WWUS45 KRIW 211809
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1209 PM MDT Tue Apr 21 2026

WYZ001-221300-
/O.CON.KRIW.WW.Y.0016.260422T1800Z-260424T0500Z/
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
1209 PM MDT Tue Apr 21 2026

...WINTER WEATHER ADVISORY REMAINS 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.

* ADDITIONAL DETAILS...Total snow amounts up to 3 inches at Mammoth.

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.

&&

$$

WYZ012-221300-
/O.CON.KRIW.WW.Y.0016.260422T1800Z-260424T0500Z/
Teton and Gros Ventre Mountains-
1209 PM MDT Tue Apr 21 2026

...WINTER WEATHER ADVISORY REMAINS 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.

&&

$$

WYZ024-221300-
/O.CON.KRIW.WW.Y.0016.260422T1800Z-260424T0500Z/
Salt River and Wyoming Ranges-
1209 PM MDT Tue Apr 21 2026

...WINTER WEATHER ADVISORY REMAINS 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/ .

Wittmann