Emmett Weather

522
FXUS65 KBOI 050457
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
1057 PM MDT Fri Sep 4 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Showers and thunderstorms with local heavy rain today.

- Areas of valley fog late tonight and early Saturday morning.

- Temperatures 10 to 20 degrees below normal today, then around 10
  degrees below normal Saturday and Sunday.

- Cool Monday, then warming next week, with an increasing
  chance of thunderstorms Wednesday afternoon through Friday.

&&

.SHORT TERM /Through Sunday Night/...
Issued 254 PM MDT FRI SEP 4 2026
An upper level trough will remain along the Oregon coast over
the next day with a front stalled out over southwest Idaho.
Showers along the front this afternoon have kept temperatures
well below forecast from Rome OR to Boise ID to the central ID
mountains. Partial clearing in eastern OR has allowed conditions
to destabilize with isolated thunderstorms developing in eastern
OR late this afternoon, and near the Owyhee Mountains. Isolated
showers will continue overnight across the Boise mountains
before tapering off on Saturday afternoon as drier air moves in
from the southwest. Showers and thunderstorms will generally be
confined north and west of Baker County in OR and northeast of
Valley County in ID. The trough will begin to move inland on
Sunday and across southern ID late Sunday night, with showers
and thunderstorms areawide.

&&

.LONG TERM /Monday through Friday/...
Issued 254 PM MDT FRI SEP 4 2026
High pressure aloft will start to build over the area
Monday/Monday night as an upper low exits the region across
Montana into southern Canada. The higher pressure will bring
warmer air back into our CWA the rest of the week, with
temperatures approaching normal Wednesday and beyond. Drier air
will spread over the area Tuesday but moisture will be on the
increase again later in the week as the next upper low is
forecast to move into position near the Pacific Northwest coast
while southwesterly flow aloft taps into moisture from the next
westward-moving hurricane in the Pacific subtropics. We
therefore have a 20 percent chance of showers and thunderstorms
in the forecast as early as Wednesday afternoon near the Nevada
border, increasing to 20-40 percent across the forecast area
Thursday and Friday.

&&

.AVIATION /06Z Saturday through Sunday/...
Issued 1039 PM MDT FRI SEP 4 2026
Mainly VFR. Scattered showers continue overnight. Areas of
MVFR/IFR and mountain obscuration in heaviest precipitation.
Areas of MVFR/IFR in valley fog through early Sat morning. Snow
level 8k-10k feet MSL. Isolated showers and thunderstorms after
05/20Z in eastern Oregon, and dry elsewhere. Surface winds:
Variable through late morning, becoming SSW 5-10 kt this
afternoon. Winds aloft at 10kft MSL: SW 15-25 kt.

KBOI...VFR. Intermittent showers continue through early
morning. Areas of fog developing early Sat morning, but low
confidence (30% chance) of affecting the terminal. Winds
generally light and variable.

Sunday Outlook...Scattered showers and thunderstorm developing
area-wide Sunday afternoon, with potential for brief heavy rain
and gusty outflow winds. Areas of valley low stratus/fog Sunday
morning. SW-NW surface winds 5-15 kt with PM gusts to 20kt.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.

OR...None.

&&

$$

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AVIATION.....JR
SHORT TERM...KA
LONG TERM....TL