Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 021624
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
924 AM MST MON MAR 2 2015

.UPDATE...Issued winter storm warnings for portions of west
central Montana.


&&

..DIFFICULT TRAVEL FOR LATER THIS AFTERNOON AND THE EVENING
   COMMUTE IN WESTERN MONTANA FROM SNOW AND BLOWING SNOW...

..SUB ZERO WIND CHILLS LATE THIS EVENING THROUGH TUESDAY MORNING...

.DISCUSSION...The combination of accumulating snow, blowing snow,
cold wind chills and refreeze of roadways late this afternoon
through tonight appear to create high impacts for west central
Montana.


&&

.AVIATION...Strong gusty northeast winds from an arctic front
will impact KGPI, KBTM and KMSO from 02/2000z through 03/0400z.
Expect wind gusts of 25-35 mph. A weather disturbance combined
with this arctic push will produce snow, intense at times at all
terminals. The biggest impact will be lowering visibilities due to
the snow and blowing snow. Strong winds and snow will diminish
after midnight. Light snow with some gusty winds will impact KSMN
this evening.


&&

.PREV DISCUSSION... /ISSUED 414 AM MST MON MAR 2 2015/

DISCUSSION...A strong weather disturbance approaching from
British Columbia will interact with an arctic air mass moving
across the divide and produce a combination of snow, strong winds
and much colder temperatures. The initial push of arctic air and
snow boundary will occur in Northwest Montana along the
Continental Divide into the Flathead valley and far Northwest
Montana mid afternoon through mid evening. TIMING of this initial
push is from around noon through the early evening hours.

This disturbance and arctic air will move south and have its
greatest impact in West Central and Southwest Montana. TIMING for
this is between 3 pm and midnight. Models are showing a well
defined boundary of snow developing along the I-90 Corridor from
Superior through Missoula to Butte. The Mission, Missoula and
Bitterroot Valleys will all be impacted with several inches of
snow. Strong east-northeast winds will produce blowing snow.

THE BIGGEST ISSUE OR IMPACT WILL BE THE POSSIBILITY OF INTENSE
SNOWFALL RATES AT TIMES THUS QUICKLY DETERIORATING ROAD CONDITIONS
AND VISIBILITY DURING THE LATE AFTERNOON AND EVENING COMMUTE.

IMPACTS FROM THIS SYSTEM, ALL PRODUCING DIFFICULT TRAVEL:

-  General snowfall amounts of 2-4 inches. Localized areas may
   receive intense snowfall rates increasing amounts.

-  Northeast winds gusting to 35 mph at times producing blowing
   snow and low visibility, mainly near Badrock Canyon and the
   I-90 corridor near Hellgate Canyon.

-  1-2 inches of snow in the Camas Prairie and Grangeville.

-  Sub Zero wind chills later this evening through Tuesday
   morning in Western Montana. The coldest wind chills will be in
   southwest Montana and along the Continental Divide. Also pets
   and newborn livestock will be vulnerable to the harsh weather
   conditions.

Dry conditions are expected through next weekend. A gradual rise
in temperatures to near normal readings in the 40s are expected
by Friday with temperatures possibly in the lower 50s for the
weekend.

AVIATION...Strong gusty northeast winds from an arctic front
will impact KGPI, KBTM and KMSO from 02/2000z through 03/0400z.
Expect wind gusts of 25-35 mph. A weather disturbance combined
with this arctic push will produce snow, intense at times at all
terminals. The biggest impact will be lowering visibilities due to
the snow and blowing snow. Strong winds and snow will diminish
after midnight. Light snow with some gusty winds will impact KSMN
this evening.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...WINTER STORM WARNING from 2 PM this afternoon to 11 AM MST
     Tuesday Bitterroot/Sapphire Mountains...Butte/Blackfoot
     Region...Lower Clark Fork Region...Missoula/Bitterroot
     Valleys...Potomac/Seeley Lake Region.

     WINTER STORM WARNING until 11 AM MST Tuesday Flathead/Mission
     Valleys.

     WINTER WEATHER ADVISORY until 8 AM MST Tuesday West Glacier
     Region.

     WINTER WEATHER ADVISORY until 8 AM MST Tuesday Kootenai/Cabinet
     Region.

ID...WINTER WEATHER ADVISORY from 5 PM this afternoon to 11 AM MST
     Tuesday Eastern Lemhi County...Western Lemhi County.

     WINTER WEATHER ADVISORY from 1 PM this afternoon to 10 AM PST
     Tuesday Lower Hells Canyon/Salmon River Region...Northern
     Clearwater Mountains...Orofino/Grangeville Region...
     Southern Clearwater Mountains.

&&

$$



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