FXUS66 KSGX 262040

AFDSGX



Area Forecast Discussion

National Weather Service San Diego CA

140 PM 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 have cleared off the Orange County beaches this

afternoon, but remain stuck at the San Diego County Beaches.

Elsewhere skies were mostly clear aside from smoke from a wildfire

in Mexico across far southeastern San Diego County. High

temperatures for most areas are running around 2-5 degrees higher

than this time yesterday, with the low deserts being an exception

thanks to southeasterly flow and higher dewpoints keeping 

temperatures similar to yesterday. 



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... 

262100....Coast/Valleys...SCT-BKN low clouds based 1000-1500ft MSL 

are forming along the immediate coastline. This layer will push 

inland again tonight generally after 03z Fri with bases lowering to 

800-1200ft MSL. Clouds will initially only make it 15-20 miles 

inland, though they could sneak into western portions of the IE 

between 10-12z Fri. Chance for CIG's overnight have increased to 60% 

chance at KONT. VIS reductions 2-5SM for western inland valleys, 

western IE and higher coastal terrain. Locally lower VIS possible 

between 09-13z. Clearing to the coast 15-18z.



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

Friday afternoon.



&&



.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

