996
FXUS65 KBOI 282331
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
531 PM MDT Mon Sep 28 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- Breezy northwest winds in the Snake Plain each afternoon
  through Wednesday.

- Fair skies and warmer temperatures through this weekend.

&&

.SHORT TERM /Through Wednesday Night/...
Issued 157 PM MDT MON SEP 28 2026
As a trough moves east, high pressure builds to the south of our
forecast area. Zonal flow will cap off the high pressure,
leading to a moderated warming trend up to about 5 degrees above
normal in the short term. Dry/fair weather is expected through
the period, as moisture in the flow is positioned along the
Canada-US border. West to northwest surface winds will become
breezy each afternoon in the Snake Plain, especially between
Boise and Twin Falls. The breezy 20-30 mph peak wind gusts occur
in an area where forecast minimum relative humidities are around
15-20%, creating elevated fire weather though in a very
localized portion of the high desert. Surface winds begin to
taper off heading into the long term forecast.

&&

.LONG TERM /Thursday through Monday/...
Issued 157 PM MDT MON SEP 28 2026
The area will remain under a flattened ridge north of a massive
Pacific high slowly building into the Great Basin region. This
continuous ridging pattern will favor clear skies, dry conditions,
and the return of warmer than normal temperatures Thursday through
Friday. A weak shortwave trough passing north of our area late
Friday may bring in some high cloud coverage, possibly moderating
the daytime temperatures on Saturday. Otherwise, broad Pacific
ridging will dominate the region Sunday through early next week,
continuing a much warmer and drier than normal pattern in the
extended outlook.

&&

.AVIATION /00Z Tuesday through Wednesday/...
Issued 527 PM MDT MON SEP 28 2026

VFR. Patchy morning fog/low stratus in sheltered mountain
valleys Tuesday morning. Surface winds: SW-NW 5-15 kt, gusts to
25 kt from KBOI to the south/east through evening. Winds aloft
at 10kft MSL: NW 5-15 kt.

KBOI...VFR. Surface winds: W-NW 10-15 kt with gusts to 20-25 kt,
lowering to 6-11 kt in the evening after Tue/02Z.

&&

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

OR...None.

&&

$$

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AVIATION.....CH
SHORT TERM...JM
LONG TERM....JY