454
WWUS45 KRIW 110824
WSWRIW
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
224 AM MDT WED MAR 11 2026
WYZ001-120100-
/O.NEW.KRIW.WS.A.0002.260312T0000Z-260315T0000Z/
YELLOWSTONE NATIONAL PARK-
INCLUDING THE CITIES OF MAMMOTH, LAKE, AND OLD FAITHFUL
224 AM MDT WED MAR 11 2026
...WINTER STORM WATCH IN EFFECT FROM THIS EVENING THROUGH SATURDAY
AFTERNOON...
* WHAT...HEAVY SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS 1 TO 2 FEET
OVER THE HIGHER ELEVATIONS OF SOUTHERN AND EASTERN YNP. 6 TO 12
INCHES IN CENTRAL PORTIONS OF YELLOWSTONE MAINLY ABOVE 7,500 FT,
AND BETWEEN 1 AND 4 INCHES IN LAMAR VALLEY AND MAMMOTH. WINDS
COULD GUST AS HIGH AS 50 MPH AT TIMES.
* WHERE...YELLOWSTONE NATIONAL PARK.
* WHEN...FROM THIS EVENING THROUGH SATURDAY AFTERNOON.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT ESPECIALLY IN THE
BACKCOUNTRY.
* ADDITIONAL DETAILS...SNOWFALL WILL DIFFER IN INTENSITY OVER A 3
DAY SPAN WITH PERIODS OF MODERATE TO HEAVY SNOWFALL. PERIODIC WIND
GUSTS IN EXCESS OF 50 MPH AND SNOWFALL WILL LIKELY CREATE NEAR
WHITEOUT CONDITIONS AT TIMES. WARM TEMPERATURES DURING THE DAY
WILL LIKELY LEAD TO A TRANSITION OVER TO RAIN, MAINLY ACROSS
ELEVATIONS BELOW 7,500 FEET WITH A RETURN TO SNOW BY NIGHTFALL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MONITOR THE LATEST FORECASTS FOR UPDATES ON THIS SITUATION.
WYZ002-120100-
/O.NEW.KRIW.WS.A.0002.260312T0000Z-260315T0000Z/
ABSAROKA MOUNTAINS-
224 AM MDT WED MAR 11 2026
...WINTER STORM WATCH IN EFFECT FROM THIS EVENING THROUGH SATURDAY
AFTERNOON...
* WHAT...HEAVY SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS OF 1 TO 2
FEET WITH LOCALIZED AREAS POSSIBLY SEEING AMOUNTS NEARING 3 FEET.
EASTERN SLOPES AND ELEVATIONS BELOW 7,500 FEET LIKELY SEE TOTAL
SNOW ACCUMULATIONS OF 1 TO 4 INCHES. WINDS COULD GUST AS HIGH AS
80 MPH AT TIMES.
* WHERE...ABSAROKA MOUNTAINS.
* WHEN...FROM THIS EVENING THROUGH SATURDAY AFTERNOON.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT.
* ADDITIONAL DETAILS...SNOWFALL WILL DIFFER IN INTENSITY OVER A 3
DAY SPAN WITH PERIODS OF MODERATE TO HEAVY SNOWFALL. PERIODIC WIND
GUSTS IN EXCESS OF 80 MPH AND SNOWFALL WILL LIKELY CREATE NEAR
WHITEOUT CONDITIONS AT TIMES. WARM TEMPERATURES DURING THE DAY
WILL LIKELY LEAD TO A TRANSITION OVER TO RAIN, MAINLY ACROSS
ELEVATIONS BELOW 7,500 FEET WITH A RETURN TO SNOW BY NIGHTFALL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MONITOR THE LATEST FORECASTS FOR UPDATES ON THIS SITUATION.
WYZ012-120100-
/O.NEW.KRIW.WS.A.0002.260312T0000Z-260315T0000Z/
TETON AND GROS VENTRE MOUNTAINS-
224 AM MDT WED MAR 11 2026
...WINTER STORM WATCH IN EFFECT FROM THIS EVENING THROUGH SATURDAY
AFTERNOON...
* WHAT...HEAVY SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS OF 1 TO 2
FEET WITH LOCALIZED AREAS ALONG THE HIGHEST PEAKS POSSIBLY SEEING
AMOUNTS NEARING 3 FEET. ELEVATIONS AROUND OR BELOW 7500 FEET
LIKELY SEE LESSER AMOUNTS OF 1 TO 4 INCHES WINDS COULD GUST AS
HIGH AS 60 MPH AT TIMES.
* WHERE...TETON AND GROS VENTRE MOUNTAINS.
* WHEN...FROM THIS EVENING THROUGH SATURDAY AFTERNOON.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE MORNING AND EVENING COMMUTES ALONG TETON AND
TOGWOTEE PASSES.
* ADDITIONAL DETAILS...SNOWFALL WILL DIFFER IN INTENSITY OVER A 3
DAY SPAN WITH PERIODS OF MODERATE TO HEAVY SNOWFALL. PERIODIC WIND
GUSTS IN EXCESS OF 60 MPH AND SNOWFALL WILL LIKELY CREATE NEAR
WHITEOUT CONDITIONS AT TIMES. WARM TEMPERATURES DURING THE DAY
WILL LIKELY LEAD TO A TRANSITION OVER TO RAIN, MAINLY ACROSS
ELEVATIONS BELOW 7,500 FEET WITH A RETURN TO SNOW BY NIGHTFALL.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MONITOR THE LATEST FORECASTS FOR UPDATES ON THIS SITUATION.
WYZ014-015-120100-
/O.NEW.KRIW.WS.A.0002.260312T0000Z-260315T0000Z/
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
224 AM MDT WED MAR 11 2026
...WINTER STORM WATCH IN EFFECT FROM THIS EVENING THROUGH SATURDAY
AFTERNOON...
* WHAT...HEAVY SNOW POSSIBLE. TOTAL SNOW ACCUMULATIONS OF 1 TO 2
FEET MAINLY LIMITED TO THE NORTHERN HALF OF THE RANGE. THE
SOUTHERN PORTION OF THE RANGE MAY SEE AMOUNTS OF 3 TO 6 INCHES
MAINLY IN THE HIGHEST ELEVATIONS. ELEVATIONS BELOW 7,500 FEET AND
ALONG EASTERN SLOPES MAY SEE LESSER AMOUNTS OF 1 TO 4 INCHES.
WINDS COULD GUST AS HIGH AS 80 MPH AT TIMES.
* WHERE...WIND RIVER MOUNTAINS EAST AND WIND RIVER MOUNTAINS WEST.
* WHEN...FROM THIS EVENING THROUGH SATURDAY AFTERNOON.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT ESPECIALLY IN THE
BACKCOUNTRY. LITTLE TO NO SNOW ACCUMULATION IS FORECAST ALONG
SOUTH PASS.
* ADDITIONAL DETAILS...SNOWFALL WILL DIFFER IN INTENSITY OVER A 3
DAY SPAN WITH PERIODS OF MODERATE TO HEAVY SNOWFALL. PERIODIC WIND
GUSTS IN EXCESS OF 80 MPH AND SNOWFALL WILL LIKELY CREATE NEAR
WHITEOUT CONDITIONS AT TIMES. WARM TEMPERATURES DURING THE DAY
WILL LIKELY LEAD TO A TRANSITION OVER TO RAIN, MAINLY ACROSS
ELEVATIONS BELOW 7,500 FEET WITH A RETURN TO SNOW BY NIGHTFALL.
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/ .
DZIEWALTOWSKI
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