Wind Advisory 20, NWS Missoula, MT

489 
WWUS75 KMSO 100547
NPWMSO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
1047 PM MST THU DEC 9 2010

MTZ007-101400-
/O.CON.KMSO.WI.Y.0020.101210T0600Z-101210T1500Z/
BUTTE/BLACKFOOT REGION-
1047 PM MST THU DEC 9 2010

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST FRIDAY...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST FRIDAY. 

* IMPACTS/TIMING: STRONG WINDS ALOFT ASSOCIATED WITH A POWERFUL 
  PACIFIC WEATHER SYSTEM MOVING THROUGH WEST-CENTRAL MONTANA 
  WILL DESCEND THE SLOPES OF THE FLINT CREEK/ANACONDA MOUNTAIN 
  RANGES AND IMPACT THE VALLEY LOCATIONS BETWEEN ANACONDA AND 
  GARRISON. WINDS OVER MACDONALD PASS WILL ALSO BE QUITE STRONG. 
  WINDS WILL BE INCREASING LATE TONIGHT...PEAKING EARLY FRIDAY 
  MORNING. 

* WINDS: INCREASING SOUTHWEST 15 TO 30 MPH AFTER MIDNIGHT 
  TONIGHT BECOMING ...WEST 20 TO 30 MPH WITH GUSTS UP TO 50 MPH 
  FRIDAY MORNING. 

* LOCATIONS IMPACTED INCLUDE...HIGHWAY 12 GARRISON TO ELLISTON...
   MACDONALD PASS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 35 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$

IDZ007-101400-
/O.CON.KMSO.WI.Y.0020.000000T0000Z-101210T1500Z/
OROFINO/GRANGEVILLE REGION-
947 PM PST THU DEC 9 2010

...WIND ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST FRIDAY FOR
GRANGEVILLE AND VICINITY...

A WIND ADVISORY FOR GRANGEVILLE AND VICINITY REMAINS IN EFFECT
UNTIL 7 AM PST FRIDAY. 

* IMPACTS/TIMING: STRONG WINDS ALOFT ASSOCIATED WITH A POWERFUL 
  PACIFIC WEATHER SYSTEM MOVING THROUGH NORTH-CENTRAL IDAHO WILL 
  DESCEND THE MOUNTAIN SLOPES SOUTH OF GRANGEVILLE AND IMPACT 
  GRANGEVILLE AND THE CAMAS PRAIRIE. WINDS WILL BE INCREASING 
  LATE TONIGHT...PEAKING EARLY FRIDAY MORNING. 

* WINDS: SOUTH 15 TO 30 MPH...INCREASING 25 TO 35 MPH WITH GUSTS 
  UP TO 55 MPH FRIDAY MORNING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 35 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$

MTZ005-101400-
/O.CON.KMSO.WI.Y.0020.000000T0000Z-101210T1500Z/
MISSOULA/BITTERROOT VALLEYS-
1047 PM MST THU DEC 9 2010

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST FRIDAY FOR THE
BITTERROOT VALLEY...

A WIND ADVISORY FOR THE BITTERROOT VALLEY REMAINS IN EFFECT UNTIL
8 AM MST FRIDAY. 

* IMPACTS/TIMING: STRONG WINDS ALOFT ASSOCIATED WITH A POWERFUL 
  PACIFIC WEATHER SYSTEM MOVING THROUGH WEST-CENTRAL MONTANA 
  WILL DESCEND THE SLOPES OF THE BITTERROOT MOUNTAINS AND IMPACT 
  THE BITTERROOT VALLEY. WINDS WILL BE INCREASING LATE TONIGHT...
   PEAKING EARLY FRIDAY MORNING. 

* WINDS: INCREASING SOUTHWEST 15 TO 30 MPH LATE TONIGHT... 
  BECOMING WEST 20 TO 30 MPH WITH GUSTS UP TO 50 MPH EARLY 
  FRIDAY MORNING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 35 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$

986 
WWUS75 KMSO 101153
NPWMSO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
453 AM MST FRI DEC 10 2010

MTZ007-101500-
/O.CON.KMSO.WI.Y.0020.000000T0000Z-101210T1500Z/
BUTTE/BLACKFOOT REGION-
453 AM MST FRI DEC 10 2010

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THIS MORNING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THIS MORNING. 

* IMPACTS/TIMING: STRONG WINDS ALOFT ASSOCIATED WITH A POWERFUL
  PACIFIC WEATHER SYSTEM MOVING THROUGH WEST-CENTRAL MONTANA WILL
  DESCEND THE SLOPES OF THE FLINT CREEK/ANACONDA MOUNTAIN RANGES
  AND IMPACT THE VALLEY LOCATIONS BETWEEN ANACONDA AND GARRISON.
  WINDS OVER MACDONALD PASS WILL ALSO BE QUITE STRONG. WINDS WILL
  BE INCREASING...PEAKING EARLY THIS MORNING.

* WINDS: WEST...20 TO 30 MPH WITH GUSTS UP TO 50 MPH THIS
  MORNING.

* LOCATIONS IMPACTED INCLUDE...HIGHWAY 12 GARRISON TO ELLISTON...
   MACDONALD PASS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 35 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$

IDZ007-101500-
/O.CON.KMSO.WI.Y.0020.000000T0000Z-101210T1500Z/
OROFINO/GRANGEVILLE REGION-
353 AM PST FRI DEC 10 2010

...WIND ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST THIS MORNING
FOR GRANGEVILLE AND VICINITY...

A WIND ADVISORY FOR GRANGEVILLE AND VICINITY REMAINS IN EFFECT
UNTIL 7 AM PST THIS MORNING. 

* IMPACTS/TIMING: STRONG WINDS ALOFT ASSOCIATED WITH A POWERFUL
  PACIFIC WEATHER SYSTEM MOVING THROUGH NORTH-CENTRAL IDAHO WILL
  DESCEND THE MOUNTAIN SLOPES SOUTH OF GRANGEVILLE AND IMPACT
  GRANGEVILLE AND THE CAMAS PRAIRIE. WINDS WILL BE PEAKING EARLY
  THIS MORNING.

* WINDS: SOUTH 15 TO 30 MPH...INCREASING 25 TO 35 MPH WITH GUSTS 
  UP TO 55 MPH THIS MORNING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 35 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$

MTZ005-101500-
/O.CON.KMSO.WI.Y.0020.000000T0000Z-101210T1500Z/
MISSOULA/BITTERROOT VALLEYS-
453 AM MST FRI DEC 10 2010

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THIS MORNING
FOR THE BITTERROOT VALLEY...

A WIND ADVISORY FOR THE BITTERROOT VALLEY REMAINS IN EFFECT UNTIL
8 AM MST THIS MORNING. 

* IMPACTS/TIMING: STRONG WINDS ALOFT ASSOCIATED WITH A POWERFUL
  PACIFIC WEATHER SYSTEM MOVING THROUGH WEST-CENTRAL MONTANA WILL
  DESCEND THE SLOPES OF THE BITTERROOT MOUNTAINS AND IMPACT THE
  BITTERROOT VALLEY. WINDS WILL BE INCREASING...PEAKING EARLY
  THIS MORNING.

* WINDS: SOUTHWEST 15 TO 30 MPH...BECOMING WEST 20 TO 30 MPH WITH
  GUSTS UP TO 50 MPH EARLY THIS MORNING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 35 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$

411 
WWUS75 KMSO 101447
NPWMSO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
747 AM MST FRI DEC 10 2010


IDZ007-MTZ005-007-101600-
/O.CAN.KMSO.WI.Y.0020.000000T0000Z-101210T1500Z/
OROFINO/GRANGEVILLE REGION-MISSOULA/BITTERROOT VALLEYS-
BUTTE/BLACKFOOT REGION-
747 AM MST FRI DEC 10 2010 /647 AM PST FRI DEC 10 2010/

...WIND ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS CANCELLED THE WIND
ADVISORY. 

 

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
953 AM MST THU DEC 9 2010

.UPDATE...CANCELED TO THE WINTER WEATHER ADVISORY FOR THE
MISSOULA/BITTERROOT VALLEYS...AS WELL AS THE POTOMAC/SEELEY LAKE
REGION.

&&

.DISCUSSION...SURFACE TEMPERATURES ARE WARMING AND BELIEVE ROAD
SURFACES SHOULD BE IMPROVING. THEREFORE THE WINTER WEATHER
ADVISORY WAS CANCELED FOR THIS MORNING.

&&

.AVIATION...THICK FOG WITH VISIBILITY BELOW ONE QUARTER OF A MILE WILL
CONTINUE TO AFFECT KMSO AND KSMN THROUGH THE MORNING. THE MISSOULA
AIRPORT HAS BEGUN FOG ABATEMENT SO SOME IMPROVEMENT IS EXPECTED AS
WELL AS LIGHT SNOW FLURRIES NEAR THE RUNWAY. MEANWHILE A PACIFIC
WEATHER SYSTEM WILL MOVE INTO NORTH CENTRAL IDAHO AND WESTERN
MONTANA THIS MORNING AND IMPACT AIR TRAFFIC THROUGH LATE FRIDAY.
MAIN AIRFIELDS IMPACTED WILL BE KGPI WITH LOWERED CEILINGS AND
VISIBILITIES FROM SNOW LATE THIS MORNING THROUGH MID MORNING
FRIDAY. NORTH CENTRAL IDAHO AIRFIELDS WILL BE IMPACTED BY
PRECIPITATION AS WELL AS STRONG WINDS AT GRANGEVILLE. KMSO AND
KBTM WILL SEE SOME ISOLATED SHOWERS FROM TIME TO TIME BUT OFFERING
ONLY IMPACTS TO AIRCRAFT ON APPROACH PASSING THROUGH VICINITY
SHOWERS. THE LATER ON KMSO/KBTM AND KGPI WILL SEE DETERIORATING
CONDITIONS AFTER 10/06Z AS SHOWERS ALONG A WEAK SURFACE BOUNDARY
LOWER CEILINGS AND VISIBILITIES.

&&

.PREV DISCUSSION... /ISSUED 825 AM MST THU DEC 9 2010/

UPDATE...EXTENDED THE WINTER WEATHER ADVISORY FOR THE
MISSOULA/BITTERROOT VALLEY AS WELL AS THE POTOMAC/SEELEY LAKE AREA
UNTIL 10AM MST THIS MORNING. ADDED SOME FREEZING FOG TO SOME
WESTERN MONTANA VALLEYS AND SALMON IDAHO AREA.

DISCUSSION...ROADWAYS ARE STILL REPORTED TO BE SLICK IN PORTIONS
OF WEST-CENTRAL MONTANA DUE TO ICE/SLUSH/FREEZING SLUSH THIS
MORNING. RADAR INDICATED THAT SCATTERED SHOWERS WHERE MOVING
ACROSS THE IDAHO PANHANDLE THIS MORNING...POTENTIALLY ADDING TO
SLICK CONDITIONS ONCE THEY ARRIVE BY MID-MORNING. AIR TEMPERATURES
AND ROAD SURFACE TEMPERATURES ARE EXPECTED TO WARM BY LATER THIS
MORNING TO HELP IMPROVE CONDITIONS. THUS...HAVE EXTENDED THE
WINTER WEATHER ADVISORY FOR PORTIONS OF WEST-CENTRAL MONTANA THIS
MORNING. COOL STABLE AIR TRAPPED IN THE VALLEYS ALSO PROMOTE SOME
FOG THIS MORNING.

AVIATION...FOG WILL AFFECT KMSO AND KSMN WITH PERIODIC REDUCTIONS
IN VISIBILITY AND LOWERED CEILING HEIGHTS THROUGH THE MORNING.
MEANWHILE A PACIFIC WEATHER SYSTEM WILL MOVE INTO NORTH CENTRAL
IDAHO AND WESTERN MONTANA THIS MORNING AND IMPACT AIR TRAFFIC
THROUGH LATE FRIDAY. MAIN AIRFIELDS IMPACTED WILL BE KGPI WITH
LOWERED CEILINGS AND VISIBILITIES FROM SNOW LATE THIS MORNING
THROUGH MID MORNING FRIDAY. NORTH CENTRAL IDAHO AIRFIELDS WILL BE
IMPACTED BY PRECIPITATION AS WELL AS STRONG WINDS AT GRANGEVILLE.
KMSO AND KBTM WILL SEE SOME ISOLATED SHOWERS FROM TIME TO TIME BUT
OFFERING ONLY IMPACTS TO AIRCRAFT ON APPROACH PASSING THROUGH
VICINITY SHOWERS. THE LATER ON KMSO/KBTM AND KGPI WILL SEE
DETERIORATING CONDITIONS AFTER 10/06Z AS SHOWERS ALONG A WEAK
SURFACE BOUNDARY LOWER CEILINGS AND VISIBILITIES.

PREV DISCUSSION... /ISSUED 404 AM MST THU DEC 9 2010/

.SNOW TO IMPACT NORTH CENTRAL IDAHO AND WESTERN MONTANA TODAY
THROUGH EARLY SATURDAY...

DISCUSSION...A SHORTWAVE AHEAD OF PACIFIC WEATHER SYSTEM BROUGHT
AN IMPRESSIVE SWATH OF FREEZING RAIN FROM SUPERIOR TO SEELEY LAKE
AND POINTS SOUTH OVERNIGHT. STILL HAVE SOME ISOLATED SHOWERS
BEHIND THIS EXITING FEATURE THAT CONTINUE TO BRING A MIX OF RAIN
AND FREEZING RAIN TO THE ABOVE MENTIONED AREAS THIS HOUR. WITH
MANY VALLEY TEMPERATURES REMAINING AT OR BELOW FREEZING THIS
MORNING...HAVE CONTINUED THE WINTER WEATHER ADVISORIES FOR
FREEZING RAIN FOR MISSOULA/BITTERROOT VALLEYS...THE SEELEY/SWAN
REGIONS AND ALONG THE I-90 CORRIDOR...HIGHWAY 200 AND HIGHWAY 12
EAST OF MISSOULA. FOR THE LOWER CLARK FORK REGION...WITH THE
PRECIPITATION ASSOCIATED WITH THE INCOMING PACIFIC WEATHER SYSTEM
ALREADY IMPACTING LOOKOUT PASS...AND POCKETS OF FREEZING RAIN THIS
MORNING FROM SUPERIOR TO POINTS EAST...JUST STARTED THE WINTER
STORM WARNING A FEW HOURS EARLIER.

THE STRONG MOIST JET IS ALREADY SPREADING SNOW TO EASTERN
WASHINGTON THIS HOUR AND WILL ENVELOP NORTHWEST MONTANA THROUGH
THE MORNING HOURS. THIS JET AND ASSOCIATED PLUME OF MOISTURE WILL
BRING WIDESPREAD PRECIPITATION TO NORTH CENTRAL IDAHO AND WESTERN
MONTANA TODAY THROUGH LATE FRIDAY...WITH SOME BLOWING SNOW ISSUES
OVER THE HIGHER TERRAIN INCLUDING THE PASSES. HAVE CONTINUED ALL
GOING WINTER WEATHER HEADLINES...AND ADDED SOME ADDITIONAL
HEADLINES TO NORTHWEST MONTANA. THE MAJORITY OF VALLEYS OF
NORTHWEST MONTANA ARE COLD ENOUGH TO SUPPORT SNOW FOR MUCH OF THE
EVENT. HOWEVER...THEY WILL HOVER NEAR FREEZING SO RATIOS WILL BE
ON THE LOW SIDE OVER THE 24-36 HOUR PERIOD. DESPITE AN EXPECTED
LONG DURATION OF SNOW...AMOUNTS WILL BE BELOW WARNING CRITERIA IN
THE VALLEYS. HAVE ADDED A WINTER WEATHER ADVISORY FOR THE
KOOTENAI/CABINET AND FLATHEAD/MISSION VALLEYS FOR TODAY THROUGH
FRIDAY LATE MORNING.

MODELS ARE HINTING THAT AS THE JET SHIFTS SOUTH LATE TONIGHT...A
BAND OF SNOW MAY DEVELOP ALONG A WEAK SURFACE BOUNDARY...IMPACTING
THE MISSOULA AND BITTERROOT VALLEYS. COULD MAKE COMMUTING INTERESTING FOR
FRIDAY MORNING WITH LIGHT SNOW ACCUMULATIONS IMPACTING ROADWAYS.

BREEZY WINDS WILL REMAIN OVER THE LOWER HELLS CANYON AND CAMAS
PRAIRIE MUCH OF TODAY INTO TONIGHT. STILL MONITORING THE STRONGER WIND
POTENTIAL OVER THE CAMAS PRAIRIE FOR LATE TONIGHT INTO EARLY
FRIDAY. THE MODELS STILL ADVERTISE A TIGHT SOUTH TO NORTH PRESSURE
GRADIENT...BUT DO NOT AGREE ON THE AMOUNT OF MIXING OF HIGHER
WINDS TO THE SURFACE. GIVEN MODEL DISCREPANCY HAVE CONTINUED THE
GOING FORECAST OF WIND SPEEDS JUST BELOW ANY HEADLINE
CRITERIA.

A SURFACE COLD FRONT WILL MOVE ACROSS SOUTHERN IDAHO FRIDAY
EVENING INTO SATURDAY MORNING LEAVING A MOIST AND UNSTABLE NORTHWEST
FLOW OVER WESTERN MONTANA. MODELS ARE STILL SHOWING THE POTENTIAL OF
SNOW BANDING OVER MAINLY NORTHWEST MONTANA. SATURDAY WILL BE THE
DRIER AND COOL DAY WITH SOME BREAKS IN THE CLOUDS. A WARM FRONT WILL
MOVE ACROSS THE REGION SUNDAY AND BRING ANOTHER CHANCE OF
PRECIPITATION. MONDAY A WEAK AND DIRTY RIDGE WILL BUILD INTO THE
REGION. THIS RIDGE WILL MOVE OFF TO THE EAST...LEAVING A MOIST
WESTERLY FLOW INTO WESTERN MONTANA AND NORTH CENTRAL IDAHO FOR THE
REST OF THE EXTENDED FORECAST PERIOD.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...WINTER STORM WARNING UNTIL 11 PM MST FRIDAY LOWER CLARK FORK
     REGION.

     WINTER WEATHER ADVISORY FROM 5 PM THIS AFTERNOON TO NOON MST
     FRIDAY FLATHEAD/MISSION VALLEYS.

     WINTER STORM WARNING UNTIL 11 PM MST FRIDAY WEST GLACIER REGION.

     WINTER WEATHER ADVISORY UNTIL NOON MST FRIDAY KOOTENAI/CABINET
     REGION.

     WINTER STORM WARNING FROM 5 PM THIS AFTERNOON TO 11 PM MST
     FRIDAY BITTERROOT/SAPPHIRE MOUNTAINS.

     WINTER STORM WARNING FROM 5 PM THIS AFTERNOON TO 5 AM MST
     SATURDAY POTOMAC/SEELEY LAKE REGION.

     WINTER STORM WATCH FROM THIS EVENING THROUGH LATE FRIDAY NIGHT
     BUTTE/BLACKFOOT REGION.

ID...WINTER STORM WARNING FROM 4 PM THIS AFTERNOON TO 10 PM PST
     FRIDAY ABOVE 2500 FEET FOR THE NORTHERN CLEARWATER
     MOUNTAINS.

     WINTER STORM WARNING FROM 4 PM THIS AFTERNOON TO 10 PM PST
     FRIDAY ABOVE 3000 FEET FOR THE SOUTHERN CLEARWATER
     MOUNTAINS.

&&

SHORT TERM...MSJ
LONG TERM....KOLATA
AVIATION...DICKERSON