Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 192124

Area Forecast Discussion
National Weather Service Boise ID
224 PM MST Fri Jan 19 2018

.SHORT TERM...Tonight through Monday...As last night`s system
exits to the east today,it will take the vast majority of the
precipitation with it. A ridge will build in aloft in advance of
the next system...due to arrive Sunday and last into Monday. This
next system will be cold enough to bring snow down to around 2700
feet Sunday into Monday, with light to moderate snow amounts.
Temps tonight through Monday will be near normal. Saturday will be
mainly dry, with only a chance of snow showers mainly in the
northern mountains. Sunday, clouds will spread in rapidly from the
west, and snow showers will move into southeast Oregon from mid-
morning through the afternoon. A few showers will reach across the
border into southwest Idaho from mid-afternoon on. In the evening,
precip will become heavier and light to moderate snow is expected.
This will continue after midnight before tapering down Monday
morning. Advisory level snow is possible in some areas, but
details remain elusive and no watches or advisories will be issued
at this time.

.LONG TERM...Monday night through Friday...Fairly active pattern
persists. Looks like a bit of a lull in precip for late Monday
night and early Tuesday, with fast westerly flow aloft over the
area. Could still see some mountain showers during this period.
Next system approaches Tuesday with a warm front going by Tuesday
night. Flow is amplifying again by this point, such that snow
levels look like they will rise up to around 4K to 5K feet MSL on
Wednesday and Wednesday night, with ample moisture creating a
significant amount of mountain snow and valley rain. The trough
goes by on Thursday, lowering snow levels back down to all areas,
but the deep moisture cuts off around the same time. Some showers
in northwest flow look like they will continue through Friday.
Temperatures look to be slightly above normal on Tuesday/Wednesday
and back down near normal for Thursday/Friday.


.AVIATION...Mostly VFR. MVFR snow showers diminishing after
sunset. Mid level clouds overnight should limit valley fog
development, but believe there could be some MVFR or IFR fog form
in lower Snake River Valley 10-14Z. Surface winds, northwest
around 10 kts diminishing after sunset. Winds aloft near 10 KFT
MSL: northwest 25 kts, diminishing to 15 kts on Saturday.





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