863
WWUS45 KBYZ 112055
WSWBYZ
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE BILLINGS MT
155 PM MST THU DEC 11 2025
MTZ033-036-037-122100-
/O.CAN.KBYZ.WS.A.0018.251212T1200Z-251213T1800Z/
/O.EXT.KBYZ.WW.Y.0041.251212T0000Z-251213T1500Z/
FALLON-POWDER RIVER-CARTER-
INCLUDING THE LOCATIONS OF EKALAKA, BELLTOWER, HAMMOND, PLEVNA,
BIDDLE, BAKER, WEBSTER, SONNETTE, POWDERVILLE, BROADUS, AND ALZADA
155 PM MST THU DEC 11 2025
..WINTER STORM WATCH IS CANCELLED
...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 5 PM THIS AFTERNOON TO
8 AM MST SATURDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 3 TO 6 INCHES
* WHERE...CARTER, FALLON, AND POWDER RIVER.
* WHEN...FROM 5 PM THIS AFTERNOON TO 8 AM MST SATURDAY.
* IMPACTS...RAPIDLY FALLING TEMPERATURES COMBINED WITH RAIN CHANGING
TO SNOW MAY RESULT IN A FLASH FREEZE ON ROADWAYS THIS EVENING.
TRAVEL MAY BECOME TREACHEROUS DURING THIS TIME. TRAVEL CONDITIONS
WILL REMAIN DIFFICULT INTO SATURDAY DUE TO ACCUMULATING SNOW.
* ADDITIONAL DETAILS...A BREAK IN THE PRECIPITATION IS EXPECTED
TONIGHT. EXPECT SNOW TO BECOME WIDESPREAD AND HEAVIER FRIDAY INTO
SATURDAY MORNING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. FOR THE LATEST ROAD
CONDITIONS, CALL 5 1 1.
MTZ030>032-122100-
/O.UPG.KBYZ.WS.A.0018.251212T1200Z-251213T1800Z/
/O.EXB.KBYZ.WS.W.0019.251212T1200Z-251213T1500Z/
/O.CON.KBYZ.WW.Y.0041.251212T0000Z-251212T1200Z/
TREASURE-NORTHERN ROSEBUD-CUSTER-
INCLUDING THE LOCATIONS OF HYSHAM, INGOMAR, MILES CITY, FORSYTH,
COLSTRIP, ISMAY, VOLBORG, ANGELA, AND BIGHORN
155 PM MST THU DEC 11 2025
...WINTER STORM WARNING IN EFFECT FROM 5 AM FRIDAY TO 8 AM MST
SATURDAY...
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON
TO 5 AM MST FRIDAY...
* WHAT...FOR THE WINTER WEATHER ADVISORY, SNOW AND POOR TRAVEL
CONDITIONS EXPECTED. TOTAL SNOW ACCUMULATIONS UP TO ONE INCH. FOR
THE WINTER STORM WARNING, HEAVY SNOW EXPECTED. TOTAL SNOW
ACCUMULATIONS BETWEEN 5 AND 10 INCHES.
* WHERE...TREASURE, CUSTER, AND NORTHERN ROSEBUD.
* WHEN...FOR THE WINTER WEATHER ADVISORY, FROM 5 PM THIS AFTERNOON TO
5 AM MST FRIDAY. FOR THE WINTER STORM WARNING, FROM 5 AM FRIDAY TO
8 AM MST SATURDAY.
* IMPACTS...RAPIDLY FALLING TEMPERATURES COMBINED WITH RAIN CHANGING
TO SNOW MAY RESULT IN A FLASH FREEZE ON ROADWAYS THIS EVENING.
TRAVEL MAY BECOME TREACHEROUS DURING THIS TIME. TRAVEL CONDITIONS
WILL REMAIN DIFFICULT INTO SATURDAY DUE TO HEAVY ACCUMULATING SNOW.
* ADDITIONAL DETAILS...A BREAK IN THE PRECIPITATION IS EXPECTED
TONIGHT. EXPECT SNOW TO BECOME WIDESPREAD AND HEAVIER FRIDAY INTO
SATURDAY MORNING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU MUST TRAVEL, KEEP AN EXTRA FLASHLIGHT, FOOD, AND WATER IN YOUR
VEHICLE IN CASE OF AN EMERGENCY. FOR THE LATEST ROAD CONDITIONS, CALL
5 1 1.
MTZ029-042-063-173-228-122100-
/O.CON.KBYZ.WS.W.0019.251211T2100Z-251213T0600Z/
MUSSELSHELL-GOLDEN VALLEY-JUDITH GAP-NORTHEASTERN YELLOWSTONE-
SOUTHERN WHEATLAND-
INCLUDING THE LOCATIONS OF CUSTER, HARLOWTON, POMPEYS PILLAR,
SHAWMUT, MELSTONE, MUSSELSHELL, JUDITH GAP, TWODOT, ROUNDUP, RYEGATE,
AND LAVINA
155 PM MST THU DEC 11 2025
..WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM MST FRIDAY
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 6 AND
10 INCHES. WINDS GUSTING AS HIGH AS 45 MPH THROUGH JUDITH GAP THIS
EVENING INTO TONIGHT.
* WHERE...GOLDEN VALLEY, JUDITH GAP, MUSSELSHELL, SOUTHERN WHEATLAND,
AND NORTHEASTERN YELLOWSTONE.
* WHEN...UNTIL 11 PM MST FRIDAY.
* IMPACTS...TRAVEL WILL BE VERY DIFFICULT WITH SLICK AND SNOW COVERED
ROADS, AND AREAS OF POOR VISIBILITY. BLOWING AND DRIFTING SNOW WILL
IMPACT TRAVEL ON US-191 THROUGH JUDITH GAP THIS EVENING INTO
TONIGHT.
* ADDITIONAL DETAILS...RAPIDLY FALLING TEMPERATURES COMBINED WITH
RAIN CHANGING TO SNOW MAY RESULT IN A FLASH FREEZE ON ROADWAYS THIS
EVENING. TRAVEL MAY BECOME TREACHEROUS DURING THIS TIME.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU MUST TRAVEL, KEEP AN EXTRA FLASHLIGHT, FOOD, AND WATER IN YOUR
VEHICLE IN CASE OF AN EMERGENCY. FOR THE LATEST ROAD CONDITIONS, CALL
5 1 1.
MTZ068-122100-
/O.CON.KBYZ.WS.W.0019.251211T2100Z-251213T0300Z/
CRAZY MOUNTAINS-
155 PM MST THU DEC 11 2025
..WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY
* WHAT...PERIODS OF MODERATE TO HEAVY SNOW EXPECTED. TOTAL SNOW
ACCUMULATIONS BETWEEN 10 AND 18 INCHES ON WEST ASPECTS.
* WHERE...CRAZY MOUNTAINS.
* WHEN...UNTIL 8 PM MST FRIDAY.
* IMPACTS...RECREATION IN THE HIGH COUNTRY WILL BE IMPACTED BY HEAVY
ACCUMULATING SNOW AND BLOWING SNOW.
* ADDITIONAL DETAILS...AVALANCHE DANGER MAY INCREASE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE PREPARED FOR WINTRY CONDITIONS IF YOU HAVE PLANS IN THE
BACKCOUNTRY.
MTZ034-057-058-138-141-172-235-122100-
/O.CON.KBYZ.WS.W.0019.251212T0000Z-251213T0300Z/
NORTHERN STILLWATER-NORTHERN BIG HORN-SOUTHERN ROSEBUD-SOUTHERN
BIG HORN-NORTHERN SWEET GRASS-MELVILLE FOOTHILLS-SOUTHWESTERN
YELLOWSTONE-
INCLUDING THE LOCATIONS OF HARDIN, ABSAROKEE, LODGE GRASS, PARK CITY,
BUSBY, HUNTLEY, BIG TIMBER, CROW AGENCY, MELVILLE, PRYOR, BROADVIEW,
BIRNEY, COLUMBUS, LAME DEER, ASHLAND, REED POINT, LAUREL, WYOLA,
BILLINGS, AND RAPELJE
155 PM MST THU DEC 11 2025
...WINTER STORM WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO
8 PM MST FRIDAY...
* WHAT...HEAVY SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 4 AND
9 INCHES.
* WHERE...PORTIONS OF SOUTH CENTRAL AND SOUTHEAST MONTANA.
* WHEN...FROM 5 PM THIS AFTERNOON TO 8 PM MST FRIDAY.
* IMPACTS...TRAVEL WILL BE VERY DIFFICULT WITH SLICK AND SNOW COVERED
ROADS, AND AREAS OF POOR VISIBILITY.
* ADDITIONAL DETAILS...RAPIDLY FALLING TEMPERATURES COMBINED WITH
RAIN CHANGING TO SNOW MAY RESULT IN A FLASH FREEZE ON ROADWAYS THIS
EVENING. TRAVEL MAY BECOME TREACHEROUS DURING THIS TIME.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU MUST TRAVEL, KEEP AN EXTRA FLASHLIGHT, FOOD, AND WATER IN YOUR
VEHICLE IN CASE OF AN EMERGENCY. FOR THE LATEST ROAD CONDITIONS, CALL
5 1 1.
MTZ040-056-065-066-139-121600-
/O.EXB.KBYZ.WW.Y.0041.251212T0100Z-251212T1600Z/
NORTHERN PARK-RED LODGE FOOTHILLS-LIVINGSTON AREA-BEARTOOTH
FOOTHILLS-SOUTHEASTERN CARBON-
INCLUDING THE LOCATIONS OF ROBERTS, SPRINGDALE, LIVINGSTON, WARREN,
FISHTAIL, BRIDGER, ROSCOE, RED LODGE, BELFRY, CLYDE PARK, WILSALL,
NYE, AND MCLEOD
155 PM MST THU DEC 11 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 9 AM
MST FRIDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 1 TO 3 INCHES.
* WHERE...BEARTOOTH FOOTHILLS, LIVINGSTON AREA, NORTHERN PARK, RED
LODGE FOOTHILLS, AND SOUTHEASTERN CARBON.
* WHEN...FROM 6 PM THIS EVENING TO 9 AM MST FRIDAY.
* IMPACTS...TRAVEL WILL BE DIFFICULT WITH SLICK AND SNOW COVERED
ROADS, AND AREAS OF POOR VISIBILITY.
* ADDITIONAL DETAILS...RAPIDLY FALLING TEMPERATURES COMBINED WITH
RAIN CHANGING TO SNOW MAY RESULT IN A FLASH FREEZE ON ROADWAYS THIS
EVENING. TRAVEL MAY BECOME TREACHEROUS DURING THIS TIME.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. FOR THE LATEST ROAD
CONDITIONS, CALL 5 1 1.
MTZ171-WYZ198-121900-
/O.EXA.KBYZ.WW.Y.0041.251212T0100Z-251212T1900Z/
PRYOR/NORTHERN BIGHORN MOUNTAINS-NORTHEAST BIGHORN MOUNTAINS-
INCLUDING THE LOCATIONS OF BURGESS JCT AND STORY
155 PM MST THU DEC 11 2025
...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO NOON
MST FRIDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 4 AND 8
INCHES. WINDS GUSTING AS HIGH AS 30 MPH.
* WHERE...IN MONTANA, PRYOR/NORTHERN BIGHORN MOUNTAINS. IN WYOMING,
NORTHEAST BIGHORN MOUNTAINS.
* WHEN...FROM 6 PM THIS EVENING TO NOON MST FRIDAY.
* IMPACTS...PLAN ON SLIPPERY ROAD CONDITIONS, ESPECIALLY ALONG
HIGHWAY 14 THROUGH THE BIGHORN MOUNTAINS. FALLING AND BLOWING SNOW
WILL IMPACT RECREATION.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE PREPARED FOR WINTRY CONDITIONS IF YOU HAVE PLANS IN THE
BACKCOUNTRY.
MTZ169-170-WYZ199-121900-
/O.CON.KBYZ.WW.Y.0041.251212T0100Z-251212T1900Z/
BIGHORN CANYON-NORTHERN CARBON-SHERIDAN FOOTHILLS-
INCLUDING THE LOCATIONS OF FORT SMITH, CLEARMONT, DAYTON, SHERIDAN,
JOLIET, BIG HORN, RANCHESTER, AND FROMBERG
155 PM MST THU DEC 11 2025
...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO NOON MST FRIDAY...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS BETWEEN 2 AND 5
INCHES.
* WHERE...IN MONTANA, BIGHORN CANYON AND NORTHERN CARBON. IN WYOMING,
SHERIDAN FOOTHILLS.
* WHEN...FROM 6 PM THIS EVENING TO NOON MST FRIDAY.
* IMPACTS...PLAN ON DIFFICULT TRAVEL CONDITIONS AS ROADS BECOME SNOW
COVERED AND SLICK.
* ADDITIONAL DETAILS...TRAVEL COULD BE DIFFICULT THIS EVENING AS
RAPIDLY FALLING TEMPERATURES COMBINED WITH RAIN CHANGING TO SNOW
MAY RESULT IN A FLASH FREEZE ON SOME ROADS. THIS INCLUDES
INTERSTATE 90 THROUGH SHERIDAN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. FOR THE LATEST ROAD
CONDITIONS, CALL 5 1 1.
ADDITIONAL GRAPHICS FOR THIS HAZARD CAN BE FOUND AT
HTTP://WWW.WEATHER.GOV/BILLINGS
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