666
FXUS65 KBOI 241230
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
630 AM MDT Mon Aug 24 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Scattered thunderstorms south of a line from Burns OR to
  Jordan Valley OR to Twin Falls ID, this afternoon and evening.

- Thunderstorms capable of producing outflow winds up to 55 mph
  this afternoon and evening.

- Little chance of thunderstorms the rest of the week, except a
  slight chance in the central ID mountains Wednesday afternoon,
  and near the NV/ID border Friday-Sunday afternoons.

- Warming Monday and Tuesday, holding level Wednesday, then
  gradually cooling the rest of the week.

&&

.SHORT TERM /Through Wednesday Night/...
Issued 430 AM MDT MON AUG 24 2026
Upper level ridge will rebound over the area and bring warmer
temperatures today and monsoonal moisture from the south.
Moisture values in the atmosphere increase from the 20th
percentile to the 85th percentile by this evening. A shortwave
moving in the southwest flow aloft will trigger scattered
showers and thunderstorms over far SE Oregon and southern ID
south of the Snake Basin, generally from Burns OR, to the Owyhee
Mountains to Twin Falls ID and areas south. Storms will
generally weaken into showers as they move northeast into the
Snake Basin, but outflows up to 55 mph and blowing dust will
still be a threat. Showers taper off overnight into Tuesday.
Lingering moisture will remain over the area for isolated
thunderstorms on Tuesday afternoon over southwest Idaho. A weak
wave will move over the region on Wednesday with mostly cloudy
skies. Thunderstorm development will be limited on Wednesday due
to cloud cover, but isolated thunderstorms over southwest Idaho
possible.

&&

.LONG TERM /Thursday through Monday/...
Issued 430 AM MDT MON AUG 24 2026
An upper level trough off the West Coast will push the monsoon
moisture south and east of our area. Height falls throughout the
period will allow for a slight cooling trend. Temperatures will
be around 5 degrees above normal Thursday, before cooling to
near normal Friday and Saturday, and slightly below normal on
Sunday. Uncertainty begins to increase late this week,
following the lifting of the initial trough and associated
frontal passage 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.

&&

.AVIATION /12Z Monday through Tuesday/...
Issued 623 AM MDT MON AUG 24 2026
VFR. Areas of wildfire smoke. Scattered thunderstorms this
afternoon south of a line from KBNO-KMAN-KTWF. Surface winds:
variable 5-10kt, except gusty erratic outflow winds up to 45kt
possible this evening causing BLDU. Winds aloft at 10kft MSL:
SW 10-20 kt.

KBOI...VFR. Isolated showers this evening. Surface winds:
variable 5-10kt. Gusty outflow winds up to 35kt possible this
evening.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Red Flag Warning from noon today to 8 PM MDT this evening for
     IDZ423-426.
OR...Red Flag Warning from 3 PM this afternoon to 8 PM PDT this
     evening for ORZ670>672.
&&

$$

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