FXUS65 KBOI 272104

AFDBOI



Area Forecast Discussion

National Weather Service Boise ID

304 PM MDT Mon Oct 27 2025



.SHORT TERM...Tonight through Wednesday night...Dry weather 

will prevail through the period as an upper ridge builds in from

the coast over the next day. Tonight is the coldest night ahead,

with a hard freeze possible across all zones. Recent 

precipitation will feed fog development in more sheltered mtn 

valleys, while an easterly wind across open terrain provides 

enough mixing to suppress fog/stratus development. Warming 

aloft will begin to build an inversion as mixing is limited by 

the late October sun angle. An upper trough riding through the 

ridge will increase clouds on Wednesday, but we remain dry as 

it's deflected to our north. Valley temperatures will be slower

to respond to the warming aloft and remain below normal through

Wednesday while mtn sites return to normal.



.LONG TERM...Thursday through Monday...Increasing cloud cover on 

Thursday as a deep Alaskan low kicks up an atmospheric river 

that will impact the PacNW and Canadian West Coast. Our forecast

area is spared most of the precipitation until Saturday night. 

We are currently forecasting a 20-40% chance of precipitation in

the north including Valley and Baker counties, though models 

disagree on where the narrow band of moisture will position 

itself. Amongst deterministic models, we range from dry in the 

GFS to steady rain showers in the Canadian. Precipitation may 

slowly move south Sunday. The weekend will also be breezy as the

pressure gradient tightens. A ridge builds back in to the are 

Sunday night. Temperatures will be seasonable for this time of 

year, although will lean above normal over the coming weekend.



&&



.AVIATION...Lingering MVFR In isolated snow showers in the  

mountains, with snow levels of 3.5-4.5 kft MSL through the day.  

Otherwise, VFR today with a few mid level clouds. Valley fog 

possible tomorrow morning in SE Oregon and W-Central Mtns in ID.

Surface winds: Variable 5-12 kt. Winds aloft at 10kft MSL: W-NW

10- 20 kt.



KBOI...VFR. Surface winds NW 5-10 kt today, becoming SE 4-8 kt 

tonight.



&&



.BOI WATCHES/WARNINGS/ADVISORIES...

ID...None.

OR...None.



&&



$$



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SHORT TERM...DG

LONG TERM....JM

AVIATION.....JM