628
FXUS65 KBOI 101644
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
944 AM MST Mon Nov 10 2025

.DISCUSSION...Mild and dry conditions are expected today with
high level clouds across the area as a weak upper level trough
moves across the Idaho Panhandle. This trough should weaken the
upper level ridge significantly enough by this evening to scour
out much of the valley inversion that has been in place over
the weekend. Until then, today`s highs will be around 10 degrees
above normal, especially in the mountains. The inversion will
hold highs near normal across the lowest elevations, where
temperatures will be slightly lower but still above normal. The
ridge rebuilds northward again on Tuesday, with the axis
positioned east of the area, allowing for increased
southwesterly flow and warming aloft. No update needed at this
time.

&&

.AVIATION...VFR under high clouds. Patchy valley fog overnight
Monday into Tuesday morning. Surface winds: less than 10 kt.
Winds at 10kft MSL: W-SW 15-25 kt.

KBOI...VFR. Surface winds less than 10 kt.

&&

.AIR STAGNATION...A temperature inversion will keep mixing
heights below 2kft today for the lower valleys. In addition to
light surface winds, this will bring another day of stagnant
conditions. Tuesday will see some improvement in the wake of a
passing upper trough that cools temperatures aloft. Wednesday
will add stronger surface winds and Thursday will see
improvement across all zones with the arrival of a cold front
bringing breezy winds and valley rain.

&&

.PREV DISCUSSION...
SHORT TERM...Today through Wednesday night...An upper wave
moving onto the BC coast this morning will track along the
US/Canada border, suppressing the ridge currently over the
Intermountain NW. While it won`t bring precipitation to our area
it will weaken the temperature inversion on Tuesday resulting
in some extra warming at lower elevations and cooling in the
mtns. Wednesday will see an increase in southwest flow aloft as
a deeper trough approaches the West Coast. Surface winds will
pickup in response which should improve mixing. Wednesday will
be the warmest day for most locations as highs reach 10-15
degrees above normal, though we will see periods of high clouds
through the day. A 15-30% chance of showers creeps into SE
Oregon and the w-central Idaho mtns Wednesday night as the
trough pushes onshore. Snow levels are 8-9kft MSL as the
precipitation gets started.

LONG TERM...Thursday through Monday...Thursday will kick off a
period of active weather that continues through into next week.
The initial trough will track across the region bringing 60%+
precipitation chances to most sites through Friday morning.
Lower elevations see up to 0.20" with 0.25-0.50" amounts in the
mtns. Snow levels will steadily drop to between 4500-6000 feet
MSL (west to east respectively) allowing for accumulations of 2
to 5 inches above 6000 feet MSL. The weekend is looking cool
and unsettled as upstream troughing moves through region. Timing
of these systems remains uncertain, but generally valleys will
maintain a 20-40% chance of rain while mtns hold onto a 40-60%
chance of rain/snow through Monday. Snow levels Friday night/Sat
drop to between 4-5kft MSL and minor accumulations (up to 2")
are possible down to mtn valley floors. Friday and Saturday are
the coolest days with highs near normal.

&&

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

&&

$$

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DISCUSSION...JDS
AVIATION.....CH
AIR STAGNATION...JDS
SHORT TERM.......DG
LONG TERM........DG