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

