143
FXUS65 KBOI 270013
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
613 PM MDT Sun Jul 26 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Warm and dry conditions will persist over the next several
  days.

- Smoky conditions will limit high temperatures by a few degrees
  and bring degraded air quality.

- Slightly cooler with near-normal temperatures through
  midweek.

&&

.SHORT TERM /Through Tuesday Night/...
Issued 243 PM MDT SUN JUL 26 2026
Southwest flow continues over the area with widespread smoke
from area wildfires, with the exception of mostly clear skies
along the NV border. Isolated showers and thunderstorms continue
this afternoon, mainly over the central ID mountains and along
the NV border. Smoky conditions have kept temperatures lower
than forecast this afternoon by 5-10 degrees. Have adjusted
temperatures Monday and Tuesday slightly lower to account for
wildfire smoke using the RRFS and HRRR models. Little
improvement expected to wildfire smoke due to lighter winds
aloft over the next several days.

&&

.LONG TERM /Wednesday through Sunday/...
Issued 243 PM MDT SUN JUL 26 2026
Southwest flow aloft will be the name of the game in the long-
term period. With high pressure aloft over the Four Corners
region, and troughing over British Columbia, conditions will
remain warm, dry, and breezy. Later in the week, the high
pressure aloft will begin to shift over the Great Basin,
allowing for temperatures to rise to around 5 degrees above
normal. Afternoon breezes will increase come Saturday and
Sunday, as a shortwave associated with the aforementioned trough
moves inland and tightens the pressure gradient over our area.
A cold front associated with the shortwave will sag south come
this weekend, allowing for temperatures to cool to near, or even
slightly below, normal by Sunday.

&&

.AVIATION /00Z Monday through Tuesday/...
Issued 555 PM MDT SUN JUL 26 2026

Wildfire smoke resulting in areas of MVFR/IFR visibility.
Slight improvement in visibility during mid afternoons, before
degrading again overnight and early Mon/AM. Potential for high
density altitude due to PM heat. Surface winds: NW-SW 5-15 kt.
Evening gusts around 25 kt in portions of E Oregon. Winds aloft
at 10kft MSL: SW 10-20 kt.

KBOI...Visibility degraded to MVFR/IFR due to wildfire smoke.
Worst conditions expected early Mon/AM. Potential for high
density altitude due to PM heat. Surface winds: NW 6-12 kt
before sunset. Then variable 2-6 kt overnight.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Air Quality Alert until 2 PM MDT Tuesday for IDZ011>015-028-
     029-033.
OR...Air Quality Alert until 11 AM PDT Monday for ORZ062.
&&

$$

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