790
FXUS65 KBOI 212036
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
236 PM MDT Fri Jun 21 2024

.SHORT TERM...Tonight through Sunday night...Temperatures will
be hot this weekend as a ridge of high pressure builds overhead.
Model blends indicate a 40-80% chance of hitting 100 degrees in
the Treasure Valley each day with the best chance on Saturday.
These temperatures are 15-20 degrees above normal, but a few
degrees shy of record highs. Clear skies and dry air will allow
overnight lows to drop into the low to mid 60s each night,
helping to mitigate heat concerns. Southwest flow aloft will
develop as the ridge axis shifts to our east, with breezy
conditions across the higher elevations starting Saturday and
increasing on Sunday. Wind gusts on Sunday will reach 25-35 mph
in the higher terrain, but will be lighter in the lower
elevations. An upper trough will move by to our north Sunday
night and push a dry cold front through our area. This will
bring locally breezy conditions Sunday night through the Snake
Plain, but no chance of precipitation.

.LONG TERM...Monday through Friday...A dry cold front will exit
to our east on Monday, allowing temperatures to cool by 5-10
degrees from Sunday, but still remaining around 10 degrees above
normal. West to northwest winds will be breezy behind the front,
especially in the Magic Valley and in higher elevations. An
upper level ridge will reamplify Tuesday and Wednesday with its
axis just to our east. Temperatures will be hot once again, and
although temperatures are currently forecast to reach the upper
90s, model blends indicate a 30-50% chance of reaching 100
degrees on Wednesday in the Treasure Valley. West to southwest
flow aloft will bring breezy conditions especially to the higher
terrain.

A pattern change is anticipated late Thursday and Friday as an
upper level trough moves through the Pacific NW. Temperatures
will cool considerably as this system pushes a cold front
through our area, with highs by Friday dropping to a few
degrees below normal. However, the core of the trough is
expected to remain to our north, bringing only a 10-20% chance
of showers and thunderstorms to higher elevations. Winds will
remain breezy as the trough moves through.

&&

.AVIATION...VFR. Surface winds: variable 10kt becoming NW 5-10kt
during the afternoon. Winds aloft at 10kft MSL: W-SW 5-15 kt.

KBOI...VFR. Surface winds NW 5-10kt, switching to SE 5-10kt around
22/06Z.

Weekend Outlook...VFR. Hot temperatures will bring high density
altitudes Saturday and Sunday. Surface winds W-SW 10-20kt during the
afternoons, light during the night.

&&

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

&&

$$

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SHORT TERM...ST
LONG TERM....ST
AVIATION.....KA