832
WWUS45 KMSO 211950
WSWMSO
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
150 PM MDT TUE APR 21 2026
IDZ006-241800-
/O.NEW.KMSO.WW.Y.0021.260423T0000Z-260424T1800Z/
SOUTHERN CLEARWATER MOUNTAINS-
1250 PM PDT TUE APR 21 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM WEDNESDAY TO 11 AM
PDT FRIDAY ABOVE 4000 FEET...
* WHAT...SNOW EXPECTED ABOVE 4000 FEET. THERE IS A LIKELIHOOD OF
MODERATE WINTER WEATHER IMPACTS. TOTAL SNOW ACCUMULATIONS OF 1 TO
4 INCHES BELOW 5000 FEET, 6 TO 10 INCHES AT PASS LEVEL AND OVER 12
INCHES IN THE HIGH TERRAIN.
* WHERE...ELK CITY AND DIXIE.
* WHEN...FROM 5 PM WEDNESDAY TO 11 AM PDT FRIDAY.
* IMPACTS...FOR MODERATE WINTER WEATHER IMPACTS, EXPECT DISRUPTIONS
TO NORMAL ACTIVITIES. HAZARDOUS TRAVELING CONDITIONS. USE EXTRA
CAUTION WHILE DRIVING. CLOSURES AND DISRUPTIONS TO INFRASTRUCTURE
MAY OCCUR. THE HAZARDOUS CONDITIONS COULD IMPACT THE WEDNESDAY
EVENING AND THURSDAY MORNING COMMUTES, ESPECIALLY OVER HIGHER
PASSES.
* ADDITIONAL DETAILS...LOWER ELEVATION SNOW ACCUMULATIONS ARE MOST
LIKELY THURSDAY NIGHT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. THE LATEST ROAD
CONDITIONS FOR THE STATE YOU ARE CALLING FROM CAN BE OBTAINED BY
CALLING 5 1 1.
IDZ009-010-241800-
/O.NEW.KMSO.WW.Y.0021.260423T0000Z-260424T1800Z/
WESTERN LEMHI COUNTY-EASTERN LEMHI COUNTY-
150 PM MDT TUE APR 21 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM WEDNESDAY TO NOON MDT
FRIDAY...
* WHAT...SNOW EXPECTED. THERE IS A LIKELIHOOD OF MINOR TO MODERATE
WINTER WEATHER IMPACTS. TOTAL SNOW ACCUMULATIONS BETWEEN 1 TO 3
INCHES IN THE VALLEYS, 5 TO 10 INCHES AT PASS LEVEL AND OVER 12
INCHES IN THE HIGH TERRAIN.
* WHERE...SALMON, BANNOCK PASS, SHOUP, WILLIAMS CREEK SUMMIT,
HIGHWAY 28 TENDOY TO LONE PINE, LEMHI PASS, AND HIGHWAY 93 LOST
TRAIL PASS TO GIBBONSVILLE.
* WHEN...FROM 6 PM WEDNESDAY TO NOON MDT FRIDAY.
* IMPACTS...FOR MODERATE WINTER WEATHER IMPACTS, EXPECT DISRUPTIONS
TO NORMAL ACTIVITIES. HAZARDOUS TRAVELING CONDITIONS. USE EXTRA
CAUTION WHILE DRIVING. CLOSURES AND DISRUPTIONS TO INFRASTRUCTURE
MAY OCCUR. THE HAZARDOUS CONDITIONS COULD IMPACT THE THURSDAY
MORNING AND EVENING COMMUTES, ESPECIALLY OVER HIGHER PASSES.
* ADDITIONAL DETAILS...VALLEY ACCUMULATIONS ARE MOST LIKELY THURSDAY
NIGHT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. THE LATEST ROAD
CONDITIONS FOR THE STATE YOU ARE CALLING FROM CAN BE OBTAINED BY
CALLING 5 1 1.
MTZ002-240000-
/O.NEW.KMSO.WW.Y.0021.260423T0000Z-260424T0000Z/
WEST GLACIER REGION-
150 PM MDT TUE APR 21 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM WEDNESDAY TO 6 PM MDT
THURSDAY...
* WHAT...SNOW EXPECTED. THERE IS A LIKELIHOOD OF MODERATE WINTER
WEATHER IMPACTS. TOTAL SNOW ACCUMULATIONS OF 1 TO 3 INCHES BELOW
4000 FEET, 4 TO 7 INCHES AT PASS LEVEL AND OVER 10 INCHES IN THE
HIGH TERRAIN.
* WHERE...GLACIER NATIONAL PARK, MARIAS PASS, BAD ROCK CANYON,
ESSEX, HIGHWAY 83 BIGFORK TO SWAN LAKE, AND POLEBRIDGE.
* WHEN...FROM 6 PM WEDNESDAY TO 6 PM MDT THURSDAY.
* IMPACTS...FOR MODERATE WINTER WEATHER IMPACTS, EXPECT DISRUPTIONS
TO NORMAL ACTIVITIES. HAZARDOUS TRAVELING CONDITIONS. USE EXTRA
CAUTION WHILE DRIVING. CLOSURES AND DISRUPTIONS TO INFRASTRUCTURE
MAY OCCUR. THE HAZARDOUS CONDITIONS COULD IMPACT THE THURSDAY
MORNING AND EVENING COMMUTES, ESPECIALLY OVER HIGHER PASSES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. THE LATEST ROAD
CONDITIONS FOR THE STATE YOU ARE CALLING FROM CAN BE OBTAINED BY
CALLING 5 1 1.
MTZ006-241800-
/O.NEW.KMSO.WW.Y.0021.260423T0000Z-260424T1800Z/
BITTERROOT/SAPPHIRE MOUNTAINS-
150 PM MDT TUE APR 21 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM WEDNESDAY TO NOON MDT
FRIDAY...
* WHAT...SNOW EXPECTED. THERE IS A LIKELIHOOD OF MODERATE WINTER
WEATHER IMPACTS. TOTAL SNOW ACCUMULATIONS OF 1 TO 5 INCHES BELOW
4000 FEET, 6 TO 10 INCHES AT PASS LEVEL AND OVER 12 INCHES IN THE
HIGH TERRAIN.
* WHERE...HIGHWAY 93 SULA TO LOST TRAIL PASS AND LOLO PASS.
* WHEN...FROM 6 PM WEDNESDAY TO NOON MDT FRIDAY.
* IMPACTS...FOR MODERATE WINTER WEATHER IMPACTS, EXPECT DISRUPTIONS
TO NORMAL ACTIVITIES. HAZARDOUS TRAVELING CONDITIONS. USE EXTRA
CAUTION WHILE DRIVING. CLOSURES AND DISRUPTIONS TO INFRASTRUCTURE
MAY OCCUR. THE HAZARDOUS CONDITIONS COULD IMPACT THE THURSDAY
MORNING AND EVENING COMMUTES, ESPECIALLY OVER HIGHER PASSES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. THE LATEST ROAD
CONDITIONS FOR THE STATE YOU ARE CALLING FROM CAN BE OBTAINED BY
CALLING 5 1 1.
MTZ007-241800-
/O.NEW.KMSO.WW.Y.0021.260423T0000Z-260424T1800Z/
BUTTE/BLACKFOOT REGION-
150 PM MDT TUE APR 21 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM WEDNESDAY TO NOON MDT
FRIDAY...
* WHAT...SNOW EXPECTED. THERE IS A LIKELIHOOD OF MODERATE TO
ISOLATED MAJOR WINTER WEATHER IMPACTS. TOTAL SNOW ACCUMULATIONS OF
2 AND 5 INCHES IN THE VALLEYS, 5 TO 10 INCHES AT PASS LEVEL, AND
OVER 12 INCHES IN THE HIGH TERRAIN. WINDS GUSTING AS HIGH AS 35
MPH.
* WHERE...GEORGETOWN LAKE, BUTTE, HIGHWAY 12 GARRISON TO ELLISTON,
MACDONALD PASS, AND HOMESTAKE PASS.
* WHEN...FROM 6 PM WEDNESDAY TO NOON MDT FRIDAY.
* IMPACTS...FOR MODERATE WINTER WEATHER IMPACTS, EXPECT DISRUPTIONS
TO NORMAL ACTIVITIES. HAZARDOUS TRAVELING CONDITIONS. USE EXTRA
CAUTION WHILE DRIVING. CLOSURES AND DISRUPTIONS TO INFRASTRUCTURE
MAY OCCUR. FOR MAJOR WINTER WEATHER IMPACTS, EXPECT CONSIDERABLE
DISRUPTIONS TO NORMAL ACTIVITIES. DANGEROUS OR IMPOSSIBLE
TRAVELING CONDITIONS. AVOID TRAVEL IN THE IMPACTED AREAS IF
POSSIBLE. WIDESPREAD CLOSURES AND DISRUPTIONS TO INFRASTRUCTURE
MAY OCCUR. THE HAZARDOUS CONDITIONS COULD IMPACT THE THURSDAY
MORNING AND EVENING COMMUTES, ESPECIALLY OVER HIGHER PASSES.
* ADDITIONAL DETAILS...THE MOST IMPACTFUL SNOW ACCUMULATIONS ARE
MOST LIKELY TO OCCUR THURSDAY EVENING THROUGH FRIDAY MORNING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. THE LATEST ROAD
CONDITIONS FOR THE STATE YOU ARE CALLING FROM CAN BE OBTAINED BY
CALLING 5 1 1.
MTZ043-241800-
/O.NEW.KMSO.WW.Y.0021.260423T0000Z-260424T1800Z/
POTOMAC/SEELEY LAKE REGION-
150 PM MDT TUE APR 21 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM WEDNESDAY TO NOON MDT
FRIDAY...
* WHAT...SNOW EXPECTED. THERE IS A LIKELIHOOD OF MODERATE TO
ISOLATED MAJOR WINTER WEATHER IMPACTS. TOTAL SNOW ACCUMULATIONS OF
2 AND 4 INCHES IN THE VALLEYS AND 6 TO 12 INCHES IN THE MOUNTAINS.
* WHERE...HIGHWAY 200 BONNER TO GREENOUGH, I-90 EAST MISSOULA TO
BEARMOUTH, AND HIGHWAY 83 SEELEY LAKE TO CONDON.
* WHEN...FROM 6 PM WEDNESDAY TO NOON MDT FRIDAY.
* IMPACTS...FOR MODERATE WINTER WEATHER IMPACTS, EXPECT DISRUPTIONS
TO NORMAL ACTIVITIES. HAZARDOUS TRAVELING CONDITIONS. USE EXTRA
CAUTION WHILE DRIVING. CLOSURES AND DISRUPTIONS TO INFRASTRUCTURE
MAY OCCUR. FOR MAJOR WINTER WEATHER IMPACTS, EXPECT CONSIDERABLE
DISRUPTIONS TO NORMAL ACTIVITIES. DANGEROUS OR IMPOSSIBLE
TRAVELING CONDITIONS. AVOID TRAVEL IN THE IMPACTED AREAS IF
POSSIBLE. WIDESPREAD CLOSURES AND DISRUPTIONS TO INFRASTRUCTURE
MAY OCCUR. THE HAZARDOUS CONDITIONS COULD IMPACT THE THURSDAY
MORNING AND EVENING COMMUTES, ESPECIALLY OVER HIGHER PASSES.
* ADDITIONAL DETAILS...THE MOST IMPACTFUL SNOW ACCUMULATIONS ARE
MOST LIKELY TO OCCUR THURSDAY EVENING THROUGH FRIDAY MORNING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. THE LATEST ROAD
CONDITIONS FOR THE STATE YOU ARE CALLING FROM CAN BE OBTAINED BY
CALLING 5 1 1.
JK
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