930
FXUS65 KBOI 031556
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
956 AM MDT Thu Apr 3 2025

.DISCUSSION...Scattered clouds with a localized stratus deck
over the Magic Valley will slowly erode this morning, with
cumulus cloud development anticipated later this afternoon.
Cooler temperatures with afternoon rain and snow showers will
continue thanks to the upper level low hanging out over the
region. A low chance of thunder (<10%) will accompany showers in
the Central ID Mountains, mainly during the early evening
hours. Showers will be focused on higher terrain, with snow
levels around 3500-4500 feet. A warming and drying trend will
commence tomorrow through the weekend, with temperatures about
5-10 degrees above normal by Sunday. No forecast updates
necessary.

&&

.AVIATION...Mainly VFR. Local IFR and mtn obscuration through 18Z
due to low clouds. Scattered showers and isolated thunderstorms will
develop this afternoon mostly over higher terrain. Showers/storms
could produce outflow winds to 25 kt. Snow levels 3500-4500 ft MSL.
Surface winds: W-NW 5-15 kt with gusts to 25 kt. Winds aloft at
10kft: N-NW 10-20 kt.

KBOI...VFR with NW winds today. Scattered showers this afternoon
along Boise foothills will obscure mountains at times.

Weekend Outlook...Local MVFR/IFR in mtn valleys due to fog Friday
morning, with cumulus buildups in the afternoon. Otherwise VFR
through Sun under mostly clear skies. Surface winds: Generally less
than 12 kt.

&&

.PREV DISCUSSION...
SHORT TERM...Today through Saturday night...Main upper trough
is still over the interior western US this morning but gradually
filling. After patchy morning valley fog, one last weak short
wave trough, over southern BC at 2 AM MDT, will enter the main
trough later today and produce scattered afternoon snow showers
in the Idaho mountains. This trough will also provide enough
cooling aloft for isolated thunderstorms this afternoon in
mountains on the Idaho side. Then clearing and cold tonight
under northerly flow aloft. A warming trend will begin Friday as
the main trough shifts eastward to the Rocky Mountains and our
area comes under the influence of a high amplitude upper ridge
off the west coast. The ridge will come inland Saturday and
Sunday bringing even warmer days along with mostly clear skies,
although nights will stay relatively cold. Northwest winds
today and Friday, generally 5 to 15 mph during the nights and
mornings, then 10 to 20 mph with afternoon gusts to 30 mph in
the central Snake Basin southward to the Nevada border.

LONG TERM...Sunday through Thursday...An amplified ridge will
continue Sunday, supporting relatively warm temperatures and dry
conditions for one more day. A shortwave trough will approach
eastern Oregon and southwest Idaho late Sunday, consequently
generating shower activity by Monday. Showers are more likely
to occur across northeast Oregon and west-central Idaho (50-70%
chance), with lower chances (25-40%) farther south near the NV
border. As the precip and cold front move through the area
Monday, snow levels will lower to 6000-7000 feet MSL. Snow
amounts should remain relatively minor due to the quick
progression of this trough, but surface winds could become
breezy. A much weaker shortwave will follow on Tuesday with
current model guidance keeping the moisture limited to the
northern areas. Tuesday snow levels are expected to lower
further to around 5000-6000 feet. Beyond Tuesday, dry, high
pressure will rebound across the western U.S. and warm
temperatures to approximately 10-15 degrees above normal by
Thursday.

&&

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

&&

$$

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