751
FXUS65 KBOI 070257
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
857 PM MDT Mon Oct 6 2025

.DISCUSSION...Another cold night is ahead as clear skies and
light winds create ideal conditions for radiational cooling
across the area. A Frost Advisory has been issued for the
agricultural areas of the Snake Basin, including the Treasure
Valley and the western Magic Valley, effective from 4 AM to 9 AM
MDT Tuesday. Overnight low temperatures in the advisory area
will range from 33 to 38 degrees, though isolated spots could
fall to between 30 and 32 degrees. The Boise metro area is
expected to avoid a frost, with lows forecast to be warmer,
between 38 and 42 degrees. Higher elevation valleys and basins
will be even colder, with temperatures dropping into the 20s.

A warming trend will begin on Tuesday with a building high
pressure system for sunny skies. High temperatures on Tuesday
will be about 5 degrees warmer than today, followed by another 5
degree warm up on Wednesday.

&&

.AVIATION...VFR with clear skies over all areas this
evening and overnight. Surface winds: E-SE or variable less than 10
kt overnight. Winds aloft at 10 kft MSL: E-NE 5-10 kt.

KBOI...VFR with clear skies. Surface winds: NW 5-10 kt becoming SE 3-
6 kt tonight after 04Z.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Wednesday night...Another Frost
Advisory has been issued for the agricultural areas in the
Snake Basin, this time for the Treasure Valley as well as the
western Magic Valley, valid 4 AM to 9 AM MDT Tuesday. Low temps
there will be between 33 and 38 degrees but frost can form at
air temps as warm as 36 degrees under clear skies and calm
winds. Isolated spots will dip to 30-32 degrees. The Boise
metro will not frost, with lows there between 38 and 42 degrees.
Higher-elevation valleys and basins will dip to the 20s. High
pressure aloft and clear skies will bring warming days, with
highs Tuesday about 5 degrees warmer than today, and Wednesday
another 5 degrees. Lows Wednesday morning will be 1-3 degrees
warmer than Tuesday, and Thursday morning another 3-5 degrees
warmer.  Winds will be east or southeast 5 to 15 mph through
Wednesday night, except gusts 25 to 30 mph Wednesday afternoon
in the Snake Basin east of Boise.

LONG TERM...Thursday through Monday...A deep low pressure system
near Vancouver Island will push into the Pacific Northwest on
Thursday, with southwest flow ahead of the low bringing warm,
breezy, and dry conditions to our region. Temperatures will
likely hit at least 80F in the lower elevation valleys by
Thursday. The low will then move south and slightly inland,
bringing cooler temperatures and a slight chance of rain to the
region on Friday.

After Friday, model disagreement increases with the track of
the low. Some members have it deepening into a closed low to
our south, while others have it weakening into a trough.
Regardless, all members show cooler air and widespread
precipitation moving into the region during the weekend with
the largest uncertainty in precipitation amounts and location.
The coolest and wettest solutions show temperatures about
10-15 degrees below normal and snow down to 5000 feet MSL
by Sunday. Accumulations will likely be light in mountain
valleys, but there is a 5-10% chance of seeing at least 2 inches
of snow in McCall on Sunday. Higher elevations will see better
chances of accumulation, with Banner Summit seeing a 20% chance
of 4 inches of snow by Sunday. Another low could move in quickly
behind this one on Monday, bringing even cooler and wetter
conditions to the region.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Frost Advisory from 4 AM to 9 AM MDT Tuesday IDZ012-014-016.
OR...Frost Advisory from 4 AM MDT /3 AM PDT/ to 9 AM MDT /8 AM PDT/
     Tuesday ORZ064.

&&

$$

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DISCUSSION...JDS
AVIATION.....JY
SHORT TERM...LC
LONG TERM....SA