443
FXUS65 KBOI 020546
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
1146 PM MDT Thu Oct 1 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Dry with temperatures averaging 10-15 degrees above normal
  through next week.

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

&&

.SHORT TERM /Through Saturday Night/...
Issued 218 PM MDT THU OCT 1 2026
Dry westerly flow remains in place on Friday. There will be an
increase in high clouds as moisture off the CA coast is picked
up by the flow aloft. An upper ridge expands over the region on
Saturday which will result in lighter winds and continued
warming. High temperatures both days top out between 10 to 15
degrees above normal. Hazy conditions due to smoke will be seen
across portions of SE Oregon and the west-central ID mountains.

&&

.LONG TERM /Sunday through Thursday/...
Issued 218 PM MDT THU OCT 1 2026
The trend of warmer and drier than normal is set to continue
through the period, with temperatures staying 10 to 15 degrees
above normal. Sunday is forecast to be the warmest day with the
furthest north amplification of the upper-level ridge over the
area and southerly flow aloft. Temperatures are forecast to be
near record highs for the day across the region. On Monday, a
weak upper-level shortwave trough will move through the area,
suppressing the ridge further south. This system will increase
cloud cover and support a low chance (5-10%) of showers near the
NV border and south-central Idaho mountains. Temperatures will
cool by a couple of degrees Mon/Tue, before the upper ridge
rebounds and warm and dry conditions prevail.

&&

.AVIATION /06Z Friday through Saturday/...
Issued 1133 PM MDT THU OCT 1 2026
VFR with increasing high clouds through Friday morning. Areas
of thin smoke layers aloft/haze at the surface, mainly north of
KBNO and near KMYL. Patchy fog in sheltered mountain valleys in
the morning. Surface winds: variable or SE under 7 kt overnight
through Friday morning, then W-NW 5-10 kt in the afternoon.
Winds aloft at 10kft MSL: W-SW 10-20 kt.

KBOI...VFR with mostly clear skies. Surface winds: SE or
variable under 7 kt through the morning, becoming NW 5-10 kt
in the afternoon.

Weekend Outlook...VFR with mostly clear skies Saturday through
Sunday. Potential for thin smoke layers aloft and haze at the
surface due to prescribed burns in the region, mainly over southeast
OR and west-central ID. Surface winds: variable up to 10 kt.

&&

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

OR...None.

&&

$$

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AVIATION.....JY/ST
SHORT TERM...DG
LONG TERM....CH