WWUS45 KRIW 130812
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
212 AM MDT Fri Mar 13 2026

WYZ001-132315-
/O.NEW.KRIW.WS.A.0003.260314T1200Z-260315T0500Z/
Yellowstone National Park-
Including the cities of Mammoth, Old Faithful, and Lake
212 AM MDT Fri Mar 13 2026

...WINTER STORM WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

* WHAT...Heavy snow possible. Total snow accumulations of 10 to 15
  inches over southern portions and far eastern portions; 3 to 6
  inches in central portions and 1 to 4 inches in Lamar Valley and
  Mammoth. Winds could gust as high as 50 mph.

* WHERE...Yellowstone National Park.

* WHEN...From Saturday morning through Saturday evening.

* IMPACTS...Travel could be difficult, especially in the backcountry.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

WYZ002-012-132315-
/O.NEW.KRIW.WS.A.0003.260314T1200Z-260315T0500Z/
Absaroka Mountains-Teton and Gros Ventre Mountains-
212 AM MDT Fri Mar 13 2026

...WINTER STORM WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

* WHAT...Heavy snow possible. Total snow accumulations between 10
  and 15 inches possible, with locally higher amounts up to 20
  inches over the western slopes of the Absarokas. Winds could gust
  as high as 70 mph on the eastern slopes, especially toward the
  Washakie Needles.

* WHERE...Absaroka Mountains and Teton and Gros Ventre Mountains.

* WHEN...From Saturday morning through Saturday evening.

* IMPACTS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

WYZ008-009-132315-
/O.NEW.KRIW.WS.A.0003.260314T1200Z-260315T1200Z/
Bighorn Mountains West-Bighorn Mountains Southeast-
212 AM MDT Fri Mar 13 2026

...WINTER STORM WATCH IN EFFECT FROM SATURDAY MORNING THROUGH LATE
SATURDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations between 8 and
  12 inches possible on the northern end of the mountains.
  Accumulations of 3 to 6 inches possible along Powder River Pass.
  Winds could gust as high as 55 mph.

* WHERE...Bighorn Mountains Southeast and Bighorn Mountains West.

* WHEN...From Saturday morning through late Saturday night.

* IMPACTS...Travel could be difficult over Powder River Pass and
  Granite Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

For more information from the National Weather Service, visit
https://weather.gov/riw/ .

TL