528 

WWUS45 KCYS 182338

WSWCYS



URGENT - WINTER WEATHER MESSAGE

National Weather Service Cheyenne WY

538 PM MDT Mon May 18 2026



WYZ103-104-109-112-114-116-190045-

/O.EXP.KCYS.WS.W.0007.000000T0000Z-260519T0000Z/

North Laramie Range-Ferris/Seminoe/Shirley Mountains-Central

Carbon County-Sierra Madre Range-Snowy Range-South Laramie Range-

Including the cities of Garrett, Seminoe Dam, Centennial, Pumpkin

Vine, Buford, Rawlins, Albany, and Vedauwoo

538 PM MDT Mon May 18 2026



...WINTER STORM WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...



Snow has ended or will be coming to an end shortly, use caution 

while driving as roads may become and/or stay slick as temperatures 

drop.



$$



WYZ101-105-106-110-111-115-117-190045-

/O.EXP.KCYS.WW.Y.0017.000000T0000Z-260519T0000Z/

Converse County Lower Elevations-Shirley Basin-Central Laramie

Range and Southwest Platte County-North Snowy Range Foothills-

Southwest Carbon County-Laramie Valley-South Laramie Range

Foothills-

Including the cities of Bordeaux, Deer Creek, Horse Creek, Baggs,

Glenrock, Bosler, Arlington, Bill, Whitaker, Federal, Laramie,

Shirley Basin, Elk Mountain, Medicine Bow, and Douglas

538 PM MDT Mon May 18 2026



...WINTER WEATHER ADVISORY WILL EXPIRE AT 6 PM MDT THIS EVENING...



Snow has ended or will be coming to an end shortly, use caution 

while driving as roads may become and/or stay slick as temperatures 

drop.



$$



RZ






162 

WWUS45 KRIW 182349

WSWRIW



URGENT - WINTER WEATHER MESSAGE

National Weather Service Riverton WY

549 PM MDT Mon May 18 2026



WYZ015-018>020-022-030-190100-

/O.EXP.KRIW.WS.W.0005.000000T0000Z-260519T0000Z/

Wind River Mountains East-Lander Foothills-Green Mountains and

Rattlesnake Range-Natrona County Lower Elevations-Casper Mountain-

East Sweetwater County-

Including the cities of Lander, Wamsutter, Jeffrey City, and

Casper

549 PM MDT Mon May 18 2026



...WINTER STORM WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...



Accumulating snow has ended and gusty northeast wind has 

substantially decreased. Therefore, the winter storm warning will be 

allowed to expire at 6 PM Monday.



$$



WYZ014-026>029-190100-

/O.EXP.KRIW.WW.Y.0019.000000T0000Z-260519T0000Z/

Wind River Mountains West-Upper Green River Basin-South Lincoln

County-Rock Springs and Green River-Flaming Gorge-

Including the cities of Farson, Cokeville, Big Piney, La Barge,

Green River, Kemmerer, and Rock Springs

549 PM MDT Mon May 18 2026



...WINTER WEATHER ADVISORY WILL EXPIRE AT 6 PM MDT THIS EVENING...



Light snow may continue through 9 or 10 PM Monday across the lower 

elevations of mainly Sublette County. However, with temperatures 

hovering between 29 and 34 degrees accumulations would be light. 

Therefore, the winter weather advisory will be allowed to expire at 

6 PM Monday.



$$



For more information from the National Weather Service, visit 

https://weather.gov/riw/ .



CNJ