546
FXUS65 KBOI 010006
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
606 PM MDT Wed Sep 30 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Dry with temperatures trending 5-15 degrees above normal
  through next week.

- Minor disturbance on Monday could bring a showers to higher
  terrain along the NV border and south-central Idaho mountains.

&&

.SHORT TERM /Through Friday Night/...
Issued 235 PM MDT WED SEP 30 2026
Dry westerly flow will bring gradual warming through Friday.
Efficient radiational cooling overnight will allow for wide
diurnal temperature spreads as high temperatures reach 10-15
degrees above normal by Friday. Weaker flow aloft will translate
to lighter winds. Wild/prescribed fires, mostly across Oregon
at this time, will likely keep haze in the region through the
end of the week.

&&

.LONG TERM /Saturday through Wednesday/...
Issued 235 PM MDT WED SEP 30 2026
The weekend will bring further warming as an upper ridge expands
northward from the Desert SW. A weak disturbance forecast to
track through the northern Great Basin on Monday will bring a
low chance of showers and possibly a thunderstorm to areas along
the northern NV border and into s-central Idaho mtns. Otherwise
warm and dry conditions will continue through the middle of
next week with high temperatures holding 10-15 degrees above
normal (low-mid 80s at lower elevations).

&&

.AVIATION /00Z Thursday through Friday/...
Issued 602 PM MDT WED SEP 30 2026
VFR with mostly clear skies. Local haze due to smoke, mainly
north of KBNO-KONO-KMYL, this evening through overnight. Patchy
fog in sheltered mountain valleys Thursday morning. Surface
winds: W to NW 5-15 kt with gusts to 20 kt through sunset, then
mostly light and variable overnight. Winds aloft at 10kft MSL:
NW 10-20 kt.

KBOI...VFR with clear skies. Northwest surface winds through
sunset with occasional gusts of 15-20 kt. Mostly light and
variable overnight through Thursday morning.

&&

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

OR...None.

&&

$$

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AVIATION.....JY
SHORT TERM...DG
LONG TERM....DG