262
FXUS65 KBOI 301002
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
302 AM MST Sun Nov 30 2025

.SHORT TERM...Today through Tuesday night...Light snow has come
into our CWA about as forecast. Beginning late Saturday evening
the main snow band extended from Baker County through eastern
Malheur County into the Lower Treasure Valley and Owyhee
Mountains. Those areas should receive 1 to 3 inches total
snowfall overnight, ending before sunrise. Elsewhere less than
one inch is expected.  At 2 AM MST radar imagery suggested
shadowing in the Upper Treasure Valley, with webcams showing
snow and wet roads in Nampa but little or none in Ada County.
Latest hi-res models and hourly NBM MOS indicate 3 to 5 AM as
the main time frame for snow in the Boise metro. Air temps in
the Lower Treasure Valley have been 32 to 35 degrees with
roads appearing only wet, so little if any impact on travel
is expected. By sunrise the main snow will be in Owyhee and
Twin Falls Counties with an inch accumulation likely in the
valleys and 2 to 4 inches on the higher terrain along the
ID/NV border, generally ending by noon. Skies will be clearing
elsewhere from the northwest, and this afternoon should be
sunny and melt all the snow at low elevations. Clear skies and
lingering low-level moisture due to the melted snow will favor
fog formation in the valleys overnight and Monday morning.
Otherwise, skies should be mostly clear through Monday.
Clouds will increase from the north Monday night ahead of the
next upper trough from western Canada. That trough is forecast
to bring more snow and low-valley rain Tuesday and Tuesday
night mainly on the Idaho side.


.LONG TERM...Wednesday through Sunday...An upper level ridge
centered off the coast will keep northerly flow aloft across
our area Wednesday and Thursday. As a result, temperatures will
remain near normal with dry conditions. A pattern change is
possible as early as Thursday night/Friday, but more likely
over the weekend as the ridge weakens. This would allow Pacific
moisture to move into the area under nearly zonal flow aloft.
Precipitation chances on Friday are around 10-20% in the valleys
and 30-60% in the mountains, and increase 10-20% over the
weekend. The air mass under westerly flow will be fairly mild
with snow levels around 4000-6500 feet, fluctuating with the
passage of embedded shortwave troughs. Temperatures are expected
to average several degrees above normal. Lower valleys will see
precipitation fall as rain, with rain and snow in the mountains.
There is potential for significant snow accumulations on the
higher peaks. Uncertainty is still high on timing/strength of
individual systems as deterministic and ensemble models depict
significant variability. However, recent model trends are
promising for a wetter pattern to develop by next weekend.

&&

.AVIATION...Snow decreasing N to S this morning, ending by
Sun/18Z along the Nevada border. Snow levels at/near valley
floors, with snow mixing with rain in lowest valleys including
near KONO. MVFR to LIFR in precip. Mtns obscured. Improving
conditions this afternoon, except local MVFR/IFR stratus
lingering in the Magic Valley and near the Nevada border.
Surface winds: N-NW 5-15 kt, with areas of 20-30 kt gusts
through the Snake Basin. Winds aloft at 10kft MSL: NW-NE
15-30 kt.

KBOI...Light snow early this morning, ending by Sun/13Z.
Less than a half inch of snow is expected, with most of the
accumulation limited to colder surfaces. MVFR-IFR in snow
and foothills obscured. Surface winds: NW 5-10 kt this
morning, increasing to 10-15 kt with gusts to around 20 kt
this afternoon.

&&

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

&&

$$

www.weather.gov/Boise

Interact with us via social media:
www.facebook.com/NWSBoise
www.x.com/NWSBoise

SHORT TERM...LC
LONG TERM....ST
AVIATION.....ST