990
FXUS66 KSGX 061626
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
926 AM PDT Thu Jun 6 2024

.SYNOPSIS...
The heat will peak for the deserts today while the Inland Empire
cools slightly. Slow cooling will spread inland for Friday
through Sunday with Sunday high temperatures still a few degrees
above average for the deserts. Warmer for Monday and Tuesday of
next week, then slow cooling for Wednesday through Friday. The
marine layer will keep coastal areas cooler with night and
morning coastal low clouds spreading a little farther into the
valleys over the weekend.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

The 12z Miramar sounding showed a 12C degree inversion based near
1200 feet. Low clouds cover the coast and western valleys this
morning, but are starting to retreat towards the coast. The
strength of the inversion may prohibit clearing at the coast, but
a few peeks of sunshine will be possible this afternoon.

A 593 DM high is centered over the Southern High Plains today and
a 585 DM low is off the coast of southern Baja California. Hot
conditions will continue across inland areas, with highs topping
out 8-15 degrees above normal in the mountains and deserts, and
near, to up to 5 degrees above normal across the coast and
valleys. Moderate to high heat risk remains in the deserts as
highs top out around 109-112 in the lower deserts, and 100-105 in
the High Desert. A few degrees of cooling will reach the mountains
and deserts tomorrow.

Previous Discussion (Issued 310 AM PDT Thu Jun 6 2024)...
.SHORT TERM (Today through Saturday)...
The heat will peak for the deserts today while the Inland Empire
cools slightly. Highest temperatures today of around 112 for the
lower deserts and 105 for the Apple and Lucerne Valleys are
expected. While that`s around 10 degrees above average for the
lower deserts and 10 to 15 degrees above average for the Apple and
Lucerne Valleys, the high temperatures for the deserts today are
not expected to be record setting. Slow cooling will spread inland
for Friday and Saturday with Saturday high temperatures around 5
degrees above average for the deserts.

The marine layer is near 1500 to 2000 feet deep early this
morning with coastal low clouds extending inland into the western
valleys. The marine layer will slowly deepen for Friday into the
weekend with night and morning coastal low clouds extending
farther inland into the valleys.

&&

.LONG TERM (Sunday through Wednesday)...
Slow cooling will continue to spread inland on Sunday with Sunday
high temperatures still a few degrees above average for the
deserts and a few to around 5 degrees below average for the coast
and valleys. Warming is expected for Monday and Tuesday with
Tuesday high temperatures for the deserts around 4 to 8 degrees
above average with the coast and valleys within a few degrees of
average. Night and morning coastal low clouds won`t extend quite
as far into the valleys for Monday and Tuesday. Wednesday is
expected to be slightly cooler.

&&

.AVIATION...
061625Z...Coast and western valleys...Low clouds with bases 600-1000
feet MSL with tops to 2000 feet. Local vis reduced 1-5SM over higher
coastal terrain and valleys. Clearing inland is in progress at this
hour. Inland clearing should complete by 19Z but only partial
clearing is likely at the coast, with SCT-BKN clouds persisting into
the afternoon. Low clouds with similar bases/tops/vis and coverage
will push inland after 23Z and expand into western valleys overnight
into Friday morning.

Otherwise...clear skies today and tonight.

&&

.MARINE...
No hazardous marine conditions are expected through Monday.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory until 9 PM PDT Friday for San Bernardino and
     Riverside County Valleys-The Inland Empire.

     Excessive Heat Warning until 9 PM PDT Friday for Apple and
     Lucerne Valleys-Coachella Valley-San Diego County Deserts-
     San Gorgonio Pass Near Banning.

PZ...None.

&&

$$

PUBLIC...EA/17
AVIATION/MARINE...PG