Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 231559

Area Forecast Discussion
National Weather Service Boise ID
959 AM MDT Fri Mar 23 2018

.DISCUSSION...Fairly quiet conditions anticipated today with
lingering showers possible over higher terrain. Low pressure
anticipated to dive further south along the Pacific coastline
today and eventually move inland and across the Pacific Northwest.
As this system progresses, it is expected to send additional
moisture over the area beginning Saturday morning. Snow levels
will decrease as this system moves further inland, with valley
snow possible by Sunday. No immediate updates needed to current


.AVIATION...Mainly VFR with patchy mountain obscuration today.
Isolated snow showers over the central ID mountains this morning
producing local IFR. Snow showers developing west of BNO-BKE and
east of JER-TWF after 06z/Sat. Surface winds becoming S-SW 10-20kt
during the afternoon, except S-SE in the Treasure and Baker Valley.
Winds aloft at 10k ft MSL: Southwest 25-35kt.

Weekend outlook...Scattered snow showers expected over the higher
terrain with mountain obscuration.


SHORT TERM...Today through Saturday...A drier and colder air mass
has filtered into the region behind Thursday`s strong cold front.
More than 50 cloud-to-ground lightning strikes occurred with the
front`s passage, with many striking the Lower Treasure Valley.
The associated upper level trough, anchored offshore, will send a
shortwave trough inland across southeast Oregon Friday night, and
southwest Idaho Saturday morning; this will bring a chance of
rain and snow showers and a brisk southwesterly wind across
southeast Oregon and along the NV-ID border. Snow levels will vary
between about 3000-4500 feet Friday. Behind the shortwave trough and
its associated cold front, snow levels will drop to valley floors
for a cooler than normal Saturday; temperatures will drop to
about 10 degrees below the norm. Snow showers will bring about
1-3 inches of accumulation to the higher elevations late Friday
and Saturday; valleys will see little to no accumulation.

LONG TERM...Saturday night through Friday...An upper level
trough will move onshore into the PacNW Saturday night, and cross
the area Sunday into Sunday evening, spreading snow showers as it
moves through. Residual moisture will result in mountain showers
again Monday. Ridging will build in behind the trough, with just
enough moisture reaching the West Central Mountains to maintain a
slight chance of showers there Tuesday and Wednesday. We expect
Thursday to be dry. By late Friday, moisture returning on
northwest flow aloft warrants a slight chance of showers in the
mountains once again. Temps will start out around 10 degrees below
normal Sunday and Monday. As the ridge moves in, readings will
rise to near normal Wednesday, and become slightly above-normal
Thursday and Friday.





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