Scattered showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Partly cloudy, with a low around 34. North northwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 30%.
Forecast discussion
098
FXUS65 KBOI 222029
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
229 PM MDT Thu May 22 2025
.SHORT TERM...Tonight through Saturday night...Afternoon showers
and thunderstorms over e-central Oregon and w-central Idaho will
diminish this evening. Outflow wind gust threat is 40 MPH for
the remainder of today. Gusty large-scale winds will continue to
gust 30-40 mph across s-central Idaho zones early this evening,
tapering off towards sunset. Tonight is dry as the first of two
shortwave troughs lifts into MT. The second trough will enter
the region on Friday elongating as it moves through the
Intermountain West. Elevated terrain will see a 20-40% chance of
afternoon showers and thunderstorms Friday. The outflow wind
potential from showers/storms on Friday will again reach 40
MPH. The Snake Plain will remain dry as conditions remain too
stable for development. Memorial Day Weekend will start off dry
as an upper ridge builds along the Cascades on Saturday. High
temperatures will warm 3-8 degrees from Friday to Saturday with
lower elevations closing in on 80F and mtn valleys nearing 70F,
or about 5 degrees above normal.
.LONG TERM...Sunday through Thursday...A narrow, amplified ridge
will move overhead on Sunday, boosting temperatures to 10-15
degrees above normal with dry, calmer conditions. A weakening
Pacific trough will approach late Sunday and increase the chance
for showers and thunderstorms by Monday afternoon, but
temperatures will only lower by a few degrees as the trough
moves overhead. The trough will continue east on Tuesday, and a
chance of showers/thunderstorms will remain over central Idaho
on the backside of the trough. Models fall out of agreement on
timing and evolution, however, so forecast confidence for
temperatures and storms remains somewhat low. High pressure will
begin to build for mid-week, though lingering mid- level
moisture and increased daytime instability should re-introduce
showers and thunderstorms over the higher terrain. Currently,
Wednesday is forecast to be the hottest day of the week before
the next Pacific trough arrives Thursday.
&&
.AVIATION...Generally VFR. Isolated showers and thunderstorms
this afternoon, ending by sunset. Localized MVFR/obscuration
in mountains. Gusts up to 35 kt with storm outflows. Surface
winds: W to N 5-15 kt with gusts to 20-25 kt, except 15-25 kt
with gusts to 30-35 kt for MUO-KGNG-KJER area. Winds aloft at
10kft MSL: W 10-25 kt.
KBOI...VFR. A 20% chance of thunderstorms hitting the terminal
this afternoon. Erratic outflow gusts to 25-35 kt with storms.
Winds outside of storms: NW-N 10-15 kt, gusts to 15-25 kt.
Weekend Outlook...Generally VFR. Isolated showers and
thunderstorms Friday afternoon, with outflow gusts to 25-35
kt. Mountain obscuration in precip. VFR and mostly clear
Sat/Sun. Winds: W to NW 5-15 kt with 20-25 kt gusts on Fri/Sat,
then generally E to S 5-10 kt Sun.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.
&&
$$
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SHORT TERM...DG
LONG TERM....SH
AVIATION.....SH
Nearest avalanche forecast regions
PAC Advisory Area
31mi away by Payette Avalanche Center
No Rating - Watch for signs of unstable snow such as recent avalanches, cracking in the snow, and audible collapsing. Avoid traveling on or under similar slopes.
Banner Summit
64mi away by Sawtooth Avalanche Center
No Rating - Watch for signs of unstable snow such as recent avalanches, cracking in the snow, and audible collapsing. Avoid traveling on or under similar slopes.
Southern Wallowas
64mi away by Wallowa Avalanche Center
No data reported
Northern Wallowas
69mi away by Wallowa Avalanche Center
No data reported
Sawtooth & Western Smoky Mtns
92mi away by Sawtooth Avalanche Center
No Rating - Watch for signs of unstable snow such as recent avalanches, cracking in the snow, and audible collapsing. Avoid traveling on or under similar slopes.
Blues
102mi away by Wallowa Avalanche Center
No data reported
Elkhorns
104mi away by Wallowa Avalanche Center
No data reported
Bitterroot
105mi away by West Central Montana Avalanche Center
No data reported
Galena Summit & Eastern Mtns
111mi away by Sawtooth Avalanche Center
No Rating - Watch for signs of unstable snow such as recent avalanches, cracking in the snow, and audible collapsing. Avoid traveling on or under similar slopes.
Soldier & Wood River Valley Mtns
131mi away by Sawtooth Avalanche Center
No Rating - Watch for signs of unstable snow such as recent avalanches, cracking in the snow, and audible collapsing. Avoid traveling on or under similar slopes.
