292
FXUS65 KBOI 171651
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
951 AM MST Mon Nov 17 2025

.DISCUSSION...Light rain showers will continue to taper off
throughout the day, as another day of above normal temperatures
continues with highs in the Treasure Valley reaching near 60F.
Low level stratus clouds with widespread overcast skies will
continue overnight, with low confidence in high terrain showers
tomorrow. Patchy fog will form tonight over most valleys, with
moderate confidence that we will see dense fog near
Caldwell/Ontario and in mountain valleys tomorrow morning.
Conditions will dry and clear out over most of the region
tomorrow ahead of a weak cold front passage on Wednesday. Snow
levels remain around 7500-8500 feet MSL today, lowering to
5000-6000 feet MSL by Wednesday. No updates necessary to the
forecast.

&&

.AVIATION...Low VFR/MVFR to IFR conditions this morning with
scattered rain showers, improving this afternoon. Mountains
obscured. Decreasing clouds tonight and light winds will allow areas
of LIFR fog to develop. Surface winds variable 10kt or less. Winds
aloft at 10kft MSL: S-SW 5-15kt.

KBOI...Low VFR this morning with scattered showers, decreasing by
early afternoon. Ceilings gradually lifting this afternoon with
clearing late. Around a 20% chance of LIFR low clouds/fog
developing Tuesday AM. Surface winds variable 10kt or less.


&&

.PREV DISCUSSION...
SHORT TERM...Today through Wednesday night...A band of
precipitation remains over the area this morning and is slowly
weakening. Precipitation will taper off by this afternoon, with
mostly cloudy skies. Upper level ridging reforms over the area
later today as another cutoff low develops off the CA coast.
Temperatures will be around 10 degrees above normal today and
Tuesday, and could overachieve again like the past few days.
Patchy fog expected tonight and on Wednesday morning. Of note,
NAM 3km has extensive fog and low clouds on Wednesday morning.
A weak cold front will move across northern ID on Wednesday
with a slight chance of showers over the west central ID
mountains. Slightly cooler temperatures expected on Wednesday,
but still around 5 degrees above normal.

LONG TERM...Thursday through Monday...Upper level ridging
returns on Thursday as another system moves south along the West
Coast into another cutoff low off the CA coast. With the
low sun angles and recent moisture, patchy fog and low stratus
is possible in the valleys. A temperature inversion strengthens
on Friday and lasts through at least Monday. Forecast
temperature confidence is low in the extended and depends on the
coverage of low clouds and fog.

&&

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

&&

$$

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DISCUSSION...SA
AVIATION.....ST
SHORT TERM...KA
LONG TERM....KA