Area Forecast Discussion
Issued by NWS Pocatello, ID

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040
FXUS65 KPIH 270949
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
349 AM MDT Thu Apr 27 2017

.SHORT TERM...Today through Saturday. Strong winds are moving into
the area behind an exiting cold front bringing moderate to strong
winds. A wind advisory remains in effect for the Eastern Magic
valley, Southern Highlands and the Lower Snake river plain now
through early evening today. A convergence line is setting up
over the Upper Snake river plain as Northerly cold air drops down
from the Montana divide and is meeting the strong West Southwest
flow from the Lower Snake river plain. Expect Scattered to
Numerous rain and snow showers mainly over the Snake River plain
and Eastern Highlands today. Expect 1 to 2 inches of snow above
5000 feet with locally higher amounts of 2 to 5 inches for the Big
Hole mountains, Caribou Highlands and the Wasatch mountains. Use
caution over Pine Creek pass, Fish Creek pass, Georgetown summit
and all passes on the Wyoming border. Another wave drops down from
Montana this afternoon into Friday which will bring continued
light rain and snow showers mainly for the Snake river plain and
the Eastern highlands. Snow will likely drop to the valley floor
tonight into Friday morning with up to 1 inch of valley snow
possible. High pressure starts to build into the area late Friday
into Saturday bring drier conditions. Expect well below normal
temperatures through Saturday morning before moderating to
slightly below normal by Saturday afternoon. Valley temperatures
will drop to the upper twenties to the low thirties with mountain
temperatures dropping to the upper teens and low twenties Friday
and Saturday mornings. Colder temperatures and cold cover will
retard snow melt through the period. Wyatt

&&

.LONG TERM...Sunday through Thursday night. Models continue to move
minor waves thru the northwest flow aloft...resulting in mainly mtn
showers Sun thru Tue. The northwest flow will also keep temps on the
cool side. Upper ridging over the west amplifies on Wed...resulting
in dry conditions and warming temps both Wed and Thu.  Thu temps
actually look springlike. Nothing lasts forever as models show an
upper trof pushing thru the ridge Thu night...with precip moving
into the central mtns. Hedges

&&

.AVIATION...An convergence zone is moving southward thru the Snake
River Plain early this morn...with showers reducing cigs at KIDA...
KDIJ...and KPIH. Strong west winds will shift to more northerly and
diminish as the convergence zone passes. Westerly winds are
expected to regain strength this afternoon with continued showers
into the eve. Hedges

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Wind Advisory until 8 PM MDT this evening for IDZ017-021-022.

&&

$$



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