Mesa, Idaho Weather Forecast Discussion

087
FXUS65 KBOI 232015
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
215 PM MDT Tue Sep 23 2025
.SHORT TERM...Tonight through Thursday night...A ridge of high
pressure will remain over the region through the short term.
Breezy southeast winds expected during the afternoons on Tuesday
and Wednesday through the I-84 corridor in Baker County, and
the Treasure Valley to the Magic Valley. Elsewhere, breezy
southeast winds mainly on the ridgetops during the day with
light winds at night. Temperatures warm to around 10 degrees
above normal on Wednesday and continue through Thursday. A dry
cold front moves across WA and northern ID Thursday and brings
increased west-northwest winds late Thursday.
.LONG TERM...Friday through Tuesday...Broad ridging behind a
closed low over CA/NV is expected to slowly build into the upper
Great Basin and SE OR/SW ID through Friday and into the
weekend, returning a slight warming trend. Peak valley
temperatures are expected to climb back up into the mid 80s
Saturday and Sunday. The closed low off CA/NV is expected to
stall throughout Saturday before moving NE`ward as a longwave
trough on Sunday, steering some monsoonal moisture off the Four
Corners region into the area. This will favor isolated
showers/thunderstorms, mainly over higher elevations and the
lower Magic Valley, late Sunday into Monday. A strong upper low
over the Gulf of Alaska is expected to dig into the Northwest
coast through Monday and Tuesday, bringing higher chances for
showers/thunderstorms throughout the area early next week.
Considerable uncertainty remains over the timing and intensity
of the precipitation carried over by this incoming trough.
&&
.AVIATION...VFR with clear skies. Wildfire smoke over Eastern OR
has dissipated, but some may remain aloft. Surface winds: E-SE
5-15 kt. Winds aloft at 10kft MSL: E-NE 10-20 kt.
KBOI...VFR with clear skies. Surface winds: SE 8-12 kt through the
afternoon, with gusts up to 20 kt until around 22z.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.
&&
$$
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SHORT TERM...KA
LONG TERM....JY
AVIATION.....JY

NWS BOI Office Area Forecast Discussion