468
FXUS65 KBOI 270804
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
204 AM MDT Fri Jun 27 2025

.SHORT TERM...Today through Sunday night...A broad upper
trough over the northwest US will provide us dry weather
through Saturday night, with little day-to-day change in
temperature. Skies will be partly cloudy in the north and
mostly clear in the south. Stronger than normal west winds
aloft will result in breezy afternoon winds in the Snake
Basin and open terrain of eastern OR. The upper trough will
shift to Montana Sunday and a Pacific upper ridge will come
inland beginning a warming trend. The ridge will amplify
from the south Monday and bring hot weather to our CWA with
high temps near 100 degrees in southern valleys. In addition,
a Pacific upper low will set up off the California coast and
begin to circulate mid-level moisture northward toward our
CWA Sunday night.

.LONG TERM...Monday through Friday...The ridge of high
pressure will see peak heights on Monday, with heights in
the 90th percentile at 500mb for this time of year.
Afternoon max temps Monday and Tuesday will be about
10-15 degrees above normal. Currently the forecast calls
for some morning low temps to threaten records for the
daily warmest low, while being a few degrees under many
records for daily warmest high. This includes 100 degree
highs in the Treasure Valley, but up to 105 in the Emmett
Valley. Mountain valleys will be in the 90s and 80s.

This hot weather comes alongside increasing monsoonal
moisture Monday through Wednesday. A Four Corners high and
closed low off the California coast will set up a typical
monsoon pattern. This will support development of
high-based thunderstorms each day through Wednesday.
Tuesday shows the most widespread storm activity, with a
20% chance of thunder across much of SE Oregon and Idaho
high terrain as the low moves inland and provides favorable
dynamics. The stormy days coincident with the heat and
breakdown of the ridge is a pattern that is prone to
creating critical fire weather conditions.

Temps slightly cool after Wednesday, but are still hot at
5-10 degrees above normal. Another shortwave trough is set
to move through on Thursday, which would bring another push
of showers and thunderstorms to the region ahead of the 4th
of July holiday.

&&

.AVIATION...VFR. Surface winds: SW-NW 5-15 kt. Winds aloft
at 10kft MSL: SW 10-20 kt.

KBOI...VFR. Surface winds variable around 5 kt overnight,
becoming NW 10-20 kt Friday afternoon.

Weekend Outlook...VFR. Surface winds W-NW 5-15 kt. Afternoon
gusts 15-25 kt.

&&

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

&&

$$

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SHORT TERM...LC
LONG TERM....JM
AVIATION.....JM