WWUS45 KRIW 210845

WSWRIW



URGENT - WINTER WEATHER MESSAGE

National Weather Service Riverton WY

245 AM MDT Tue Apr 21 2026



WYZ001-220000-

/O.NEW.KRIW.WW.Y.0016.260422T1800Z-260424T0500Z/

Yellowstone National Park-

Including the cities of Lake, Mammoth, and Old Faithful

245 AM MDT Tue Apr 21 2026



...WINTER WEATHER ADVISORY IN EFFECT FROM NOON WEDNESDAY TO 11 PM 

MDT THURSDAY...



* WHAT...Snow expected. Total snow accumulations between 6 and 12 

  inches with the highest amounts across southwestern portions of 

  the Park. Winds gusting as high as 40 mph.



* WHERE...Yellowstone National Park.



* WHEN...From noon Wednesday to 11 PM MDT Thursday.



* IMPACTS...Travel could be very difficult. 



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Slow down and use caution while traveling. 



For graphical depictions of the snowfall forecast, including the 

official NWS forecast, high end amounts, and low end amounts, visit 

https://weather.gov/riw/winter .



For current road conditions across Yellowstone National Park, visit 

https://nps.gov/yellowstone .



&&



$$



WYZ012-220000-

/O.NEW.KRIW.WW.Y.0016.260422T1800Z-260424T0500Z/

Teton and Gros Ventre Mountains-

245 AM MDT Tue Apr 21 2026



...WINTER WEATHER ADVISORY IN EFFECT FROM NOON WEDNESDAY TO 11 PM 

MDT THURSDAY...



* WHAT...Snow expected. Total snow accumulations generally between 6 

  and 12 inches with locally higher amounts to 18 inches across the 

  Tetons. Winds gusting as high as 45 mph.



* WHERE...Teton and Gros Ventre Mountains.



* WHEN...From noon Wednesday to 11 PM MDT Thursday.



* IMPACTS...Travel could be very difficult, including over Teton 

  Pass and Togwotee Pass.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Slow down and use caution while traveling. 



For graphical depictions of the snowfall forecast, including the 

official NWS forecast, high end amounts, and low end amounts, visit 

https://weather.gov/riw/winter .



For winter road conditions from the Wyoming Department of 

Transportation, visit https://wyoroad.info .



&&



$$



WYZ024-220000-

/O.NEW.KRIW.WW.Y.0016.260422T1800Z-260424T0500Z/

Salt River and Wyoming Ranges-

245 AM MDT Tue Apr 21 2026



...WINTER WEATHER ADVISORY IN EFFECT FROM NOON WEDNESDAY TO 11 PM 

MDT THURSDAY...



* WHAT...Snow expected. Total snow accumulations of 5 to 10 inches. 

  Winds gusting as high as 50 mph.



* WHERE...Salt River and Wyoming Ranges.



* WHEN...From noon Wednesday to 11 PM MDT Thursday.



* IMPACTS...Travel could be difficult, including over Salt River 

  Pass.



PRECAUTIONARY/PREPAREDNESS ACTIONS...



Slow down and use caution while traveling. 



For graphical depictions of the snowfall forecast, including the 

official NWS forecast, high end amounts, and low end amounts, visit 

https://weather.gov/riw/winter .



For winter road conditions from the Wyoming Department of 

Transportation, visit https://wyoroad.info .



&&



$$



For more information from the National Weather Service, visit 

https://weather.gov/riw/ .



Myers