242
FXUS65 KBOI 090031
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
631 PM MDT Mon Jun 8 2026

.UPDATE...Updated aviation discussion.

&&

.KEY MESSAGES...
- A cold front arrives this evening with widespread showers
  through Tuesday morning.

- Seasonably cool on Tuesday with a slight chance of
  thunderstorms in the central Idaho Mountains.

- Warming and dry Wednesday through Monday.

&&

.SHORT TERM /Through Wednesday Night/...
Issued 229 PM MDT MON JUN 8 2026
A cold front is advancing eastward across Oregon, preceded by
extensive mid-level cloudiness. Ahead of the front, a very dry
air mass is in place, with humidity values near 10 percent
through much of the Snake Plain, amidst winds gusting to 20-30
mph. Scattered to widespread showers will develop through this
evening first across central Oregon, reaching the Treasure
Valley after around 9 PM MDT. Although coverage will be high,
rainfall amounts and intensity will be limited by how dry the
sub-cloud layer is. In fact, the 18Z BOI precipitable water
reading of 0.43" is close to the 25th percentile for the date.
QPF amounts are generally expected to range between 0.1-0.25"
across the Snake Plain, and up to 0.25-0.5" in the Idaho
Mountains. There`s a 10% chance of 1" of rain occurring in
McCall and over the West-Central Mountains.

By Tuesday morning, the cold front will advance eastward, but a
more unstable air mass will take hold and support isolated
thunderstorm development over the central Idaho Mountains -
especially over Valley County.  Otherwise, breezy conditions
will occur from southeast Oregon into southern idaho, wind
gusts approaching 30-40 mph during the afternoon. Temperatures
will also be 5-10 degrees below normal through Wednesday. Near-
freezing temperatures are possible Wednesday and Thursday
morning in parts of southeast Oregon (including Burns and Baker
City), and higher elevation valleys in Idaho (including McCall
and the Camas Prairie). In fact, a dusting of snow is also
possible across the mountains of Valley County as snow levels
fall to around 5800 feet.

&&

.LONG TERM /Thursday through Monday/...
Issued 229 PM MDT MON JUN 8 2026
will build over the Pacific Northwest bringing dry weather and a
warming trend.  Temperatures will be near normal on Thursday and
then warm to around 10 degrees above normal through the upcoming
weekend.  Skies will be mostly clear through the period with no
precipitation expected. Winds will be light and variable.

&&

.AVIATION /00Z Tuesday through Wednesday/...
Issued 624 PM MDT MON JUN 8 2026

A cold front will move from west to east through the area
tonight. Rain with MVFR ceilings will accompany the front. Snow
levels: 7-9 kft MSL. Precipitation will gradually end for most
sites after 10Z in Oregon and after 14Z in Idaho, however
precipitation, lower ceilings, and mountain obscuration will
remain around KBKE, KMYL, and KTWF/KJER through the afternoon
Tuesday. Surface winds: SW-NW 15 to 20 kts . Winds aloft at 10
kft: W-SW 25 to 40 kts.

KBOI...Generally VFR. A cold front will pass through Boise
tonight around 04Z with a period of rain and MVFR ceilings
possible (10-20% chance) from 04Z-10Z tonight. Surface winds:
W-NW 10-15 kt with gusts 20-25 kt, becoming light and variable
overnight.

&&

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

OR...None.

&&

$$

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AVIATION.....CH
SHORT TERM...JR
LONG TERM....JB