Weather Service Report


398 
FXUS65 KBOI 192030
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
230 PM MDT Thu Oct 19 2017

.SHORT TERM...Tonight through Saturday...Satellite data continues
to show increasing cloud cover across the Pacific Northwest this 
afternoon, with observations noting hints of the cold front moving
off the Pacific coastline. Gusty winds noted across Oregon and 
portions of central Idaho this afternoon ahead of this 
anticipated front. Models continue to indicate this front arriving
into eastern Oregon late tonight and moving into southwest Idaho 
early Friday morning. As the front progresses, expect the threat 
for gusty wind to continue, with precipitation expected to 
accompany the front. Snow levels will decrease to around 6k ft 
tonight, leaving mountain snowfall possible. Temperatures on 
Friday are expected to be between 10 and 20 degrees cooler than 
today. Shower activity will weaken through the evening hours as 
the front moves east of the area. However, another push of 
moisture will move into eastern Oregon late Friday night, 
spreading across Idaho on Saturday afternoon and evening. This 
will continue to wet and cool pattern, with temperatures remaining
generally 5 to 10 degrees below normal. 


.LONG TERM...Saturday night through Thursday...Moist westerly flow 
aloft will continue to support showers, mainly over the mountains of 
Baker County Oregon and west central Idaho, through Sunday night. An 
upper level ridge building over the west coast will cut off the 
moisture supply on Monday. Tuesday night an upper level trough from 
the Gulf of Alaska will weaken as it moves into British Columbia and 
encounters the ridge. The trough will slide southeast across 
northern Idaho and western Montana Wednesday afternoon and evening 
as the ridge rebuilds offshore. Precipitation with this system is 
expected to stay north and east of our area, and there will be 
little effect on temperatures, which will continue near or slightly 
above normal.

&&

.AVIATION...VFR through this evening. Increasing and lowering  
clouds tonight ahead of a Pacific cold front, currently timed to 
pass KBKE and KBNO about 09z, KMYL and KBOI about 12z, and KTWF and 
KJER about 15z Friday. Expect deteriorating conditions after 06z, 
with showers spreading across the area, and areas of mountain 
obscuration and MVFR ceilings. Snow levels lowering from 7000-8000 
feet MSL tonight to 5000-6000 feet MSL Friday morning and around 
5000 feet MSL Friday afternoon. Surface winds mainly east to 
southwest 10-20 kts, shifting to west 10-20 kts following the front. 
Winds aloft at 10kft MSL southwest 30-40 kts.

&&

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

&&

$$

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SHORT TERM...KB
LONG TERM....JT/JT
AVIATION.....JT

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Western Regional Climate Center, wrcc@dri.edu