00 (MST-7)
Location: SIBYLEE
Magnitude: 1.50 
Reported by: Storm Chaser

A storm chaser reported ping-pong ball sized hail 2 miles NNW of Wheatland.

Hail in PLATTE, WYOMING
From 23-JUN-23 15:25:00 to 23-JUN-23 15:25:00 (MST-7)
Location: SIBYLEE
Magnitude: 1.00 
Reported by: Public

Quarter sized hail was reported 2 miles N of Wheatland via mPING.

Hail in GOSHEN, WYOMING
From 23-JUN-23 18:18:00 to 23-JUN-23 18:18:00 (MST-7)
Location: ROCKEAGLE
Magnitude: 1.75 
Reported by: Public

Golf ball sized hail was reported 8 miles S of Fort Laramie.

Tornado in GOSHEN, WYOMING
From 23-JUN-23 17:03:00 to 23-JUN-23 17:04:00 (MST-7)
Location: FONDA
Tornado F-scale: EFU
Reported by: NWS Storm Survey

Numerous photos and video from storm spotters of a brief tornado touchdown over open country. No damage was reported. Confirmed by official NWS Storm Survey.

Tornado in GOSHEN, WYOMING
From 23-JUN-23 17:21:00 to 23-JUN-23 17:37:00 (MST-7)
Location: HAWK SPRINGS
Tornado F-scale: EF2
Property damage: 100.00K
Reported by: NWS Storm Survey

A large cone tornado developed just east of US-85 south of Hawk Springs, before quickly becoming rain-wrapped. The tornado snapped cottonwood trees, with a tree branch impaling a stucco house. It also damaged outbuildings and snapped power poles. An injury occurred when the tornado flipped an 18-wheeler and injured the driver. The same tornado tracked to the southeast and damaged another outbuilding and a barn 3 miles southeast of Hawk Springs. The tornado was officially rated an EF-2. In addition to the tornado damage, straight-line winds from the Rear Flank Downdraft (RFD) damaged several hardwood trees. This is consistent with 100 MPH winds.

Tornado in PLATTE, WYOMING
From 23-JUN-23 16:11:00 to 23-JUN-23 16:11:00 (MST-7)
Location: CHUGWATER
Tornado F-scale: EFU
Reported by: NWS Storm Survey

Trained spotters reported a brief (10-second) tornado touchdown just east of the town of Chugwater. The tornado remained over open country. Confirmed by official NWS Storm Survey.

Tornado in GOSHEN, WYOMING
From 23-JUN-23 16:29:00 to 23-JUN-23 16:37:00 (MST-7)
Location: MERS HILL
Tornado F-scale: EFU
Reported by: NWS Storm Survey

Numerous photos and videos of a cone tornado with occasional touchdowns along a roughly 3-mile path to the east of Chugwater just east of the Platte/Goshen County line. The tornado remained over open country with no damage reported. Confirmed by official NWS Storm Survey.

Hail in PLATTE, WYOMING
From 23-JUN-23 16:15:00 to 23-JUN-23 16:15:00 (MST-7)
Location: SLATER
Magnitude: 1.50 
Reported by: Public

Ping-pong ball sized hail was reported 8 miles N of Chugwater via mPING.

Hail in PLATTE, WYOMING
From 23-JUN-23 16:22:00 to 23-JUN-23 16:22:00 (MST-7)
Location: SLATER
Magnitude: 2.25 
Reported by: Storm Chaser

A storm chaser observed 2.25 inch diameter hail 8 miles NE of Chugwater.

Tornado in GOSHEN, WYOMING
From 23-JUN-23 17:44:00 to 23-JUN-23 17:58:00 (MST-7)
Location: HAWK SPRINGS
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Official NWS Storm Survey confirms an EF-1 tornado which bent free-standing light and flag poles along its path, also collapsing the walls of a small outbuilding.

Hail in PLATTE, WYOMING
From 23-JUN-23 15:54:00 to 23-JUN-23 15:54:00 (MST-7)
Location: CHUGWATER
Magnitude: 1.50 
Reported by: Storm Chaser

A storm chaser located 4 miles N of Chugwater reported ping-pong ball sized hail.

Tornado in CONVERSE, WYOMING
From 23-JUN-23 15:33:00 to 23-JUN-23 15:33:00 (MST-7)
Location: ROSS
Tornado F-scale: EFU
Reported by: Public

The public reported a tornado near the Converse and Natrona County line approximately 33 miles WNW of Bill.

Hail in PLATTE, WYOMING
From 23-JUN-23 16:04:00 to 23-JUN-23 16:04:00 (MST-7)
Location: CHUGWATER
Magnitude: 1.75 
Reported by: Storm Chaser

A storm chaser reported golf ball sized hail 4 miles NE of Chugwater.