Fields, Oregon Weather Forecast Discussion

177
FXUS65 KBOI 260838
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
238 AM MDT Fri Sep 26 2025
.SHORT TERM...Today through Sunday night...On the backside of a
dry cold front that is passing through this morning, gusts up to
30-40 mph along ridges and in channeled valleys have been
observed, along with a steep drop in dewpoint (nearly 30
degrees). Post-frontal gusts continue through the day,
especially in the Snake Plain and highlands, and high temps will
be lower than previous days (mid 70s for lower elevations, mid
60s for higher elevations).
High pressure builds back into the region Friday night through
Sunday afternoon, leading to warming that takes us back up to 10
degrees above normal and clear skies with lighter winds.
However, a significant change in weather arrive Sunday evening
as a deep Alaskan low moves southward along the Canadian west
coast. Late Sunday will see increasing clouds and a 15-25%
chance of precipitation in SE Oregon and SW Idaho. This precip,
potentially enhanced by a shortwave and warm surface
temperatures, has a 10% chance of embedded thunderstorms. The
core of the low and cold frontal passage arrive in the long
term.
.LONG TERM...Monday through Friday...Guidance continues to remain on
track with a significant weather maker early to mid next week. This
change will arrive in the form of a deep pacific trough of low
pressure, beginning late Monday and lingering into Wednesday. This
trough is expected to bring much lower temperatures and the chance
of significant precipitation to the region. Current model and
forecast predictions highlight over an inch of water accumulation
over the terrain of central Idaho and anywhere from 0.25 to 0.75
inches for valley locations. Guidance suggests a 45% chance of an
inch or more of precipitation by mid day Wednesday over the
mountains. Snow levels are expected to be above 8000 feet.
Uncertainty exists mainly in the amount of precipitation to expect
in lower valley locations. This is due to the persistent southwest
flow anticipated with the trough, which may lead to significant
shadowing across the valleys of SE Oregon and SW Idaho. The mountain
precipitation, especially across central Idaho looks more likely.
Temperatures of 5 to 10 degrees below normal will accompany the
trough, with near normal temperatures and dry conditions returning
by late week as a low amplitude ridge builds over the region in the
wake of the trough.
&&
.AVIATION...VFR, with gusty northwest winds in the wake of a cold
front, especially along the front this AM, and across south-central
Idaho this afternoon. Some pockets of blowing dust could be
possible. Winds favoring a WNW direction amount 10 kt for most
areas, becoming WNW 10-20 kt with higher gusts this afternoon.
.KBOI...VFR with gusty NW winds of 10-20 kt after 17Z. Returning to
more diurnal winds after sunset.
.Weekend Outlook...VFR with gradually increasing WSW flow aloft as a
trough approaches the region Sunday afternoon. Surface winds will be
diurnally driven Saturday, becoming ESE area-wide and increasing as
the trough approaches.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.
&&
$$
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SHORT TERM...JM
LONG TERM....MC
AVIATION.....MC

NWS BOI Office Area Forecast Discussion