Area Forecast Discussion
Issued by NWS Missoula, MT

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000
FXUS65 KMSO 101022
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
322 AM MST Sat Dec 10 2016

.DISCUSSION...
Widespread snow showers continue across north-central Idaho and
western Montana early this morning. Valley locations have seen
several inches of accumulating snowfall, creating slick, slow,
snow-covered roads with periods of lower visibility for
travelers. Winds have remained relatively light which has kept
blowing snow limited. Hi-res models and model soundings are still
indicating the chance for convective snow bands forming later
this morning, potentially producing moderate to heavy snowfall
intensities over short periods of time. Prolonged stationary snow
bands may have significant impact on travel and will be monitored
closely.

The next disturbance of abundant moisture will begin moving in
late tonight, bringing periods of additional widespread
accumulating snowfall. Temperatures will remain below freezing
overnight tonight which will keep roadways slick, especially if
they have become snow-packed and icy over this past week.
Temperatures will trend warmer for Sunday, but most locations will
remain cold enough for snow throughout the day and night.

Perhaps of greater concern will be yet another round of abundant
moisture moving into the region Monday, which will be met by a
cold arctic airmass dropping down from Canada. This airmass is
capable of producing cold, gusty winds, and promoting more
accumulating snow with blowing snow. Temperatures will rapidly
lower by Monday night/Tuesday, particularly for northwestern
Montana and along the Continental Divide. By Tuesday, cold air
will be in place and the gusty winds will support dangerous wind
chills and blowing/drifting snow across the area. Clearing skies
and weakening winds late Tuesday/Wednesday morning could create
the coldest minimum temperatures of this season, thus far, for
many locations.

Long range models suggest another surge of very cold air moving
over the region by late week, bringing additional cold air and
snowfall concerns.

&&

.AVIATION...Periods of light to moderate snow showers will
persist for all terminals this morning, especially in northwest
Montana. Mountain obscurations and IFR visibility/ceilings will be
common. Airports impacted include KMSO, KGPI, KSMN, and KBTM.
Moderate to heavy convective snow-bands are possible after
10/1200Z this morning, and will be a possibility through the
morning afternoon. Any snow bands that form may produce very low
visibility, intense snowfall rates, and turbulent conditions.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Winter Weather Advisory until 11 AM MST this morning
     Butte/Blackfoot Region.

     Winter Weather Advisory until 11 AM MST this morning
     Bitterroot/Sapphire Mountains.

     Winter Weather Advisory until 11 AM MST this morning
     Missoula/Bitterroot Valleys.

     Winter Weather Advisory until 11 AM MST this morning
     Kootenai/Cabinet Region...Lower Clark Fork Region...
     Potomac/Seeley Lake Region...West Glacier Region.

     Winter Weather Advisory until 11 AM MST this morning
     Flathead/Mission Valleys.

ID...Winter Weather Advisory until 11 AM MST this morning Eastern
     Lemhi County...Western Lemhi County.

     Winter Weather Advisory until 10 AM PST this morning Northern
     Clearwater Mountains...Southern Clearwater Mountains.

     Winter Weather Advisory until 8 AM PST this morning Lower Hells
     Canyon/Salmon River Region...Orofino/Grangeville Region.

&&

$$



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