839
FXUS65 KBOI 091158
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
558 AM MDT Mon Mar 9 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Cooler temperatures and breezy conditions across the Snake
  River Plain Today through Wednesday.

- Gusty winds Thursday through Monday, with precipitation
  chances favoring the northern areas each day.

&&

.SHORT TERM /Through Wednesday Night/...
Issued 255 AM MDT MON MAR 9 2026
A Pacific cold front is currently working its way through the
forecast area this morning from north to south. There has been
little precipitation associated with the front this morning
though a few showers are possible across the central Idaho
mountains. Skies will clear from west to east through the day,
but a tightened pressure gradient will keep conditions breezy
across the Snake River Plain. Highest winds look to be across
the Camas Prairie with gusts up to 45 MPH possible. High
temperatures today will be 10 to 15 degrees cooler than
yesterday.

Northwest flow continues across the region Tuesday through
Wednesday with embedded shortwaves moving west to east across
Washington, northern Idaho, and Montana. At best, this could
bring (25% chance) light showers to the west central mountains
Tuesday and Wednesday. This will, however, continue breezy
conditions across the area especially for the Snake River Plain
and Camas Prairie Tuesday and Wednesday afternoons. Wind speeds
look to remain just below wind advisory criteria with only 15%
chance of exceeding 50 MPH gusts.

&&

.LONG TERM /Thursday through Monday/...
Issued 255 AM MDT MON MAR 9 2026
Zonal mid-level flow will strengthen on Thursday in between a
cold Canadian trough and a warm Southwest U.S. ridge. Surface
wind gusts will intensify across SE Oregon and SW Idaho
Thursday, driven by a tight surface pressure gradient and
reinforced by daytime vertical mixing. These gusty winds will
continue Friday and into the weekend, but the strongest gusts
are expected Thursday and Saturday. Initially, precipitation
chances will remain focused across the northern zones Thursday
and Friday, with prominent upslope impacting the west-central
Idaho terrain. Then, the upper flow will gradually transition to
northwesterly on Saturday as a ridge amplifies along the West
Coast, broadening the precip chances across the remainder of
southwest Idaho and portions of east-central Oregon. Snow levels
will range between 6000-7500 feet MSL but could briefly dip
lower on Saturday across the north. Onshore Pacific flow will
effectively shield the area from the colder Canadian airmass,
and therefore temperatures should remain 5-15 degrees above
normal throughout this period. Thereafter, the upper ridge will
continue to build into the western U.S. Sunday/Monday, shifting
the storm track north and decreasing precipitation chances for
the southern areas. Despite the shift, surface winds will remain
breezy for both Sunday and Monday, and temperatures will stay
above normal.

&&

.AVIATION /12Z Monday through Tuesday/...
Issued 558 AM MDT MON MAR 9 2026

Generally VFR. Patchy MVFR stratus through morning. Virga/light
showers around KBKE-KMYL area, with some mtn obscuration. Snow
levels approx 4-6kft MSL...lowering to valley floors for north
by late morning, remaining 4-6kft MSL for south. Surface winds:
SW-NW 5-15 kt, increasing to W-NW 10-25 kt with gusts to 20-35
kt late AM through afternoon. Winds aloft at 10kft MSL: W 30-45
kt.

KBOI...VFR, less than a 10% chance of light rain this morning.
Surface winds: variable or WNW 4-8 kt, becoming NW 10-18 kt
with gusts 20-30 kt after Mon/17Z.

&&

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

OR...None.

&&

$$

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AVIATION.....SH
SHORT TERM...JDS
LONG TERM....SH