Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 261101

Area Forecast Discussion
National Weather Service Missoula MT
401 AM MST Sun Feb 26 2017

...Slick roads this morning and evening...

.DISCUSSION...Winter impacts have already been observed from the
Camas Prairie east to western Montana early this morning. Snow
intensities have ranged between light and moderate, so expect
slick travel at times today across the Northern Rockies. One
change with this morning`s forecast package includes increasing
the chance for snow across southwest Montana this evening.
Portions of Interstate 90 and Highway 200 east of Missoula may
experience snow to cause slick conditions. The Missoula and
Bitterroot Valleys may also experience periods of snow this
evening and tonight. The backdoor cold front will lose steam as
it heads towards the Missoula area tonight, with gusty east winds
at Hellgate Canyon.

Moist, unstable westerly flow will continue all week causing snow.
In Central Idaho and far Western Montana the mountains will see
over a foot of new snow by Tuesday evening. Lower elevation
valleys will see an inch or two in Central Western Montana.
Northwest Montana valleys will likely see 4 to 6 inches in the
same period, while the mountains will receive up to a foot of new

Tuesday evening the snow will remain, but lighten as winds pick
up. Wednesday afternoon will be windy with gusts around 20 mph or
more. Thursday and Friday will bring a break from the wind and
remain breezy with continuing mountain snow showers.

Models are starting to agree well on a strong wind event next
weekend with many locations receiving 30 to 40 mph wind gusts. High
elevation valleys like Anaconda and Butte may see very strong
winds in excess of 50 mph. This will cause difficult travel for
high profile vehicles on north-south roads like Highway 93, and
may even be dangerous cross winds on Interstate 90 from Garrison
Junction to Anaconda.


.AVIATION...Periods of snow, reduced visibility and ceilings are
expected at most of the terminals today through early Monday. A
backdoor cold front will be moving towards KGPI by 26/2000Z causing
the winds to shift to the northeast. This front will also be
moving south on the east side of the Continental Divide and will
push westwards towards Helmville and MacDonald Pass sometime
after 26/2300Z. Another impact to aviation will be the chance for
scattered snow showers, capable of producing moderate to heavy
snow bursts across southwestern Montana between 26/2100Z and
27/0600Z. Snow shower activity will lessen a little bit by
27/1500z, but then ramp again across the area by Monday afternoon.


MT...Winter Weather Advisory until 11 PM MST this evening
     Bitterroot/Sapphire Mountains.

     Winter Weather Advisory until 11 PM MST this evening
     Flathead/Mission Valleys.

     Winter Weather Advisory until 11 PM MST this evening West
     Glacier Region.

     Winter Weather Advisory until 11 PM MST this evening
     Kootenai/Cabinet Region.

     Winter Weather Advisory until 11 PM MST this evening for I-90
     Lookout Pass to Haugan in the Lower Clark Fork Region.

ID...Winter Weather Advisory until 10 PM PST this evening Lower Hells
     Canyon/Salmon River Region...Orofino/Grangeville Region.

     Winter Weather Advisory until 10 PM PST this evening Southern
     Clearwater Mountains.

     Winter Weather Advisory until 10 PM PST this evening Northern
     Clearwater Mountains.


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