Strong thunderstorms and supercells formed across the high plains of southeastern Wyoming producing large hail and two confirmed tornadoes. The first tornado was rated as an EF-2 as it produced damage to residences and vehicles in Federal. A second tornado formed near the Whitaker exit along Interstate 25 though the damage done to a car but there was not a damage indicator to assign, so it was rated as EF-Unknown.

Hail in ALBANY, WYOMING
From 27-MAY-18 14:16:00 to 27-MAY-18 14:16:00 (MST-7)
Location: VEDAUWOO
Magnitude: 1.75 
Reported by: Emergency Manager

The large hail caused damage to cars and trailers in the Pole Mountain area.

Tornado in LARAMIE, WYOMING
From 27-MAY-18 15:21:00 to 27-MAY-18 15:23:00 (MST-7)
Location: FEDERAL
Tornado F-scale: EFU
Reported by: NWS Storm Survey

A car was damaged near the Whitaker exit along Interstate 25 with clear indication of tornado rotation. Without a damage indicator, however, this portion of the tornado was rated EF-Unknown.

Hail in LARAMIE, WYOMING
From 27-MAY-18 14:20:00 to 27-MAY-18 14:20:00 (MST-7)
Location: FEDERAL
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in LARAMIE, WYOMING
From 27-MAY-18 15:10:00 to 27-MAY-18 15:10:00 (MST-7)
Location: HECLA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CONVERSE, WYOMING
From 27-MAY-18 15:40:00 to 27-MAY-18 15:40:00 (MST-7)
Location: CLAYTON
Magnitude: 1.00 
Reported by: Trained Spotter

Tornado in PLATTE, WYOMING
From 27-MAY-18 15:05:00 to 27-MAY-18 15:20:00 (MST-7)
Location: GLENDO
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado reported nine miles south of Glendo moving northeast through northern Platte County. Mainly open prairie grasslands made it impossible to determine a full path and any EF rating other than unknown.

Hail in GOSHEN, WYOMING
From 27-MAY-18 16:50:00 to 27-MAY-18 16:50:00 (MST-7)
Location: MERS HILL
Magnitude: 0.88 
Reported by: Trained Spotter

Tornado in LARAMIE, WYOMING
From 27-MAY-18 13:43:00 to 27-MAY-18 14:00:00 (MST-7)
Location: HECLA
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Tornado spotted north of Highway 210 by Curt Gowdy State Park staffer. Estimated distance between observer and tornado was 2 to 3 miles.

Hail in ALBANY, WYOMING
From 27-MAY-18 13:17:00 to 27-MAY-18 13:17:00 (MST-7)
Location: VEDAUWOO
Magnitude: 1.75 
Reported by: Storm Chaser

Hail in ALBANY, WYOMING
From 27-MAY-18 13:31:00 to 27-MAY-18 13:31:00 (MST-7)
Location: VEDAUWOO
Magnitude: 1.00 
Reported by: Storm Chaser

Hail in ALBANY, WYOMING
From 27-MAY-18 13:35:00 to 27-MAY-18 13:35:00 (MST-7)
Location: VEDAUWOO
Magnitude: 2.50 
Reported by: Storm Chaser

Tornado in ALBANY, WYOMING
From 27-MAY-18 13:43:00 to 27-MAY-18 14:00:00 (MST-7)
Location: BUFORD
Tornado F-scale: EFU
Reported by: Park/Forest Service

Tornado spotted north of Highway 210 by Curt Gowdy State Park staffer. Estimated distance between observer and tornado was 2 to 3 miles.

Tornado in LARAMIE, WYOMING
From 27-MAY-18 14:20:00 to 27-MAY-18 14:32:00 (MST-7)
Location: FEDERAL
Tornado F-scale: EF2
Reported by: NWS Storm Survey

Significant tornado damage was noted near Federal, Wyoming where eight structures were impacted along Mountain Shadow Drive and Mountain Shadow Lane. The tornado initially touched down just northeast of Federal, tracking south, before lifting south of Federal. Significant damage consistent with a EF-2 tornado was observed to a manufactured home just east of Federal, where the roof had been removed, garage destroyed, while exterior walls were left attached to the foundation and intact. The tornado continued south tossing numerous livestock and camper trailers. High-end EF-2 damage was observed to a single family residence farther south, where the roof and a few exterior walls were removed. A garage and exterior shed was also destroyed at the residence. The tornado continued south removing the roof of another home half a miles southeast of Federal. Numerous damage to roofs around the area was also noted.