948
FXUS65 KBOI 050920
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
320 AM MDT Fri Jul 5 2024

.SHORT TERM...Today through Sunday night...An anomalously strong
upper high pressure ridge remains near the west coast through
the weekend with a dry northwest flow residing over SE Oregon
and SW Idaho. A couple of weak upper troughs moving through the
northern Rockies will enhance the winds across south-central
Idaho, especially Saturday afternoon with gusts to around 30
mph. Moisture associated with both of these troughs will track
to far to the east for any showers in our area. Temperatures
are expected to be hottest compared to normal across SE Oregon
due to the closer proximity to the ridge with highs in the 90s
to around 100 degrees. An Excessive Heat Watch remains in effect
for SE Oregon and far SW Idaho this weekend.

.LONG TERM...Monday through Friday...The heat expands further
eastward and northward with the building ridge to our west as it
moves closer each day through midweek. Widespread hot temperatures
well above 100 degrees are forecast for the lower valleys by
Tuesday, and above 105 degrees Wednesday and Thursday. Many
locations are likely to receive record or near record highs. An
Excessive Heat Watch is in effect for all of SE Oregon and SW
Idaho, including the mountain valleys where highs are forecast
to be well into the 90s. The heat wave will likely continue
through the end of the week, although limited monsoon moisture
arriving from the south could bring some clouds to alleviate the
hottest temps. Dry conditions prevail through the week, although
any increase in monsoon moisture would result in at least a
slight chance (<25 percent) of showers/thunderstorms toward the
latter half of the week.

&&

.AVIATION...VFR under clear skies. Surface winds: variable less
than 10 kt becoming W to NW 5-15 kt with gusts to 20 kt after
18Z. Winds aloft at 10kft MSL: NW 10-20 kt.

KBOI...VFR under clear skies. Variable or southeast winds 3-6
kt becoming W to NW 5-15 kt with gusts to 20 kt after 18Z.

Weekend Outlook...VFR and mostly clear. High density altitude due to
hot temperatures. Variable winds less than 10 kt during the late
evenings through mornings, and generally NW 5-15 kt with gusts of 15-
25 kt during the afternoons and early evenings.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Excessive Heat Watch from Tuesday afternoon through Thursday
     evening IDZ011-013-028.
     Excessive Heat Watch from Saturday afternoon through Thursday
     evening IDZ012-029.
     Fire Weather Watch this evening IDZ424-426.
     Excessive Heat Watch from Monday afternoon through Thursday
     evening IDZ014>016-030-033.
OR...Excessive Heat Watch from Saturday afternoon through Thursday
     evening ORZ061>064.

&&

$$

www.weather.gov/Boise

Interact with us via social media:
www.facebook.com/NWSBoise
www.twitter.com/NWSBoise

SHORT TERM...BW
LONG TERM....BW
AVIATION.....BW