Area Forecast Discussion
Issued by NWS Pocatello, ID

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438
FXUS65 KPIH 172100
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
200 PM MST Wed Jan 17 2018

.SHORT TERM...Tonight through Saturday. High pressure ridge over
the region will shift east with moist southwest flow moving in
from the west as a frontal boundary moved into the Pacific NW.
Upper closed Low off the British Colombia coast will weaken and
move into the Pacific NW as an open upper level trof and the
associated cold front will move into central Idaho Thursday night
and swing through southeast Idaho Friday morning and afternoon.
Substantial warm air ahead of this system will result in snow
levels at and above 7000 feet and then fall to valley floors
Friday morning. Snow amounts above 6500 feet likely to be in the 1
to 6 inch range with greater amounts focused on higher elevations
of the Central Mountains, Southeast Highlands and Island Park
region. The vast majority of the Snake River Plain will receive
rain with light snow possible on benches and portions of the
upper valley. Snow accumulation in these areas will likely be an
inch or less. Precipitation will linger over the Eastern
Highlands into Friday afternoon and taper off during the evening
hours. Expect a break in precipitation for Saturday in advance of
the next system. DSH

.LONG TERM...Sunday through Thursday. A very active weather
pattern for the last full week of January. On Sunday expect a few
lingering showers behind the exiting storm mainly along the Idaho
Wyoming border with seasonal temperatures. Patchy valley fog is
possible. Sunday night into Monday a fast moving weather system
and cold front will push through with moderate snow impacts in the
mountains and light snow in the valleys. A break on Tuesday with
possible valley fog developing. Wednesday a large low pressure
system will push into the Pacific Northwest and begin to drop into
the intermountain region with possible moderate to high impacts
Thursday into Friday with widespread snow. vp

&&

.AVIATION...Expect widespread VFR conditions through this evening
and daytime hours tomorrow with ceilings dropping down to around
5000 to 8000 agl. One exception will be KIDA which may experience
LIFR conditions briefly Thursday morning due to fog and associated
ceiling. Bigger concern will be large storm system moving in
Thursday evening through Saturday which will produce widespread
MVFR to IFR conditions due to snowfall, low visibilities and
ceilings. vp

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory 5 PM MST Thursday until 12 PM MST Friday
for the Sawtooth Mountains above 6500 feet.

&&

$$



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