784
FXUS65 KBOI 050248
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
848 PM MDT Sat Oct 4 2025

.DISCUSSION...Showers have decreased this evening as the upper
low progresses east through Wyoming. While breezy conditions
continue this eve, gusts should taper in the next few hours
before returning late Sunday morning and afternoon. Winds are
not anticipated to be as strong Sunday once distanced from the
low, but afternoon gusts to 20-30 mph will be frequent in the
Snake Plain and portions of east-central Oregon. Cold
temperatures and calming conditions tonight will allow for
localized frost/shallow fog in valley locations where winds
stay light and skies clear. In addition to wind gusts,
rain/snow showers will return over the central Idaho terrain and
the Magic Valley Sunday due to continuing unstable conditions,
though insufficient moisture and dynamics will keep showers weak
and isolated. Snow levels will stay at approximately 6500-7000
feet MSL.

&&

.AVIATION...Mostly VFR. Low cloud ceilings and patchy valley fog
with MVFR/IFR conditions will develop overnight near KBKE and
KJER/KTWF. Isolated showers will occur overnight across high terrain
and Magic Valley. Snow levels 7000 ft MSL dropping to 6500 ft MSL
tonight. Mtns obscured in low ceilings and precip. Surface winds: W-
NW 10-20 kt gusting up to 30 kt this evening, with localized gusts
up to 40 kt in the Snake Plain. Winds calm to N-NW 5-15 kt
later tonight after 06z. Winds aloft at 10 kft MSL: N-NW 20-30 kt.

KBOI...VFR. Partly cloudy this evening with a few low clouds near
the foothills overnight. Surface winds: NW 10-15 kt, decreasing
to W-NW 5-7 kt after 04Z.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Monday night...An upper level
trough will move to the East tonight, bringing lingering
showers over high terrain in the Central Mountains and the Magic
Valley through Sunday. Snow levels will drop to 6500 feet, with
minimal accumulations anticipated. Gusty winds across the
region will stay elevated through the evening, tapering off
after sunset. Cool northerly flow will continue tomorrow,
keeping temperatures about 5-10 degrees below normal.
Temperatures will dip in to the mid to upper 30s overnight on
Sunday into Monday, allowing for frosts in higher elevation
valleys. Conditions will dry out by Sunday afternoon, with an
upper level ridge beginning to build into the northwest on
Monday night. Patchy valley fog will occur overnight as well,
primarily in sheltered mountain valleys, with low stratus
forming in the Lower Snake River Valley likely by Monday
morning.

LONG TERM...Tuesday through Saturday...The ridge of high
pressure will build into the region through the middle of the
week, with a warming and drying trend through Wednesday.
Temperatures will return to seasonal normals by Wednesday, with
a deepening trough moving inland elevating chances of
precipitation over Baker County and the West Central Mountains
by the evening. Uncertainty remains with significant model
disagreement on the path of a deep upper level low. Most
guidance brings precipitation with cooler temperatures into the
region by Saturday. If the low deepens considerably over our
region by the end of the week, snow levels will drop to nearly
5000 feet, bringing chances of snow to higher elevation valleys.


&&

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

&&

$$

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DISCUSSION...SH
AVIATION.....JY
SHORT TERM...SA
LONG TERM....SA