491
FXUS65 KBOI 062036
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
236 PM MDT Sun Sep 6 2026

.KEY MESSAGES...
- Cold front with widespread showers, isolated thunderstorms,
  and gusty winds, coming in from the west late today and
  tonight.

- 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 Tuesday Night/...
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 /Wednesday through Sunday/...
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 /18Z Sunday through Monday/...
Issued 1136 AM MDT SUN SEP 6 2026
Numerous showers and scattered thunderstorms in E Oregon this
afternoon, shifting into SW Idaho this evening. While generally
VFR, MVFR-IFR in local heavy rain, and gusty outflows with
storms. IFR low clouds will also develop in the Upper Snake
Plain and ID mountains tonight. Surface winds: becoming W-NW
10-15 kt, gusts to 30 kt possible this afternoon/evening,
except gusts 35-45 kt and local MVFR in blowing dust from KMUO
through KJER and KTWF in the evening. Winds aloft at 10kft MSL:
S-SW 15-25 kt.

KBOI...A 50% chance of showers this evening with isolated
thunderstorms embedded in showers. Surface winds: NW 10-15 kt,
then NW 15-30 kt this evening.

&&

.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

SHORT TERM...KA
LONG TERM....KA
AVIATION.....JM