Danner, Oregon Weather Forecast Discussion

817
FXUS65 KBOI 250831
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
231 AM MDT Thu Sep 25 2025
.SHORT TERM...Today through Saturday night...An upper level
ridge keeps clear skies and temperatures about 10 degrees above
normal for this time of year. A dry cold front will swing
through the region late Thursday through Friday morning.
Temperatures drop behind the front from 10 degrees above normal,
down to about normal. Still fairly warm as lower elevations see
highs in the mid 70s and high elevations highs in the mid 60s on
Friday. Additionally, the front will bring gusts of 20-30 mph
Friday morning through the afternoon. We remain dry with only a
brief increase in cloud cover ahead of the front. The front will
also help clear out some residual smoke in mountain valleys, but
hazy conditions from nearby fires in the west central mountains
of Idaho are possible. We warm up to 5 degrees above normal on
Saturday before a strong trough in the long term.
.LONG TERM...Sunday through Thursday...The high pressure dominated
pattern will give way to an unsettled period beginning early next
week. There is strong agreement (nearly 100%), amongst both
deterministic and ensemble data, that a Fall-like trough will impact
the region Monday through at least Wednesday. The trough is expected
to usher in temperatures 5-8 degrees below normal along with a
chance of precipitation area-wide. Snow-levels could drop as low as
7500 feet, meaning higher peaks may see their first dusting of snow
since Spring. Instability associated with the trough will help to
generate thunderstorms as well, with guidance suggesting a 20-30%
chance of thunder for most locations across eastern Oregon and
southwest Idaho. By Thursday there is good agreement that a ridge of
high pressure will rebound over the western US, with dry conditions
returning and temperatures climbing to near average.
&&
.AVIATION...VFR with mostly clear skies. A dry cold front is
anticipated for overnight into early Friday. Surface winds: E-SE 5-
15 kt ahead of the front, becoming NW 10-20 kt with higher gusts
after 05Z Friday. Winds aloft at 10kft MSL: S-SE 5-15 kt, becoming
NW 15-25 kt after 05Z Friday.
KBOI...VFR with mostly clear skies. Dry cold front to bring a wind
shift after 06/07Z Friday. Surface winds: SE up to 10 kt, becoming
WNW 10-20 kt after 06/07Z Friday.
Weekend Outlook...VFR to continue as high pressure builds in behind
a dry cold front. Increasing high clouds and building SE winds
beginning mid to late day Sunday ahead of a stronger trough that is
slated to impact the region early next week.
&&
.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