344
FXUS66 KSGX 031627
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
927 AM PDT Thu Jul 3 2025

.SYNOPSIS...
Today will be slightly cooler than Wednesday, then warmer for
Friday and Saturday, little or no warming for Sunday and Monday,
then additional warming for Tuesday and Wednesday with high
temperatures on Wednesday of next week 5 to 10 degrees above
average for inland areas. The marine layer will become shallower
for the weekend into next week with night and morning coastal low
clouds spreading into portions of the western valleys late each
night.

&&

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

.Morning Update...

Low clouds continue to erode out of the western valleys this
morning with mostly clear conditions expected along the beaches
by the afternoon. High pressure will have a greater influence on
the region by the Independence Day holiday into the weekend, so we
can expect high temperatures to be a few degrees warmer than
today. Moderate to high heat risk is expected to occur by the
middle of next week for inland valleys, mountains and deserts.
Those with heat sensitivities or without proper cooling methods
should continue to monitor the forecast.

.Previous Discussion (255 AM Thursday)...

.SHORT TERM (Today through Saturday)...
A low pressure system over southern California early this morning
will weaken as it moves into Arizona today with a faster-moving
low pressure system to the north moving inland through northern
and central California tonight with weakening low pressure across
California on Saturday.

High temperatures today will be slightly cooler followed by
warming on Friday and Saturday with Saturday high temperatures
around average at lower elevations and around 5 degrees below
average for mountain elevations above 6000 feet.

A marine layer near 2000 to 2500 feet this morning with coastal
low clouds spreading into portions of the Inland Empire will
become gradually shallower for Friday and Saturday with night and
morning coastal low clouds not spreading as far into the valleys.

&&

.LONG TERM (Sunday through Wednesday)...
Not much change in high temperatures or slight warming for inland
areas on Sunday and Monday with high pressure over the interior
southwest states, low pressure off the northern California coast,
with generally dry south to southwest flow aloft over southern
California. Some shallow lower level monsoonal moisture could
begin to spread into the lower deserts next week with warmer
nights for the lower deserts and with some afternoon clouds along
the desert slopes of the mountains for the middle of next week.

High pressure aloft to the east will strengthen and expand for the
middle of next week, though with some model differences with the
placement. This will bring additional warming on Tuesday and
Wednesday with high temperatures on Wednesday 5 to 10 degrees
above average for inland areas. High temperatures on Wednesday
will range from the lower to mid 70s near the coast to the mid 90s
to 105 for the Inland Empire with 112 to 116 for the lower
deserts.

&&

.AVIATION...
031600Z....Coast/Valleys...Satellite shows low clouds quickly
burning off across inland areas and western valleys. Clouds with
bases ranging 1300-1600ft MSL will clear to the coast by 17-18z.
Patchy low clouds may hang along the beaches with a 30-40% chance SD
County beaches and nearshore waters remain BKN through the
afternoon. Low clouds based 900-1400ft MSL push inland again after
02Z Fri. Similar to slightly less inland extent with clouds reaching
into the far western and southern IE. Localized VIS reductions down
to 1-3SM for coastal mesas and valleys. Clouds to clear to the
beaches by 16-17z Fri.

Mountains/Deserts...Mostly clear with unrestricted VIS through
Friday morning.

&&

.MARINE...
No hazardous marine weather conditions are expected through Tuesday.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through Saturday evening for Orange
     County Coastal Areas-San Diego County Coastal Areas.

PZ...None.

&&

$$

PUBLIC...APR
AVIATION/MARINE...Zuber