Winter Weather Advisory 21, NWS Missoula, MT

870 
WWUS45 KMSO 281238
WSWMSO

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
538 AM MST SAT FEB 28 2015


MTZ007-281800-
/O.CAN.KMSO.WW.Y.0021.000000T0000Z-150228T1800Z/
/O.EXB.KMSO.WC.Y.0003.150228T1300Z-150228T1800Z/
BUTTE/BLACKFOOT REGION-
538 AM MST SAT FEB 28 2015

...WIND CHILL ADVISORY IN EFFECT UNTIL 11 AM MST THIS MORNING...
...WINTER WEATHER ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WIND CHILL
ADVISORY...WHICH IS IN EFFECT UNTIL 11 AM MST THIS MORNING. THE
WINTER WEATHER ADVISORY HAS BEEN CANCELLED. 

* IMPACTS/TIMING: NORTHEAST WINDS WILL PRODUCE LOW WIND
  CHILLS,LEADING TO RAW CONDITIONS FOR PEOPLE AND ANIMALS THIS
  MORNING.

* WIND CHILLS: 20 BELOW TO 0 THIS MORNING...COLDEST ALONG HIGHER
  VALLEYS NEAR THE CONTINENTAL DIVIDE.

* LOCATIONS IMPACTED INCLUDE...BUTTE...GEORGETOWN LAKE...HIGHWAY 
  12 GARRISON TO ELLISTON...HOMESTAKE PASS...MACDONALD PASS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

$$

IDZ009-010-MTZ006-281345-
/O.CAN.KMSO.WW.Y.0021.000000T0000Z-150228T1800Z/
WESTERN LEMHI COUNTY-EASTERN LEMHI COUNTY-
BITTERROOT/SAPPHIRE MOUNTAINS-
538 AM MST SAT FEB 28 2015

...WINTER WEATHER ADVISORY IS CANCELLED...

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


$$

MTZ002-043-281800-
/O.CON.KMSO.WC.Y.0003.000000T0000Z-150228T1800Z/
WEST GLACIER REGION-POTOMAC/SEELEY LAKE REGION-
538 AM MST SAT FEB 28 2015

...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THIS
MORNING...

A WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THIS
MORNING. 

* IMPACTS/TIMING: NEGATIVE SINGLE DIGIT TEMPERATURES COMBINED 
  WITH NORTHEAST WINDS WILL CAUSE RAW CONDITIONS FOR PEOPLE AND 
  ANIMALS OUTSIDE TONIGHT. 

* WIND CHILL VALUES: 20 BELOW TO 0...COLDEST ALONG VALLEYS NEAR
  THE CONTINENTAL DIVIDE.

* LOCATIONS IMPACTED INCLUDE...BAD ROCK CANYON...ESSEX...HIGHWAY 
  83 BIGFORK TO SWAN LAKE...MARIAS PASS...POLEBRIDGE...HIGHWAY 
  200 BONNER TO GREENOUGH...HIGHWAY 83 SEELEY LAKE TO CONDON...I-
   90 EAST MISSOULA TO BEARMOUTH

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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
421 AM MST FRI FEB 27 2015

...VERY COLD WIND CHILL PRESENT AT TIMES THROUGH NEXT WEEK...

.DISCUSSION...

A broad Pacific storm system embedded within northerly flow aloft
will move west of the Northern Rockies today through Saturday,
drawing snow shower activity across the region. The orientation
of this system is such that relatively cold air east of the
Continental Divide will continue to be drawn westward over time. A
drop in temperatures and very cold wind chill will be most evident
along the Divide and near terrain gap features in western Montana,
such as Hellgate Canyon east of Missoula and Badrock Canyon east
of Columbia Falls. Snow showers may create hazardous driving
conditions for a time across the Camas Prairie of Idaho and over
Lost Trail Pass through Saturday.

After a cold start Sunday morning, the focus will turn to a
winter storm expected to impact the region Monday afternoon into
Tuesday. Light snow across northwest Montana on Monday afternoon
will quickly spread southward Monday night, accompanied by a surge
of arctic air. A combination of snow, gusty northeast winds, and a
sudden decrease in temperatures will likely present several
significant impacts:

* Those traveling across western Montana and north central Idaho
  will likely see road conditions quickly deteriorate with slick
  conditions and potentially reduced visibility in areas of
  blowing snow. Several inches of snow accumulation will be
  possible.

* Sensitive livestock such as newborns and those with outdoor
  interests will also be impacted by both cold temperatures and
  potentially subzero wind chills. Temperatures running 20-25
  degrees below normal will continue into Wednesday before a
  gradual warm up begins.

Most weather models suggest that mainly dry conditions will be
present across the Northern Rockies from Wednesday evening through
the end of next week. Temperatures during this time appear fairly
typical for this time of year.

&&

.AVIATION...

Low and mid level cloudiness will be evolving over the Northern
Rockies during the next 24 hours. Some snow showers, mainly across
north central Idaho and along the Continental Divide, may temporarily
limit visibility and ceilings near area terminals. Otherwise,
relatively cold air from east of the Divide will be rushing
westward, creating some wind gusts to 25 knots to KGPI and KMSO by
28/0000Z.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.
&&