Alpine, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

314
FXUS66 KSGX 261600
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
900 AM PDT Thu Jun 26 2025

.SYNOPSIS...
For the coast and valleys, slow warming will continue into
Saturday followed by slow cooling into Tuesday. For the deserts,
slow warming will continue into Tuesday. Highs on the warmest days
will be around 5 degrees above normal. The marine layer will
mostly fluctuate between 1500 and 2000 feet deep with night and
morning coastal low clouds spreading into the western valleys late
each night.

&&

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

Low clouds in the inland valleys are beginning to erode, with thin
high clouds elsewhere. Expect only partial clearing along the
coast this afternoon given there was a 10C inversion in place on
the 12Z sounding and the stratus deck is close to 1000 ft thick in
spots. The weak upper level trough overhead will shift eastward
today, allowing for warming inland. In general highs will be near
to around 5 degrees below normal.

Upper level high pressure will gradually build in from the
southeast through Saturday, continuing the warming trend for all
areas. By Saturday, high temperatures will be near to about 5
degrees above normal across the region. The marine layer will
become more shallow, with low clouds becoming confined to the
coastal areas and western valleys each night and morning.
Ensembles are showing some increase in mid-level moisture Saturday
afternoon and Sunday as the upper high becomes centered near the
Four Corners, but at this time it only looks like enough for some
cumulus development over the mountains each afternoon.

A weak upper level low pressure system off the California coast on
Saturday will move slowly eastward to a position along the
California coast on Tuesday. This will bring slight cooling to the
coast and valleys for Sunday through Tuesday while the deserts
continue to slowly warm through Monday with not much change
for Tuesday. For Tuesday, high temperatures will range from the
lower 70s near the coast to the mid 80s to mid 90s for the Inland
Empire with 108 to 112 for the lower deserts.

&&

.AVIATION...
261500....Coast/Valleys...Low clouds based 1200-1500ft MSL with tops
to 2000ft through most of coastal basin. Sporadic VIS restrictions
down to 1SM, primarily for inland areas, through 17z. Clearing
likely to occur to the immediate coast by 17-18z, possibly lingering
along the beaches through 20-21z. 40% of clouds not clearing the San
Diego County beaches at all. Low clouds push inland again tonight
generally after 03z Friday with lower bases closer to 800-1200ft
MSL. With lower bases, clouds will only make it 15-20 miles inland.
Only 20% chance for CIG`s at KONT tonight.

.Mountains/Deserts...Clear skies with unrestricted VIS through
Friday morning.

&&

.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...None.
PZ...None.

&&

$$

PUBLIC...SS
AVIATION/MARINE...Westerink