044
FXUS65 KBOI 230249
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
849 PM MDT Sat Jun 22 2024

.DISCUSSION... Hot afternoon maximum temperatures running 15 to
20 degrees above normal were observed across southwestern Idaho
and southeastern Oregon this afternoon. It doesn`t appear that
any record highs were broken today...but we were within a
couple of degrees of breaking records in most areas. For
example...Boise reached a high of 102 which was 2 degrees cooler
than the record high for the date, set in 1988. Light winds,
clear skies and a very dry atmosphere will allow for excellent
radiational cooling overnight. Another hot sunny day is on tap
for tomorrow, but it will be a little breezier in the afternoon
in most areas.

&&

.AVIATION...VFR. Mostly clear skies through Sunday. Hot temperatures
will bring high density altitudes. Reduced visibilities from smoke
near a prescribed fire in SW Idaho. Surface winds: variable 10 kt or
less becoming W-SW 10-20 kt with gusts to 30 kt after Sun/18Z,
strongest in the higher terrain. Winds aloft at 10kft MSL: W-SW 15-
25 kt.

KBOI...VFR. Mostly clear skies. Hot temperatures will bring high
density altitudes. Surface winds: SE 5-10 kt this evening, becoming
variable 10 kt or less after Sun/09Z, then N-NW 5-10 kt after
Sun/15Z.

&&

.PREV DISCUSSION...
SHORT TERM...Tonight through Monday night...Southwest flow
continues to strengthen over the region today with mostly clear
skies. This flow will bring breezy conditions this afternoon
(gusts 15-25 mph), and Sunday afternoon with gusts of 20-35 mph.
Today will be the warmest day of the year so far with some
places exceeding 100F in the lower valleys. Temperatures will be
around 15 degrees above normal today and on Sunday. The record
high at Boise is 104F today, and 103F on Sunday. Most places are
around a 10-20 percent chance of exceeding record highs on
Saturday and Sunday. Slightly cooler temperatures on Monday as a
system passes by to the north, enhancing the winds again.
Temperatures lower around 10 degrees on Monday, but still around
10 degrees above normal.

LONG TERM...Tuesday through Saturday...Southwest flow returns
on Tuesday with warmer temperatures through Wednesday. Lowest
valleys will be near 100F again on Wednesday. Then an upper
level trough approaches the Pacific NW on Wednesday into
Thursday. As this system approaches, some monsoonal moisture may
move northward into the area, introducing a slight chance of
thunderstorms on Wednesday afternoon as a cold front moves
through. The trough will move across WA and southern BC and
Alberta Thursday through Saturday, bringing breezy conditions
and much cooler temperatures. Temperatures on Friday lower to
around 5 degrees below normal, or low 80s in the lowest
elevations.

&&

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

&&

$$

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DISCUSSION...JB
AVIATION.....ST
SHORT TERM...KA
LONG TERM....KA