Deep Creek, Idaho Weather Forecast Discussion

273
FXUS65 KBOI 250237
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
837 PM MDT Wed Sep 24 2025
.DISCUSSION...The upper-level ridge will maintain clear skies
and above-normal temperatures into Thursday, ahead of the next
upper-level trough. Cooler temperatures are expected overnight,
especially in the mountain valleys. Thursday is forecast to be
the warmest day of the week, with highs in the mid to upper 80s
across the lower valleys.
A dry cold front, driven by a stalled upper low and a trough
axis over the Pacific Northwest, will move through the area late
Thursday into Friday morning. This will drop temperatures, with
highs reaching the upper 70s for lower elevations and upper 60s
for higher elevations. Gusts up to 25 mph are also expected
Friday morning through the afternoon, though conditions will
remain dry with a brief increase in cloud cover ahead of the
front.
Some smoke from nearby fires may create hazy surface conditions,
mainly in west central mountains of Idaho. No updates needed at
this time.
&&
.AVIATION...VFR with clear skies. Surface winds: Variable up to 10
kt. Winds aloft at 10kft MSL: Variable 5-10 kt.
KBOI...VFR with clear skies. Surface winds: light out of the N-NW
this evening, becoming SE under 10 kt by Thu/06z.
&&
.PREV DISCUSSION...
SHORT TERM...Tonight through Friday night...Persistence through
Thursday under high pressure aloft. Upper low in Calif will make
a brief turn northward tonight then southward again Thursday
with no effect on our wx. Changes begin Thursday night when a
Gulf of Alaska upper trough moves onto the northwest coast and
pushes a dry surface cold front through our CWA early Friday
morning. Increased mixing at low levels will slightly moderate
(i.e., raise) low temps in the normally colder valleys Friday
morning. Post-frontal west winds will bring cooler air Friday
with high temps 8 to 10 degrees lower than Thursday. The upper
trough and cooler air mass will already be on their way out by
Saturday morning.
LONG TERM...Saturday through Wednesday...The closed upper low
in southern CA/NV is expected to stall behind a broad ridge
over the upper Great Basin and southern ID/OR through Saturday.
This ridging will continue slightly warmer than normal
temperatures for the area on Saturday and Sunday, with valleys
seeing peak temperatures in the lower 80s for both days.
Through Sunday, this upper low is expected to trek NE`ward as
a longwave trough and steer some remnant monsoon moisture into
the area, bringing a 10-15% chance of showers Sunday afternoon/
evening and a cooling trend throughout next week. Monday
through Wednesday will see a strong and large upper low off the
Gulf of Alaska steer into the Pacific NW region, bringing rounds
of showers and thunderstorms throughout the area early next
week until Wednesday. As of now, guidances indicate the higher
chances of thunderstorms on Monday and Tuesday, mainly for
higher elevations.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.
&&
$$
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DISCUSSION...JDS
AVIATION.....NF
SHORT TERM...LC
LONG TERM....JY

NWS BOI Office Area Forecast Discussion