564
WWUS45 KMSO 180210
WSWMSO
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
710 PM MST WED DEC 17 2025
MTZ002-201800-
/O.CAN.KMSO.WS.W.0013.000000T0000Z-251218T0600Z/
/O.EXA.KMSO.WW.Y.0049.251218T2000Z-251220T1800Z/
WEST GLACIER REGION-
710 PM MST WED DEC 17 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 1 PM THURSDAY TO 11 AM MST
SATURDAY...
* WHAT...SNOW EXPECTED. THERE IS A LIKELIHOOD OF MODERATE TO
ISOLATED MAJOR WINTER WEATHER IMPACTS. TOTAL SNOW ACCUMULATIONS
BETWEEN 6 AND 8 INCHES AT MARIAS PASS, 2 AND 4 INCHES AT WEST
GLACIER, AND 8 TO 12 INCHES ABOVE MARIAS PASS. WINDS GUSTING AS
HIGH AS 45 MPH.
* WHERE...BAD ROCK CANYON, GLACIER NATIONAL PARK, MARIAS PASS,
HIGHWAY 83 BIGFORK TO SWAN LAKE, POLEBRIDGE, AND ESSEX.
* WHEN...FROM 1 PM THURSDAY TO 11 AM MST SATURDAY.
* 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. GUSTY
WINDS COULD BRING DOWN TREE BRANCHES.
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.
IDZ006-MTZ006-201800-
/O.CON.KMSO.WW.Y.0049.251218T2000Z-251220T1800Z/
SOUTHERN CLEARWATER MOUNTAINS-BITTERROOT/SAPPHIRE MOUNTAINS-
710 PM MST WED DEC 17 2025 /610 PM PST WED DEC 17 2025/
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 1 PM MST /NOON
PST/ THURSDAY TO 11 AM MST /10 AM PST/ SATURDAY...
* WHAT...SNOW EXPECTED. THERE IS A LIKELIHOOD OF MINOR TO MODERATE
WINTER WEATHER IMPACTS. TOTAL SNOW ACCUMULATIONS BETWEEN 9 AND 15
INCHES IN HIGHER ELEVATIONS AND 5 TO 9 INCHES AT LOLO AND LOST
TRAIL PASSES. WINDS GUSTING AS HIGH AS 40 MPH.
* WHERE...HIGHWAY 12 LOWELL TO LOLO PASS, DIXIE, LOLO PASS, HIGHWAY
93 SULA TO LOST TRAIL PASS, AND ELK CITY.
* WHEN...FROM 1 PM MST /NOON PST/ THURSDAY TO 11 AM MST /10 AM PST/
SATURDAY.
* 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
EVENING AND FRIDAY MORNING 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.
MTZ004-201800-
/O.CON.KMSO.WW.Y.0049.251218T2000Z-251220T1800Z/
LOWER CLARK FORK REGION-
710 PM MST WED DEC 17 2025
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 1 PM THURSDAY TO
11 AM MST SATURDAY...
* WHAT...SNOW EXPECTED. THERE IS A LIKELIHOOD OF MINOR TO MODERATE
WINTER WEATHER IMPACTS. TOTAL SNOW ACCUMULATIONS 5 TO 9 INCHES AT
LOOKOUT PASS. WINDS GUSTING AS HIGH AS 35 MPH.
* WHERE...I-90 LOOKOUT PASS TO HAUGAN.
* WHEN...FROM 1 PM THURSDAY TO 11 AM MST SATURDAY.
* 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
EVENING AND FRIDAY MORNING 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.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page