Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 050945

Area Forecast Discussion
National Weather Service Boise ID
245 AM MST Mon Dec 5 2016

.SHORT TERM...Today through Tuesday...Much colder air has entered
the region behind a strong cold front that moved through
yesterday. A second shot of cold air, along with limited moisture,
will impact us late this afternoon through Tuesday. Light snow
associated with the system will enter southeast Oregon and Baker
County late this afternoon and spread southeast across the area
overnight. Accumulations are expected to be light and there are no
advisories or warnings for this system. Temperatures will be cold,
with highs today and tomorrow in the 30s in the lower elevations
and teens to 20s at higher elevations. Winds will not be
significant with this system. A cold front will enter southeast
Oregon and Baker County Tuesday morning and move through southwest
Idaho Tuesday afternoon.

.LONG TERM...Tuesday night through Sunday...Tuesday night the
northern Intermountain Region will be under a very cold upper
level trough. Precipitation will have ended by Wednesday morning.
With fresh snow cover, clearing skies, and light winds,
temperatures could fall to the 10 to 15 degree range in the Snake
River Valley, with even colder readings at higher elevations.
Highs on Wednesday will be below freezing everywhere for the
first time since January 2. The cold weather will be short lived.
Starting Wednesday night, a change to westerly flow aloft will
bring moist and milder Pacific air inland. Snow will spread across
southeast Oregon and southwest Idaho late Wednesday night through
Thursday, with 1 to 2 inches accumulating in the valleys and 2 to
4 inches in the mountains. Precipitation will change to rain in
the lowest valleys Thursday night, but a period of freezing rain
is possible during the transition. All areas below 5000 feet will
see rain on Friday, but in the central Idaho and Owyhee Mountains,
an additional 3 to 5 inches of snow is possible. Scattered snow
showers will continue over the weekend with near normal


.AVIATION...VFR today. Expect deteriorating conditions tonight as
snow spreads across the area from the west. Surface winds variable
mainly under 10 kts. Winds aloft at 10k ft msl northwest 15-25 kts
becoming west 10-20 kts after 18z.





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