695
FXUS65 KBOI 250600
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
1200 AM MDT Sat Jul 25 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Very hot, dry, and breezy to end the week.

- Smoky from new wildfires across the area.

- Critical fire weather conditions, mainly over southeast OR and
  high terrain of southwest ID, through Saturday evening.

- Afternoon scattered thunderstorms for southern Twin Falls
  County through Saturday, with gusty outflow winds up to 50
  mph; A 10 percent chance of thunderstorms over the Boise and
  Owyhee Mountains.

&&

.SHORT TERM /Through Monday Night/...
Issued 241 PM MDT FRI JUL 24 2026
Southwest flow aloft continues over the area with hot, dry and
smoky conditions today and Saturday. Critical fire weather
conditions remain through Saturday evening, with low relative
humidities and breezy conditions during the afternoons. Single
digit relative humidities possible across eastern OR this
afternoon and much of the area Saturday afternoon as a dry slot
sets up over eastern OR and southwest Idaho. Lingering monsoon
moisture will slowly get eroded away by the dry slot. Scattered
thunderstorms across southern Twin Falls County through this
evening with gusty outflow winds up to 50 mph, and a 10 percent
chance of thunderstorms over the Boise and Owyhee Mountains this
evening. Westerly flow on Saturday will allow for northwest
winds to develop through the Baker Valley corridor to Ontario
Saturday evening and Sunday evening with gusts in exposed areas
up to 40 mph. This will help to bring smoke over central OR down
the Baker Valley into the Snake Basin both days as well. New
large fires in eastern OR and Owyhees will also contribute to
increased smoke. Temperatures cool a few degrees on Saturday and
a few more on Sunday.

&&

.LONG TERM /Tuesday through Saturday/...
Issued 241 PM MDT FRI JUL 24 2026
High pressure aloft over the Four Corner region, and troughing
off the British Columbia coast, will keep our area under
southwesterly flow aloft. This troughing will help keep
monsoonal moisture south and east of our area, leading to hot,
dry, and breezy conditions throughout the long-term period. Late
in the week the Four Corners high will begin to shift west over
the Great Basin, allowing for a warming trend. Temperatures
will be near normal to start the coming week, before rising to
around 5 degrees above normal come Wednesday.

&&

.AVIATION /06Z Saturday through Sunday/...
Issued 1200 AM MDT SAT JUL 25 2026
Wildfire smoke leading to visibility reductions, with areas of MVFR
and mtn obscuration in E-Oregon and W-Idaho. Smoke most notable
overnight with some improvement during daytime. Isolated
thunderstorms returning near KTWF in the afternoon, capable of
outflows to 35-45 kt and brief heavy rain. High density altitude
during PM due to heat. Surface winds: variable 5-15 kt overnight.
Then, SW-NW 10-20 kt with gusts to 20-30 kt in the afternoon,
strongest in E-Oregon and higher terrain of SW Idaho. Winds aloft at
10kft MSL: SW 15-30 kt.

KBOI...VFR with hazy conditions due to wildfire smoke. High density
altitude during PM due to heat. Surface winds: variable or SE around
5 kt overnight, returning to NW 5-12 kt after Sat/15Z.

Sunday Outlook...Wildfire smoke with areas of MVFR visibility and
mtn obscuration during night/morning hours, slightly improving for
the afternoon. A 10% chance of showers/thunderstorms Sunday AM,
mainly south of KEUL-KSNT line in SW Idaho. High density altitude
during PM due to heat. Surface winds: SW-NW 5-15 kt with gusts to 25
kt Sunday. Highest gusts will favor E Oregon and Owyhees.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Air Quality Alert until noon MDT today for IDZ011-012-014-033.
     Red Flag Warning until 9 PM MDT this evening for IDZ401-402-
     423.
     Heat Advisory until 9 PM MDT this evening for IDZ012-014-016-
     033.
OR...Red Flag Warning until 9 PM MDT /8 PM PDT/ this evening for
     ORZ670>675.
     Heat Advisory until 9 PM MDT /8 PM PDT/ this evening for
     ORZ063-064.
     Air Quality Alert until 11 AM PDT Monday for ORZ062.
&&

$$

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