Area Forecast Discussion
Issued by NWS Missoula, MT

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FXUS65 KMSO 111058
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
358 AM MST THU FEB 11 2016

.DISCUSSION...Moisture streaming over the apex of the ridge of
high pressure today will keep continuous cloud cover and
developing mountain snow showers, with chances increasing later tonight
into Friday. The main source of moisture will occur after midnight,
and will gradually lift northwards from Oregon and spread across
Idaho and western Montana through Friday morning. During this
time, valleys will begin to see precipitation falling in the form
of rain throughout the day Friday. During the same time frame,
snow levels will rise to 6500 feet and higher, which will result
in rain falling at many mountain passes. By Friday night, snow
levels will once again begin to lower, helping to change rain to
snow at mountain pass level.

Snow levels will continue to fluctuate each day through the middle
of next week, however mostly rainfall is anticipated at mountain
pass elevations (5000 to 7000 feet) and lower. The most impressive
period of rainfall will be Saturday through Sunday night, with the
Clearwater Range in north central Idaho having the greatest
precipitation potential (up to 1.50 inches). Considering the
warming temperatures and rainfall on top of snow, there may some
runoff issues, particularly along steep highway embankments (such
as US Highway 12 in Idaho). Otherwise, relatively mild
temperatures and some periods of gusty winds (particularly at high
elevations) are anticipated through the middle of next week.

The pattern is expected to cool after the middle of next week,
with snow possibly reaching as low as 2500 feet by overnight
Thursday. Hazardous winter driving conditions may return over this
time as well, likely concentrated during overnights through each
morning.

&&

.AVIATION...Patchy, shallow fog is once again possible at KGPI
this morning, but overall fog across the Northern Rockies should
not be as prevalent as in days past, due to increased cloud cover
and an incoming weather system. Mountain snow showers may develop
through this evening and overnight, leading to lowering ceilings
and visibilities from precipitation as it reaches valley floors,
mainly after 12/0600Z and onward. These type of degradations to
aviation activity are possible, if not likely, at all terminals.

&&

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

$$


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