703 FXUS66 KSGX 260932 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 232 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 Monday and Tuesday. For the coast and valleys, high temperatures on the warmest day on Saturday will be near to around 5 degrees above average with the warmer days for the deserts around 5 degrees above average. 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... .SHORT TERM (Thursday through Saturday)... High pressure to the south will continue the slow warming trend into Saturday for the coast and valleys and into the deserts into Monday and Tuesday. With the warming, Saturday high temperatures will be near to around 5 degrees above average for the coast and valleys with the deserts a few to around 5 degrees above average. High temperatures on Saturday will range from the lower 70s near the coast to the upper 80s to mid 90s with 106 to 112 for the lower deserts. A marine layer near 2000 feet deep this morning will decrease to 1500 to 2000 feet deep for Friday into next week with night and morning coastal low clouds spreading into the western valleys late each night. && .LONG TERM (Sunday through Tuesday)... 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... 260900....Coast/Valleys...Low clouds based 1200-1500ft MSL with tops to 2000ft have filled into the coastal and valley areas, with some patchiness reaching the Inland Empire. Slight further inland spread through 12z with a 70% chance for a CIG at KONT beginning around 11z. Sporadic VIS restrictions down to 3SM, 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. .Mountains/Deserts...Clear skies with unrestricted VIS through Thursday evening. && .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...17 AVIATION/MARINE...Zuber