518
FXUS65 KBOI 041050
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
350 AM MST Tue Nov 4 2025

.SHORT TERM...Today through Thursday night...Showers this
morning are accompanying the passage of an upper trough and
weak front. Showers will linger in the Boise Mountains through
late morning as the front stalls. By late afternoon increasing
southerly flow aloft will push the front northward bringing
a chance of light precipitation. The Snake Plain could see some
light showers from this, but focus of precipitation will be
across SE Oregon.

A deeper upper trough pushes onto the coast tonight and will
move across the region on Wednesday. Winds will become gusty out
ahead of the system, especially across SE Oregon and higher
terrain of SW Idaho. Southern Harney and Malheur counties are
borderline for Wind Advisory where sustained winds of 20 to 30
mph and local gusts of 40 to 50 mph are possible through the
afternoon. This will mainly be an orographic event as mountains
see widespread precipitation develop by Wednesday afternoon,
carrying through Wed night. Snow levels will start between
7-8kft MSL, lowering to 6-7kft MSL Thursday morning as the
heavier precipitation shuts off. Snow accumulation will be
limited to elevations above 6500 feet where a general 1 to 3
inches is expected with up to 6 inches across higher peaks. The
best chance for light rain across lower elevations will come
with the upper trough passage late Wed/Wed night. Liquid totals
for Wed/Wed night will range from less than 0.10" in the valleys
to a broad 0.25-0.5" in mtn valleys and up to 0.75" across
higher peaks. Light showers continue in the mountains on
Thursday as the storm exits eastward. Another upper wave will
push into the Pac NW Thursday night. Snow levels will range
from around 6500ft MSL to the north to 8kft MSL along the
northern NV border Thursday night.

.LONG TERM...Friday through Tuesday...The next Pacific trough
will arrive early Friday, associated with strong west-
northwest unidirectional flow and ample moisture. Precipitation
will spread into the area, favoring upslope areas such as the
mountains of west- central/central Idaho. Many valley locations
will have reduced precip totals from shadowing effects due to
the strong mid-level flow. This trough will be quick-hitting,
but is expected to produce additional inches of snow above 6k-7k
feet MSL for the mountains in west-central/central Idaho and
northeast Oregon. High temperatures will lower by a couple of
degrees compared to Thursday, but should remain near normal for
this time of year. In addition, surface winds will become gusty,
especially Friday afternoon on the backside of the cold front.
Cool, northwest flow will develop behind the trough Saturday
morning while an upper level ridge amplifies over the West. The
ridge will continue to build over the area this weekend, with
drying conditions expected Saturday through mid-Monday apart
from patchy morning fog. Temperatures will also trend warmer for
Sunday and Monday, reaching 5 degrees above normal both days.
Beginning mid- day Monday into Tuesday, models fall out of
agreement with the evolution of the ridge and an approaching
shortwave trough. Current forecast trend remains mostly dry and
mild for Tuesday.

&&

.AVIATION...Precip in southeast OR and southwest/central ID this
AM. Then, afternoon warm front moving S to N will bring
widespread precip thru late eve. Periods of MVFR-LIFR for mtns
in precip/low clouds. Brief MVFR possible in valley rain. Mtns
obscured. Snow levels 6.5k-8.5k feet MSL, lowest to the NW.
Surface winds: SW-SE 5- 15 kt. Gusts increasing to 25-40 kt in
SE Oregon, near ID/NV border, and portions of Treasure Valley
tonight. Winds aloft at 10kft MSL: W- SW 20-40 kt. LLWS possible
tonight.

KBOI...VFR. Surface winds: SE 5-12 kt. Periods of light rain
today, ending around 05/03z. Less than 10% chance of MVFR.

&&


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

&&

$$

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SHORT TERM...DG
LONG TERM....SH
AVIATION.....SH