WWUS45 KRIW 010747
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
147 AM MDT Wed Apr 1 2026

WYZ001-012-020000-
/O.NEW.KRIW.WS.A.0004.260402T0500Z-260404T0000Z/
Yellowstone National Park-Teton and Gros Ventre Mountains-
Including the cities of Lake, Old Faithful, and Mammoth
147 AM MDT Wed Apr 1 2026

...WINTER STORM WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY
AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations between 12
  and 18 inches possible with locally up to 24 inches in the western
  slopes of the Tetons. In northern Yellowstone Park, 6 to 10 inches
  of snow is possible. Winds could gust as high as 40 mph.

* WHERE...Teton and Gros Ventre Mountains and Yellowstone National
  Park.

* WHEN...From this evening through Friday afternoon.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

WYZ014-015-024-020000-
/O.NEW.KRIW.WS.A.0004.260402T0500Z-260404T0000Z/
Wind River Mountains West-Wind River Mountains East-Salt River
and Wyoming Ranges-
147 AM MDT Wed Apr 1 2026

...WINTER STORM WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY
AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations between 10
  and 16 inches possible. Winds could gust as high as 50 mph.

* WHERE...Wind River Mountains East, Wind River Mountains West, and
  Salt River and Wyoming Ranges.

* WHEN...From this evening through Friday afternoon.

* IMPACTS...Travel could be very difficult, including over South
  Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

WYZ008-009-020000-
/O.NEW.KRIW.WS.A.0004.260403T0000Z-260404T0000Z/
Bighorn Mountains West-Bighorn Mountains Southeast-
147 AM MDT Wed Apr 1 2026

...WINTER STORM WATCH IN EFFECT FROM THURSDAY EVENING THROUGH FRIDAY
AFTERNOON...

* WHAT...Heavy snow possible. Total snow accumulations between 12
  and 20 inches possible, with the highest amounts on the western
  slopes of the northern Bighorns. Winds could gust as high as 45
  mph.

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

* WHEN...From Thursday evening through Friday afternoon.

* IMPACTS...Travel could be very difficult, including over Granite
  and Powder River Passes.

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/ .

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