017
FXUS65 KBOI 242004
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
204 PM MDT Sat Oct 24 2026

.KEY MESSAGES...
- Dry with gradually warming temps through Monday morning. Frost
  and/or freezing temps in agricultural valleys Sunday morning.

- Light rain and mountain snow Monday afternoon through Tuesday
  morning.

- Cooler again Tuesday.

&&

.SHORT TERM /Through Monday Night/...
Coldest air occurred this morning with high pressure at the
surface under northwesterly flow aloft. Temps will now
gradually moderate through Monday as the next deep Gulf of
Alaska upper low approaches. Low temps tonight will be 15
to 25 degrees in eastern OR and the higher basins in ID, and
mid 20s to mid 30s elsewhere in ID. Highs Sunday will be in
the 50s to mid 60s, or 5 to 8 degrees warmer than today.
Lows Sunday night will be mid 20s to mid 30s in the mountains
and mid 30s to lower 40s in the valleys. Highs Tuesday will
drop back to the upper 40s through 50s. The upper low will
reach the OR coast by Monday morning and change flow aloft
to southwesterly over our CWA. Latest models it inland across
OR later Monday and across the northern part of our CWA Monday
night and Tuesday with light rain and mountain snow, mainly
over northern areas. Total precipitation will be lighter than
with the previous storm, generally .25 to .50 inch in northern
areas and .10 to .25 inch in southern mountains, but less than
.10 inch in southern valleys. However, this storm will be
colder than the previous one, and a dusting to 3 inches snow
accumulation is expected in northern areas above 4500 feet
Monday night through Tuesday morning. Winds will gradually
increase Sunday through Monday, becoming west or southwest
15 to 25 mph Monday afternoon, strongest on the Oregon side.

&&

.LONG TERM /Tuesday through Saturday/...
Strong agreement among ensemble members that an unsettled and
active weather pattern will set up over the region during most
of next week. While exact details remain to be seen, there is
strong agreement that a period of seasonably cool and moist
conditions will accompany this pattern change. Guidance suggests
that temperatures will be in the mid to upper 50s which is near
normal for late October. Mean precipitation values for the
period are around 0.2 inches for lower valleys, 0.5 inches for
mountain valleys, and greater than 0.6 inches for higher
terrain. Snow levels are expected to be between 5000 to 6000
feet, allowing for some early season snow accumulation.

&&

.AVIATION /18Z Saturday through Sunday/...
Issued 1114 AM MDT SAT OCT 24 2026
VFR with high pressure in control both at the surface and aloft
today into Sunday. High clouds on the increase this afternoon
and overnight ahead of an approaching Pacific trough. Surface
winds light less than 10 kt, with ESE direction favored across
south central Idaho and in/around KBKE. Increasing ESE gradient
Sunday afternoon ahead of approaching trough.

KBOI...VFR with some mid/high clouds. Surface winds ESE less
than 10 kt...increasing Sunday afternoon. Winds aloft at 10kft:
W around 15 kt, increasing to SSW 20-30 kt after 18Z Sunday.

Sunday Outlook...VFR with increasing mid/high clouds. ESE
surface gradient increasing after 18Z, with gusts over 20 kt
possible south and east of KBOI and over portions of SE Oregon.

&&

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

OR...None.

&&

$$

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SHORT TERM...LC
LONG TERM....MC
AVIATION.....MC