Granite, Oregon Weather Forecast Discussion

012
FXUS65 KBOI 130253
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
853 PM MDT Fri Sep 12 2025
.DISCUSSION...Any lingering isolated showers over SE Oregon
will dissipate over the next couple of hours. Clearing skies
will set up a cool overnight lows and expect fog to form,
especially in sheltered mountain valleys that have seen recent
rainfall. Looking at a mild day tomorrow with a few showers and
thunderstorms possible over the w-central Idaho mtns east of
McCall and Lowman. A higher chance of showers and thunderstorms
is expected on Sunday as another trough approaches the region.
The current forecast is on track.
&&
.AVIATION...Isolated showers and thunderstorms will taper off
this evening with mostly clear skies overnight. Patchy fog
overnight in mountain valleys, including near KMYL/KBKE/KBNO.
Isolated showers and thunderstorms redeveloping over the central
ID mountains Saturday afternoon. Surface winds: variable less
than 10 kt, becoming W-NW 5-15 kt Saturday afternoon. Winds
aloft at 10kft MSL:
NW 5-15 kt.
KBOI...VFR. Light SE winds overnight, becoming NW 5-10 kt
Saturday afternoon.
Sunday Outlook...A trough and cold front will bring scattered
showers and thunderstorms to the area in the afternoon and
evening. Storms may bring MVFR/IFR conditions, mountain
obscuration, gusty outflow winds up to 45 kt, small hail, and
heavy rain. Surface winds SE-SW 5-15 kt in the morning, becoming
W-NW 10-20 kt in the afternoon and evening behind the cold
front.
&&
.PREV DISCUSSION...
SHORT TERM...Tonight through Sunday night...An upper level
trough continues to weaken as it moves eastward today. Isolated
showers and thunderstorms will generally be anchored over the
higher terrain through this evening, due to weak steering flow
aloft. Showers and thunderstorms will dissipate after sunset
with the loss of daytime heating. Good radiational cooling
expected tonight with patchy fog on Saturday morning. Saturday
will be mostly sunny in the afternoon between systems, with
temperatures near normal. A potent trough moves over the area
on Sunday afternoon, with showers likely north of Burns to
McCall with scattered thunderstorms areawide. Gusty outflow
winds up to 45kt possible Sunday afternoon and evening with the
storms and cold front. Heavy rain also a threat with the storms
as precipitable water values will be in the 80-85th percentile.
Some of the CAMs models are showing a quick 0.50 to 1.50 inch
of precipitation with the storms. Flash flooding threat around
burn scars will need to be monitored. Monday will cool to around
10 degrees below normal.
LONG TERM...Monday through Friday...A ridge will build into the
area on Tuesday with mostly sunny skies and temperatures
returning to near normal Tuesday and 5 degrees above normal on
Wednesday. After Wednesday forecast confidence is low as the
model solutions diverge significantly.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.
&&
$$
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DISCUSSION...DG
AVIATION.....ST
SHORT TERM...KA
LONG TERM....KA

NWS BOI Office Area Forecast Discussion