Wind Chill Warning 3, NWS Missoula, MT

000 
WWUS45 KMSO 192123
WSWMSO

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
223 PM MST FRI DEC 19 2008


MTZ002-200600-
/O.CAN.KMSO.WC.W.0003.000000T0000Z-081220T1200Z/
/O.EXB.KMSO.WC.Y.0004.000000T0000Z-081220T0600Z/
WEST GLACIER REGION-
223 PM MST FRI DEC 19 2008

...WIND CHILL ADVISORY IN EFFECT UNTIL 11 PM MST THIS EVENING...
...WIND CHILL WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WIND CHILL
ADVISORY...WHICH IS IN EFFECT UNTIL 11 PM MST THIS EVENING. THE
WIND CHILL WARNING HAS BEEN CANCELLED. 

THE COMBINATION OF NORTHERLY WINDS 15 TO 25 MPH AND COLD AIR
SPILLING INTO THE VALLEYS WILL CREATE WIND CHILL VALUES BETWEEN
10 BELOW AND 20 BELOW ZERO THIS EVENING. LOCAL WIND CHILLS MAY
DIP AS LOW AS 25 BELOW ZERO IN AREAS WHERE WINDS ARE CHANNELED.

SNOW SHOWERS CAN STILL BE EXPECTED THROUGH TONIGHT. SNOWFALL WILL
BE MORE LOCALIZED WITH ADDITIONAL ACCUMULATIONS GENERALLY LESS
THAN AN INCH.

A WIND CHILL ADVISORY MEANS THAT VERY COLD AIR AND STRONG WINDS
WILL COMBINE TO GENERATE LOW WIND CHILLS. THIS WILL RESULT IN
FROST BITE AND LEAD TO HYPOTHERMIA IF PRECAUTIONS ARE NOT TAKEN.
IF YOU MUST VENTURE OUTDOORS...MAKE SURE YOU WEAR A HAT AND
GLOVES.


$$

MTZ007-043-192230-
/O.CAN.KMSO.WC.W.0003.000000T0000Z-081220T1200Z/
BUTTE/BLACKFOOT REGION-POTOMAC/SEELEY LAKE REGION-
223 PM MST FRI DEC 19 2008

...WIND CHILL WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS CANCELLED THE WIND
CHILL WARNING. 


$$

MTZ003-200600-
/O.EXT.KMSO.WC.Y.0004.000000T0000Z-081220T0600Z/
FLATHEAD/MISSION VALLEYS-
223 PM MST FRI DEC 19 2008

...WIND CHILL ADVISORY NOW IN EFFECT UNTIL 11 PM MST THIS
EVENING...

THE WIND CHILL ADVISORY IS NOW IN EFFECT UNTIL 11 PM MST THIS
EVENING. 

THE COMBINATION OF NORTHERLY WINDS 15 TO 25 MPH AND COLD AIR
SPILLING INTO THE VALLEYS WILL CREATE WIND CHILL VALUES BETWEEN
10 BELOW AND 20 BELOW ZERO THIS EVENING. LOCAL WIND CHILLS MAY
DIP AS LOW AS 25 BELOW ZERO IN AREAS WHERE WINDS ARE
CHANNELED...LIKE COLUMBIA FALLS SOUTH TO KALISPELL.

SNOW SHOWERS CAN STILL BE EXPECTED THROUGH TONIGHT. SNOWFALL WILL
BE MORE LOCALIZED WITH ADDITIONAL ACCUMULATIONS GENERALLY LESS
THAN AN INCH.

A WIND CHILL ADVISORY MEANS THAT VERY COLD AIR AND STRONG WINDS
WILL COMBINE TO GENERATE LOW WIND CHILLS. THIS WILL RESULT IN
FROST BITE AND LEAD TO HYPOTHERMIA IF PRECAUTIONS ARE NOT TAKEN.
IF YOU MUST VENTURE OUTDOORS...MAKE SURE YOU WEAR A HAT AND
GLOVES.

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
815 PM MST THU DEC 18 2008

.UPDATE...INCREASED LOW TEMPERATURES TONIGHT AND HIGH TEMPERATURES
TOMORROW. REDUCED THE AMOUNT OF SNOWFALL EXPECTED IN THE MISSOULA VALLEY
FOR THIS EVENING.

&&

.DISCUSSION...THE COLD ARCTIC AIR IS CONTINUING TO PROGRESS
THROUGH THE FLATHEAD VALLEY THIS EVENING...HOWEVER IT IS NOT
LIKELY TO MAKE IT FAR ENOUGH SOUTH TO AFFECT AREAS SOUTH OF A LINE
FROM MISSOULA TO BUTTE. FRIDAY COLD AIR WILL FILTER SOUTH OF THIS
LINE KEEPING TEMPERATURES FROM RISING MUCH AT ALL LEAVING THE
WARMEST TEMPERATURES LIKELY IN THE MORNING.

A BAND OF MODERATE TO HEAVY SNOWFALL CONTINUES OVER NORTHWEST MONTANA
WITH THE SOUTHERN EDGE OF THIS BAND ENTERING CENTRAL IDAHO. THIS
BAND WILL PROGRESS EAST THROUGH THE NIGHT.

&&

AVIATION...A BAND OF MODERATE TO HEAVY SNOW IS MOVING THROUGH NORTHWEST
MONTANA CAUSING REDUCED VISIBILITIES AND LOW CEILINGS. KGPI WILL
CONTINUE TO BE IMPACTED...WITH GUSTY WINDS TO CONTINUE THROUGH
FRIDAY MORNING...CAUSING BLOWING SNOW WITH VISIBILITIES DROPPING
TO LIFR FOR PERIODS OF TIME THROUGHOUT THE NIGHT. THIS BAND OF
SNOW WILL SLOWLY MOVE SOUTHWARD OVERNIGHT...AFFECTING KMSO AND
KBTM THROUGH FRIDAY MORNING. IN ADDITION TO THE MODERATE TO HEAVY
SNOW...AN ARCTIC AIRMASS IS MAKING ITS WAY INTO WESTERN MONTANA.
THE INFILTRATION OF COLDER AIR WILL CREATE AREAS OF BLOWING SNOW
AT KMSO AND KBTM...THOUGH THESE TERMINALS SHOULD NOT BE AFFECTED
BY THIS UNTIL EARLY FRIDAY MORNING.

&&

.PREV DISCUSSION... /ISSUED 247 PM MST THU DEC 18 2008/

DISCUSSION...

..MOISTURE IMPACT...

A BAND OF MODERATE TO HEAVY SNOW HAS DEVELOPED OVER NORTHWEST
MONTANA TODAY. THIS BAND IS EXPECTED TO SLOWLY TRACK SOUTHWARD
THROUGHOUT THE NIGHT AS A LOW PRESSURE SYSTEM DIGS OVER THE PACIFIC
NORTHWEST. SINCE THE BAND IS NOT MOVING NEARLY AS FAST AS
PREVIOUSLY FORECAST HAVE EXTEND THE WARNINGS FOR THE NORTHERN
ROCKIES. FOR MORE INFORMATION PLEASE REFER TO
WWW.WEATHER.GOV/MISSOULA. MOST LOCATIONS ACROSS WESTERN MONTANA AND
NORTH CENTRAL IDAHO SHOULD SEE SEVERAL INCHES OF NEW SNOW BY FRIDAY
MORNING.

THE UPPER LEVEL FLOW APPEARS TO TRANSITION FROM THE NORTHWEST
ALLOWING SOME MOISTURE AND INSTABILITY TO REMAIN...KEEPING ISOLATED
TO SCATTERED SNOW SHOWERS OVER THE NORTHERN ROCKIES THROUGH FRIDAY
NIGHT. THE DRIEST PERIOD IN THE SHORT TERM APPEARS TO BE ON
SATURDAY.

THE MODELS ARE INDICATING ANOTHER LOW PRESSURE SYSTEM SWINGING
THROUGH THE NORTHERN ROCKIES SUNDAY THROUGH MONDAY. ONCE AGAIN THE
REGION COULD SEE WIDESPREAD SNOW WITH MANY LOCATIONS REACHING
HIGHLIGHT CRITERIA. KEEP CHECKING INTO WWW.WEATHER.GOV/MISSOULA
FOR FURTHER UPDATES ON THIS SYSTEM.

ANOTHER REPRIEVE FROM THE PRECIPITATION IS EXPECTED MID NEXT WEEK.
THE MODELS ARE STILL SHOWING A THIRD EVENT OCCURRING ON CHRISTMAS EVE
INTO CHRISTMAS. THE TIMING AND IMPACT OF THIS SYSTEM IS STILL
UNCERTAIN AT THIS TIME.

..TEMPERATURE AND WIND IMPACT...SOME WHAT MILDER TEMPERATURES
TONIGHT ACROSS WESTERN MONTANA AND NORTH CENTRAL IDAHO TONIGHT.
THE COLDEST TEMPERATURES WILL BE ACROSS NORTHWEST MONTANA. ANOTHER
SURGE OF COLD ARCTIC AIR WILL PUSH ACROSS THE DIVIDE ON FRIDAY AND
SETTLE INTO THE REGION OVER THE WEEKEND. TEMPERATURES WILL
MODERATE SOME ON SUNDAY...BUT EXPECT A VERY SLOW WARM UP IN THE
VALLEYS AS INVERSIONS WILL BE STRONG AND HARD TO BREAK. THIS VERY
SLOW MODERATION OF THE AIR MASS WILL CONTINUE THROUGH THE COMING
WEEK.

WINDS WILL INCREASE FRIDAY MORNING AND CONTINUE STRONG AND GUSTY
INTO SATURDAY MORNING ACROSS MUCH OF WESTERN MONTANA. THE
COMBINATION OF THE COLD TEMPERATURES AND GUSTY WINDS WILL PRODUCE
VERY COLD WIND CHILL TEMPERATURES IN THIS REGION THROUGH SATURDAY
MORNING...ESPECIALLY THROUGH THE PASSES OF THE CONTINENTAL DIVIDE.
WINDS WILL DROP OFF SATURDAY AFTERNOON. SOUTHERLY WINDS WILL BE ON
THE INCREASE ON SUNDAY ACROSS NORTH CENTRAL IDAHO AHEAD OF THE
NEXT IN COMING SYSTEM.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...WINTER WEATHER ADVISORY UNTIL 11 AM MST FRIDAY FOR
     MISSOULA/BITTERROOT VALLEYS.

     WINTER STORM WARNING UNTIL 5 AM MST FRIDAY FOR KOOTENAI/CABINET
     REGION-LOWER CLARK FORK REGION.

     WINTER STORM WARNING UNTIL 5 AM MST FRIDAY FOR FLATHEAD/MISSION
     VALLEYS-WEST GLACIER REGION.

     WINTER STORM WARNING UNTIL 11 AM MST FRIDAY FOR
     BITTERROOT/SAPPHIRE MOUNTAINS.

     WINTER STORM WARNING UNTIL 5 AM MST SATURDAY FOR POTOMAC/SEELEY
     LAKE REGION.

     WINTER STORM WARNING UNTIL 5 AM MST SATURDAY FOR BUTTE/BLACKFOOT
     REGION.

ID...WINTER WEATHER ADVISORY UNTIL 4 AM PST FRIDAY FOR
     OROFINO/GRANGEVILLE REGION.

     WINTER STORM WARNING UNTIL 4 AM PST FRIDAY FOR NORTHERN
     CLEARWATER MOUNTAINS.

     WINTER STORM WARNING UNTIL 10 AM PST FRIDAY FOR SOUTHERN
     CLEARWATER MOUNTAINS.

&&

UPDATE...LOEFFELBEIN/ALLEGRETTO
PREVIOUS DISCUSSION....WHITMORE/KOLATA/SMITH
AVIATION...ALLEGRETTO

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MISSOULA MT
844 PM MST THU DEC 18 2008

IDZ005>007-MTZ001>007-043-191545-
NORTHERN CLEARWATER MOUNTAINS-SOUTHERN CLEARWATER MOUNTAINS-
OROFINO/GRANGEVILLE REGION-KOOTENAI/CABINET REGION-
WEST GLACIER REGION-FLATHEAD/MISSION VALLEYS-
LOWER CLARK FORK REGION-MISSOULA/BITTERROOT VALLEYS-
BITTERROOT/SAPPHIRE MOUNTAINS-BUTTE/BLACKFOOT REGION-
POTOMAC/SEELEY LAKE REGION-
844 PM MST THU DEC 18 2008 /744 PM PST THU DEC 18 2008/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
IDAHO...NORTHWEST MONTANA AND WEST CENTRAL MONTANA.

FOR THE LATEST INFORMATION ON WATCHES...WARNINGS AND ADVISORIES...GO
TO WEATHER.GOV/MISSOULA.

.DAY ONE...TONIGHT

MODERATE TO LOCALLY HEAVY SNOW WILL MOVE FROM NORTHWEST MONTANA THIS
AFTERNOON...TO NORTH CENTRAL IDAHO AND WEST CENTRAL MONTANA OVERNIGHT.
WHILE SNOWFALL WILL DECREASE IN INTENSITY OVER NORTHWEST MONTANA...COLD
AIR COMBINED WITH GUSTY NORTHEAST WINDS WILL CAUSE AREAS OF
BLOWING AND DRIFTING SNOW AND DANGEROUS WIND CHILLS.

INCREASING SNOW ACCUMULATIONS OVER NORTH CENTRAL IDAHO AND WEST
CENTRAL MONTANA WILL MAKE TRAVEL HAZARDOUS OVERNIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A VERY COLD AND UNSTABLE AIRMASS WILL SETTLE OVER THE NORTHERN ROCKIES
FRIDAY AND SATURDAY. MODERATE SNOW ACCUMULATIONS MAY BE SEEN OVER SOUTHWEST
MONTANA FRIDAY MORNING. OTHERWISE...SNOW SHOWERS WILL IN GENERAL BE LIGHT
TO MODERATE FRIDAY INTO EARLY SATURDAY. NORTHWEST MONTANA AND
ALONG THE CONTINENTAL DIVIDE WILL EXPERIENCE DANGEROUS WIND CHILLS
TEMPERATURES.

AS SKIES BEGIN TO CLEAR BY SATURDAY NIGHT...VERY COLD TEMPERATURES
WELL BELOW ZERO WILL BE SEEN ESPECIALLY IN WESTERN MONTANA.

A MOIST PACIFIC SYSTEM WILL APPROACH THE AREA SUNDAY. MODERATE TO LOCALLY
HEAVY SNOW IS POSSIBLE OVER NORTH CENTRAL IDAHO BY SUNDAY AFTERNOON
AND EVENING...WHILE WESTERN MONTANA MAY EXPERIENCE DANGEROUS WIND CHILL
TEMPERATURES FROM LOCAL GUSTY SOUTHEAST WINDS. WIDESPREAD SNOW IS
EXPECTED SUNDAY NIGHT INTO MONDAY. THE POTENTIAL EXISTS FOR MODERATE
TO HEAVY SNOW TO BE FOCUSED OVER NORTH CENTRAL AND SOUTHEAST
IDAHO...AS WELL AS WEST CENTRAL AND SOUTHWEST MONTANA.

A UNSETTLED WEATHER PATTERN IS EXPECTED THROUGH NEXT WEEK...WITH MORE
SNOW ACCUMULATIONS EXPECTED. TEMPERATURES ARE EXPECTED TO SLOWLY MODERATE
THROUGH THE WEEK BUT REMAIN BELOW NORMAL ESPECIALLY OVER NORTHWEST MONTANA.
THE CONTINUATION OF COLD TEMPERATURES WILL RESULT IN FREEZING OF
AREA RIVERS AND STREAMS...RESULTING IN AN INCREASED THREAT OF ICE
JAMS. FLOODING IS POSSIBLE WHEN ICE JAMS BREAK OR SPREAD OUT OF
RIVER BANKS. COUNTY OFFICIALS HAVE REPORTED WARM SPRINGS CREEK IN
DEER LODGE COUNTY IS APPROACHING FLOOD STAGE AND IS ONE LOCATION
IN DANGER OF FLOODING.

.SPOTTER INFORMATION STATEMENT...

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

IDZ008>010-191545-
LOWER HELLS CANYON/SALMON RIVER REGION-WESTERN LEMHI COUNTY-
EASTERN LEMHI COUNTY-
844 PM MST THU DEC 18 2008 /744 PM PST THU DEC 18 2008/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
IDAHO.

.DAY ONE...TONIGHT

MODERATE TO LOCALLY HEAVY SNOW WILL MOVE FROM NORTHWEST MONTANA THIS
AFTERNOON...TO NORTH CENTRAL IDAHO AND WEST CENTRAL MONTANA OVERNIGHT.
SNOW ACCUMULATIONS WILL MAKE TRAVEL HAZARDOUS TONIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

A VERY COLD AND UNSTABLE AIRMASS WILL SETTLE OVER THE NORTHERN ROCKIES
FRIDAY AND SATURDAY. MODERATE SNOW ACCUMULATIONS MAY BE SEEN OVER SOUTHWEST
MONTANA AND LOST TRAIL PASS FRIDAY MORNING. OTHERWISE...SNOW
SHOWERS WILL IN GENERAL BE LIGHT TO MODERATE FRIDAY INTO EARLY
SATURDAY. ALONG THE CONTINENTAL DIVIDE...COLDER TEMPERATURES ALONG
WITH LOCAL GUSTY NORTHEAST WINDS WILL CREATE DANGEROUS WIND
CHILLS TEMPERATURES FRIDAY NIGHT.

AS SKIES BEGIN TO CLEAR BY SATURDAY NIGHT...VERY COLD TEMPERATURES
WELL BELOW ZERO WILL BE SEEN...ESPECIALLY OVER SOUTHWEST MONTANA AND
ALONG THE CONTINENTAL DIVIDE.

A MOIST PACIFIC SYSTEM WILL APPROACH THE AREA SUNDAY. MODERATE TO LOCALLY
HEAVY SNOW IS POSSIBLE OVER NORTH CENTRAL IDAHO BY SUNDAY AFTERNOON
AND EVENING...WHILE WESTERN MONTANA MAY EXPERIENCE DANGEROUS WIND CHILL
TEMPERATURES FROM LOCAL GUSTY SOUTHEAST WINDS. WIDESPREAD SNOW IS
EXPECTED SUNDAY NIGHT INTO MONDAY. THE POTENTIAL EXISTS FOR MODERATE
TO HEAVY SNOW TO BE FOCUSED OVER NORTH CENTRAL AND SOUTHEAST
IDAHO...AS WELL AS WEST CENTRAL AND SOUTHWEST MONTANA.

A UNSETTLED WEATHER PATTERN IS EXPECTED THROUGH NEXT WEEK...WITH MORE
SNOW ACCUMULATIONS EXPECTED. TEMPERATURES ARE EXPECTED TO SLOWLY MODERATE
THROUGH THE WEEK. HOWEVER...THE CONTINUATION OF BELOW NORMAL TEMPERATURES
WILL RESULT IN THE CONTINUATION OF FREEZING OF AREA RIVERS AND
STREAMS...RESULTING IN AN INCREASED THREAT OF ICE JAMS. FLOODING
IS POSSIBLE WHEN ICE JAMS BREAK OR SPREAD OUT OF RIVER BANKS.

.SPOTTER INFORMATION STATEMENT...

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