568
FXUS65 KBOI 062040
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
240 PM MDT Sat Jun 6 2026

.KEY MESSAGES...
- High temperatures Sunday will be 10 degrees below normal with
  rain and snow showers possible in the west-central Idaho
  mountains.

- Showers Tuesday and Wednesday will bring additional
  precipitation, mainly to the mountains.

- Warmer and Drier after Thursday.

&&

.SHORT TERM /Through Monday Night/...
A unseasonably cool upper level trough will move into the
Pacific NW tonight, bringing cooler temperatures and breezy
conditions. Southwest Idaho and southeast Oregon will be on the
dry slot of this system, so precipitation will generally be
confined to the west central ID mountains and mountains in Baker
County OR, with snow levels around 5000-6000 feet Sunday
morning. Conditions dry out by Sunday afternoon as the system
quickly moves east, with windy and dry conditions following the
front. A Red Flag Warning has been issued for very dry and
windy conditions Sunday afternoon in the Magic Valley.
Dewpoints reach the single digits on Sunday afternoon across
much of the area, with low relative humidities. Winds calm after
sunset Sunday as the system quickly moves east. Monday is a
transition day before the next frontal system arrives late
Monday night. Increasing clouds and showers developing in
eastern Oregon late Monday afternoon, moving into southwest
Idaho by late evening. Temperatures will be around 10 degrees
below normal Sunday before moderating to near normal on Monday.

&&

.LONG TERM /Tuesday through Saturday/...
The upper-level trough that began moving through at the end of
the short term period will continue to move east Tuesday and
Wednesday. A well-defined cold front will move eastward across
our zones during this time, supported by the deep upper low
moving across WA and Northern ID. The low will move across
northern ID Tuesday night and into MT Wednesday. This track will
continue cool, showery, and frequently windy weather in our
CWA, with snow levels lowering to near 6000 ft early Wednesday.
Total QPF through Thursday is 0.25 to 0.75 inches in Idaho north
of the Snake Basin, and in eastern Baker County/OR. Elsewhere,
QPF is 0.05 to 0.25 inches, including the Snake Basin in ID. The
least amount of precipitation (around 0.05 inch) is expected in
central and northern Malheur County/OR. Snow may accumulate
near an inch in eastern Valley County and northern Boise and
Elmore Counties above 6000 feet. As the upper low exits
Wednesday, continued northwesterly flow aloft will persist,
maintaining the cool wx into Thursday, at least on the Idaho
side. On Friday, our CWA will begin a warming and drying trend
that will last through at least next weekend.

&&

.AVIATION /18Z Saturday through Sunday/...
Issued 1237 PM MDT SAT JUN 6 2026

VFR with increasing low-to-mid clouds beginning this afternoon.
After 06z/Sun, scattered to numerous rain and snow showers near
KMYL. Snow levels 5-6 kft during precip. Mountains obscured in
precipitation and low ceilings. Surface winds: NW 10-15 kt,
widespread gusts to 20 kt. Gusts up to 30 kt in the MUO to
TWF/JER corridor this afternoon. After 00Z/Sun, W-NW gusts 25 to
35 kt move SE from KBKE through the Snake River Plain
overnight. Winds aloft at 10kft MSL: W/SW 15-30kt.

KBOI...VFR. Increasing low-to-mid clouds after sunset. Surface
winds: NW 15kt, gusting 25 kt.

Sunday Outlook...VFR. Scattered low-to-mid clouds through late
morning. Gusty W-NW surface wind 15-30 kt in the Snake Basin
and south to NV border. Scattered rain/snow showers and local
mountain obscuration in the West-Central Idaho mountains.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Red Flag Warning from Sunday afternoon through Sunday
     evening for IDZ424-426.
OR...None.

&&

$$

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