McCall, Idaho 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

532
FXUS65 KBOI 130821
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
221 AM MDT Wed Aug 13 2025

.SHORT TERM...Today through Friday night...Not quite as hot as
yesterday but still plenty hot again today especially in
southern Idaho, as the surface thermal axis shifts gradually
eastward. A Heat Advisory will continue in the Oregon Lower
Treasure Valley through 9 PM MDT today, not only for the
afternoon heat but also for the currently warm nighttime
temperatures that provide only limited relief from the hot
days. Latest water vapor imagery shows mid-level moisture still
present over southern Idaho, originating from both the eastern
Pacific subtropics and from the monsoon source in AZ, NM, and
Mexico. This moisture will develop isolated showers and
thunderstorms (15 to 25 percent coverage) late today and again
late Thursday in southeast Owyhee and southern Twin Falls
Counties. Thunderstorms should have outflow wind gusts up to 50
mph but little rain. Hi-res models show no other showers or
storms in our CWA either today or Thursday, but they do suggest
afternoon cloud buildups in the southern Boise Mountains.
Satellite imagery also shows a weak north Pacific upper trough
currently coming inland. Models take this trough eastward across
our northern zones later today through Friday, but all parts of
our CWA should cool to normal Thursday and Friday.

.LONG TERM...Saturday through Wednesday...Deeper moisture from
farther out in the north Pacific is forecast to come inland
over WA and northern OR beginning Friday and reach Baker County
Saturday, and most of eastern OR Saturday evening, with a 20 to
50 percent chance of showers and thunderstorms. This system
looks like a winter-type frontal system, the first one since
last spring. The storm`s cold front is forecast to weaken as
it moves into and stalls over our CWA Saturday evening through
Sunday, then retreats northward as a warm front Sunday night
and Monday. Our forecast has a 15 to 30 percent chance of
showers and thunderstorms near the frontal zone on those days.
We also have a 15 to 20 percent chance of showers and
thunderstorms near the NV/ID border Sunday afternoon and evening
as a stronger southerly wind component aloft more effectively
taps into monsoon moisture in the southern Rockies. Not all
models agree on this, however, and later forecasts may change.

&&

.AVIATION...VFR. Isolated thunderstorms south of KTWF 13/21Z
through 14/03Z. High density altitude due to hot afternoon
temperatures.  Surface winds: Variable less than 10 kt through
13/18Z then NW 10-20 kt with gusts to 25 kt through 14/01Z.
Winds aloft at 10kft MSL: SW 10-15 kt.

KBOI...VFR. High density altitude in the afternoon. Surface
winds: light and variable until 13/18Z, then NW 10-15 kt with
gusts to 22 kt until 14/01Z.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...Heat Advisory until 9 PM MDT /8 PM PDT/ this evening ORZ064.

&&

$$

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