Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 202038

Area Forecast Discussion
National Weather Service Boise ID
238 PM MDT Wed Sep 20 2017

.SHORT TERM...Tonight through Friday...The cold front should
generally push through the area by this evening, with cooler
conditions expected. Showers to continue across the area tonight,
with the Western Magic Valley looking to be the most favorable
area for activity tonight. Meanwhile, residual moisture from the
system will leave the threat for showers through the next couple
of days as the trough closes off to become an area of low
pressure. As the low sits around the ID/OR border on Thursday, we
can expect lighter wind. Models then showing the low moving east
on Friday, with wraparound moisture expected into central Idaho to
keep showers present. Temperatures will remain 15-20 degrees
below normal through at least Friday.

.LONG TERM...Friday night through Wednesday...Upper level trough axis
will be just to the east of the CWA by Saturday, which will dry
out conditions in the northerly flow. A slight chance of showers
exists Saturday afternoon in the Idaho Central Mountains with
lingering moisture. As a ridge builds off the coast, the northerly
flow will continue with a shortwave or two coming down the
divide, bringing nothing more than cloud cover to the area through
Monday. For Tuesday and beyond, the ridge will continue to move
east, until it is directly overhead by midweek. Temperatures will
be steadily increasing each day, to near normal by early to mid
next week.


.AVIATION...Showers continuing today with a cold front passage. VFR
with MVFR in showers. A few thunderstorms possible through sunset.
Precipitation tapering off from NW to SE after sunset with showers
lingering overnight along the ID/NV border. Surface winds becoming
northwest with gusts to 30 kts through late evening. Winds aloft
near 10 KFT MSL: WSW 30-40 kts, then after 21/06Z becoming west 15-
20 kts. Slight chance of IFR fog developing early Thursday morning
in mountain valleys, including KMYL.





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