733
FXUS65 KBOI 070628
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
1228 AM MDT Mon Sep 7 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...

- Breezy and cooler Monday, with showers continuing in the
  north, but becoming sunny in the south.

- Warmer and drier Tuesday through Thursday.

- Cooler and unsettled conditions possible on Saturday and
  Sunday.

&&

.SHORT TERM /Through Wednesday Night/...
Issued 236 PM MDT SUN SEP 6 2026
An upper level trough continues to track across southern OR
this afternoon. Showers and thunderstorms increase late this
afternoon across eastern OR, with isolated showers and
thunderstorms over the west central ID and Owyhee mountains.
Showers will increase in coverage this evening as the upper
level low tracks across southern ID early Monday morning. The
precipitation will quickly taper off across eastern OR and the
Snake Basin in southwest ID early Monday morning, with lingering
showers over the central ID mountains through Monday afternoon.
A convergence zone will set up in wake of the Wallowas late
Monday afternoon keeping showers and thunderstorms north of
McCall late into the evening. Drier and warmer conditions
expected on Tuesday.

&&

.LONG TERM /Thursday through Monday/...
Issued 236 PM MDT SUN SEP 6 2026
A warming trend will continue Wednesday through Thursday as the
cool core upper level trough moves east with weak ridging. A
trough from the Gulf of Alaska will move south along the BC
coast into the Pacific NW by Saturday with cooler and windy
conditions possible next weekend. Uncertainty remains elevated
in the extended period, as tropical activity in the Pacific
enhances the jet stream. Models do not handle the energy
transfer well in these situations so expect lots of changes in
the far extended period over the next week with all these
tropical systems across the Pacific.

&&

.AVIATION /06Z Monday through Tuesday/...
Issued 1227 AM MDT MON SEP 7 2026
Cold front moving W to E, bringing scattered showers and isolated
lightning in NE Oregon and central Idaho through Monday morning.
Then, isolated showers in w-central Idaho Monday afternoon. MVFR in
heavier showers. Snow levels 8kft MSL. Patchy fog/low stratus in
mountain valleys and near KJER through morning. Mountains obscured,
improving Monday afternoon. Surface winds: decreasing to SW-NW 5-15
kt overnight. Winds aloft at 10kft MSL: W 15-25 kt.

KBOI...Generally VFR. A 10% chance of rain showers before Mon/09Z.
Surface winds: NW or variable around 5 kt.

&&

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

OR...None.

&&

$$

www.weather.gov/Boise

Interact with us via social media:
www.facebook.com/NWSBoise
www.x.com/NWSBoise

AVIATION.....SH
SHORT TERM...KA
LONG TERM....KA