327 
FXUS65 KBOI 092050
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
250 PM MDT Tue Oct 9 2018

.SHORT TERM...Tonight through Friday Night...Upper level low over
the forecast area this evening will slowly drift into Utah by
morning. Trailing northwest flow will keep showers going in the
Magic Valley much of the night, but other areas should break up
and see some clearing. Snow level remains around 5500-6500 ft. 
Significant northwest winds this evening will start to diminish by
morning. Those winds may inhibit fog formation in some areas, but
believe there will be enough clearing that we added some areas of
patchy fog in the morning for all areas that received 
precipitation today. On Wednesday, a weak secondary wave dropping 
south, combined with moisture at the mid levels, will keep some 
showers possible over the Central Idaho Mountains through the 
afternoon, but should remain dry elsewhere. Northerly flow
continues through Thursday and Friday, which keep us from seeing
much warming, even though sunshine should be plentiful.
Temperatures remain 5-15 degrees below normal through Friday. 

.LONG TERM...Saturday through Tuesday...Upper level ridge to the 
west and upper level trough over the Rocky Mountains will keep cool 
northerly flow over the forecast area through Monday. Temperatures 
around 5-10 degrees below normal. Moisture associated with this 
system will generally stay in Montana on Sunday. Upper level ridging 
develops across the West next week with temperatures warming to near 
normal by midweek.
&&

.AVIATION...Widespread rain showers with IFR/MVFR ceilings will 
continue into the evening. Snow levels 5500-6500ft MSL. Showers will 
end by 03z tonight except in the Western Magic Valley which will 
continue through Wednesday morning. Fog/Stratus developing in 
sheltered valleys between 09z-16z Wednesday morning. Surface winds: 
Westerly 15-25kt, easing to NW 10-15kt after sunset. Gusts to 35kt
possible in SE Oregon through 01z. Winds aloft at 10kft MSL: W-NW
30-40kt easing to N-NE 15-25kt by 06z/Wed. 
&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.

&&

$$

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SHORT TERM...TB
LONG TERM....JS
AVIATION.....JS