Halfway, Oregon Weather Forecast Discussion

442
FXUS65 KBOI 170307
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
907 PM MDT Tue Sep 16 2025
.DISCUSSION...
Satellite imagery from this evening shows a nearly cloudless
sky across southwest Idaho and southeast Oregon, with any
convective clouds confined to the Sawooth Mountains. Northeast
flow aloft is spreading a thin layer of Canadian smoke into the
area. Enough residual moisture may be in place to support
localized pockets of fog Wednesday morning in high elevation
mountain valleys.
&&
.AVIATION...
VFR. Layers of smoke aloft. Local IFR in mtn valley fog
17/06Z-17/15Z. Surface winds: E-S 5-15kt. Winds aloft at 10kft
MSL: Variable up to 10 kt.
KBOI...
VFR with light winds.
&&
.PREV DISCUSSION...
SHORT TERM...Tonight through Thursday night...Amplification of
an upper ridge over the Intermountain West will bring a stretch
of dry and warm weather to the region. Temperatures will be on
the rise through Thursday with highs ranging 5-10 degrees above
normal which will put lower elevations into the mid-80s. Winds
will remain light and terrain driven through the period. Expect
coverage of mtn valley fog to decrease with each passing day as
a drier air mass sets in over the area.
LONG TERM...Friday through Tuesday...Clouds will increase on
Friday as an upper trough tracks along the NW US/Canadian
border as a second low pressure system along the central CA
coast lifts northward. These features will increase moisture
over the region late Fri/Sat, introducing a 10-15% chance of
afternoon showers/thunderstorms across SE Oregon and the along
ID/NV border. This threat shifts to the e-central Oregon and
w-central Idaho mtns on Sunday as an upper trough pushes in from
the coast. A period of brief ridging brings a break from any
precipitation early next week with a chance of rain returning
late Tuesday. Temperatures are above normal through the period.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.
&&
$$
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DISCUSSION...JR
AVIATION.....MC
SHORT TERM...DG
LONG TERM....DG

NWS BOI Office Area Forecast Discussion