Winter Storm Warning 18, NWS Billings, MT

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HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
320 PM MST TUE DEC 20 2011

MTZ028>042-056>058-063>068-WYZ098-099-212230-
SOUTHERN WHEATLAND-MUSSELSHELL-TREASURE-NORTHERN ROSEBUD-CUSTER-
FALLON-NORTHERN STILLWATER-YELLOWSTONE-POWDER RIVER-CARTER-
SOUTHERN BIG HORN-EASTERN CARBON-NORTHERN PARK-
NORTHERN SWEET GRASS-GOLDEN VALLEY-RED LODGE FOOTHILLS-
NORTHERN BIG HORN-SOUTHERN ROSEBUD-JUDITH GAP-PARADISE VALLEY-
LIVINGSTON AREA-BEARTOOTH FOOTHILLS-ABSAROKA/BEARTOOTH MOUNTAINS-
CRAZY MOUNTAINS-NORTHEAST BIG HORN MOUNTAINS-SHERIDAN FOOTHILLS-
320 PM MST TUE DEC 20 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
MONTANA...SOUTH CENTRAL MONTANA...SOUTHEAST MONTANA AND NORTH
CENTRAL WYOMING.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A WINTER STORM SYSTEM IS EXPECTED TO IMPACT AREAS WEST OF A
ROUNDUP TO BROADUS LINE WITH SIGNIFICANT SNOWFALL TONIGHT THROUGH
WEDNESDAY. THE BEARTOOTH/ABSAROKA AND BIG HORN MOUNTAIN RANGES AND
THEIR ASSOCIATED FOOTHILL REGIONS WILL SEE THE BEST POTENTIAL FOR
HEAVY SNOWFALL DURING THIS PERIOD. WIDESPREAD SNOW ACCUMULATIONS
AROUND 3 INCHES SEEM REASONABLE WITH HEAVIER SNOWFALL POSSIBLE.
THIS SYSTEM IS EXPECTED TO CAUSE TRAVEL DIFFICULTIES. EAST OF THE
ROUNDUP TO BROADUS LINE SNOW ACCUMULATIONS ARE EXPECTED TO BE
LIGHTER...HOWEVER ROADS WILL LIKELY BE SNOW COVERED AND SLICK IN
THESE AREAS IMPACTING TRAVEL.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SOUTHWEST WINDS WILL DEVELOP LATE THURSDAY NIGHT IN THE WESTERN
FOOTHILLS FROM LIVINGSTON TO NYE...AND NORTH FROM BIG TIMBER TO
HARLOWTON. THESE WINDS WILL BECOME STRONG ON FRIDAY WITH POSSIBLE
SOUTHWEST WINDS GUSTING 45 TO 55 MPH. THE STRONG WIND GUSTS
COMBINED WITH SNOW COVER MAY RESULT IN SIGNIFICANT BLOWING AND
DRIFTING SNOW WHICH COULD CREATE VERY POOR VISIBILITIES AND
DRIFTING OVER ROADWAYS. BLOWING SNOW AND STRONG CROSSWINDS ARE
POSSIBLE ON PORTIONS OF I-90 FROM LIVINGSTON TO BIG TIMBER AS WELL
AS PORTIONS OF HIGHWAY 191 FROM BIG TIMBER TO HARLOWTON AMONG
OTHER ROADWAYS IN THE AREA.

HOLIDAY TRAVEL THIS WEEK HAS THE POTENTIAL TO BE SIGNIFICANTLY
IMPACTED...MAINLY WEST OF A ROUNDUP TO BROADUS LINE. TRAVELERS
SHOULD MONITOR THE LATEST FORECAST FOR DETAILS AND CHANGES ALONG
THEIR PATH OF TRAVEL AND PLAN FOR POTENTIAL WINTER CONDITIONS.
TRAVELERS SHOULD ALSO MAKE SURE TO HAVE A WINTER SURVIVAL KIT IN
THEIR VEHICLES IN CASE OF AN EMERGENCY.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.