Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 271014
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
314 AM MST Fri Jan 27 2023

.SHORT TERM...Today and Saturday. Satellite imagery continues to
show northwest flow and widespread cloud cover over our area with
a trough moving through this northwest flow. The trough is currently
located over northern Idaho. Current radar imagery shows returns
over our entire eastern and southeastern areas. Plus, grip levels
are low over the same areas. Webcams show widespread snow as
well. Additionally, google traffic shows slower traffic speeds over
the same areas too. Models continue to show a surface
low/troughing over northern Idaho now, which will continue to
bring a steady stream of moisture over our eastern and
southeastern areas in northwest flow through the day today. Models
show moisture letting off some by late this afternoon until
around midnight. After midnight models show the surface low moving
southeast over our eastern/southeastern areas bringing back good
moisture. By Saturday afternoon the surface low looks to leave our
area and moisture backs off some. Models continue to show
moderate winds over the area, especially over ridgetops and our
southwestern areas where gusts of 40 to 45 mph are likely this
afternoon. Winds remain breezy into Saturday morning before
backing off some by Saturday afternoon. Snow amounts still look
moderate to heavy, especially across our eastern and southeastern
areas where 1 to 2 feet of snow is likely, especially for the Big
Holes and Wasatch mountains. Expect 6 to 12 inches for mountains
elsewhere across our eastern areas (along the Wyoming border) and
our southeastern areas (Caribou Range, Blackfoot mountains and the
Marsh/Albion Highlands). The Snake Plain looks to get around 1 to
3 inches along the eastern edges, in particular. The eastern
benches across the Snake plain will likely get 3 to 6 inches of
snow. Though the Eastern Magic valley and Raft river region (down
low) won`t get much snow, what snow that does occur will be
blowing and drifting with the moderate to strong winds. All winter
weather advisories and warnings will be continued as before with
no changes in area or timing. Though there will be a slight break
Saturday afternoon into early evening, models still show very cold
air moving into the area Saturday night into Sunday bringing good
snow chances again. Depending on how much break will occur,
advisories and warnings may just get extended into Sunday.
TW

.LONG TERM...Positively tilted trof moves south with continuing
snow early Saturday morning in the Snake River Plain and southern
mountains mainly. Expect about a half inch additional snowfall in
the Snake River Plain early Sunday with 1 to 3 inches in the
southern mountain regions. Snow should be relegated to the far
southern regions Sunday with dry and extremely cold conditions in
the central mountains to Upper Snake Highlands. Highs Sunday will
range from single digits in the north to teens to low 20s in
southern regions. The extremely cold conditions will spill over
all of southeast Idaho Sunday night into the middle part of next
week. All of the region should fall below zero overnight Sunday
with some readings colder than 20 below from the central mountains
east through the Arco Desert to the Upper Snake Highlands.
Northerly winds will likely push wind chill readings or apparent
temperature readings into the 30 to 40 below range in those areas.
High temperatures Monday will range from around zero to 15 in
southern valleys. Expect below zero lows everywhere again on
Tuesday morning then a warming trend will set in with highs by
Wednesday into the 20s and 20s and 30s everywhere by Friday.
Monday through Thursday should be dry with the next chance for
snow after Sunday not until Friday.
GK

&&

.AVIATION...Expect periods of snow with IFR to MVFR conditions all day at PIH,
IDA and DIJ which are the sites likely to be most affected by the
winter storm.   SUN and BYI should be mainly spared from the worst
of it and stay VFR through today as the storm is an extreme eastern
part of the state event.  Impact in BYI will be strong winds with
gusts of 25 to 35 knots out of the west expected today.  Wind
gusts over 20 knots will be likely at all sites today.
GK

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory until 5 PM MST Saturday for IDZ053-054-
059-061.

Winter Weather Advisory until 5 PM MST Saturday for IDZ055>057.

Winter Storm Warning until 5 PM MST Saturday for IDZ058-060-
062>066.

&&

$$


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