National Weather Service Raw Text Product

Displaying AFOS PIL: PNSCYS Received: 2018-05-28 22:32 UTC

NOUS45 KCYS 282232

Public Information Statement
National Weather Service Cheyenne, WY
432 PM MDT Mon May 28 2018


A large supercell thunderstorm developed near the Interstate 80 
Summit during the early afternoon hours on 05/27/18. Initial 
reports of large hail were received at around 1415 MDT. This 
severe thunderstorm lifted northeast into western portions of 
Laramie county spawning its first tornado at around 1443 MDT north
of Buford, WY. This tornado producing severe thunderstorm 
continuing lifting northeast recycling numerous times. Although 
much of the life-cycle of the tornado was spent over open country
causing no damage, significant damage occurred in the vicinity of
Federal, WY, 17 miles northwest of Cheyenne. The tornado 
continued over open country and crossed Interstate 25 near the 
Whitaker exit producing damage to a vehicle. With no damage 
indicator as it crossed Interstate 25, this portion of this 
cyclical tornado was rated EF-Unknown. Although the tornado likely
continued periodically east of Interstate 25 before lifting, 
there were no additional reports of structures impacted or other 


Rating:                 EF-2
Estimated peak wind:    111-135 mph
Path length /Statute/:  1 mile
Path width /Maximum/:   500 yards
Fatalities:             0
Injuries:               0

Start date:             05/27/2018 
Start time:             1520 MDT
Start location:         .5 NNE OF FEDERAL / LARAMIE COUNTY / WY
Start Lat/Lon:          41.27471 / -105.108918

End date:               05/27/2018
End time:               1532 MDT
End location:           .5 S OF FEDERAL / LARAMIE COUNTY / WY
End_lat/lon:            41.25894 / -105.11148

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 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 a another home .5 
southeast of Federal. Numerous damage to roofs around the area 
was also noted. Debris was strewn at a width of approximately 500 
yards in width. 


Rating: 				EF-Unknown
Estimated peak wind: 	Unknown 
Path length /Statute/:  Unknown 
Path width /Maximum/: 	Unknown 
Fatalities: 			0 
Injuries: 				0

Start date:             05/27/2018 
Start time:             1621 MDT
Start location: 		19 NNW CHEYENNE, WY / LARAMIE COUNTY / WY 
Start Lat/Lon:			41.40073 / -104.88017

End date:               05/27/2018
End time:               1623 MDT
End location:           19 NNW CHEYENNE, WY / LARAMIE COUNTY / WY
End_lat/lon:            41.40238 / -104.86799

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

EF Scale: The Enhanced Fujita Scale Classifies Tornadoes into the
following categories.

EF0...Weak......65 to 85 mph
EF1...Weak......86 to 110 mph
EF2...Strong....111 to 135 mph
EF3...Strong....136 to 165 mph
EF4...Violent...166 To 200 mph
EF5...Violent...>200 mph

The information in this statement is PRELIMINARY and subject to
change pending final review of the event and publication in NWS 
Storm Data.