Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 181000

Area Forecast Discussion
National Weather Service Boise ID
400 AM MDT Wed Oct 18 2017

.SHORT TERM...Today through Friday...Westerly flow today will
shift to the southwest on Thursday ahead of an approaching upper
trough and cold front. Conditions are dry and mild with
temperatures 5-10 degrees above normal through Thursday.
Winds are light today, but increased southwest flow aloft will
bring breezy conditions to higher terrain on Thursday.
Precipitation moves into southeast Oregon Thursday evening and to
southwest Idaho overnight. The flow aloft will initially favor
precipitation development in the mountains Thursday night. Forcing
from passage of the surface front and upper dynamics will bring
precipitation to most locations by midday Friday. Showers will
continue in the cooler air mass behind the front Friday
afternoon. Snow levels drop from around 7k feet Thursday night to
around 5k feet on Friday. Expect little accumulation below 6k
feet with sites above 6k feet seeing 1-4 inches of snow by Friday
afternoon. High temperatures drop 15-20 degrees from Thursday to

.LONG TERM...Friday night through Tuesday...A strong moisture push
will come into the PACNW early Saturday, and with a southerly
surface flow, widespread overrunning precip is expected across much
of the area. Snow levels are expected to rise rapidly to 8500 ft or
more through the day. By Sunday, precip remains in the northern
areas of the CWA.  Models are in good agreement of a ridge building
over the area for Monday and beyond keeping conditions dry and
temperatures closer to normal.


.AVIATION...VFR. Surface winds: Variable direction, generally less
than 10 kts. Wind may increase to around 15 kts after 18z Wednesday,
mainly across eastern Oregon and the potentially into KMYL in Idaho.
Winds aloft at 10kft MSL: West 20-30 kts.





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