Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
673 FXUS66 KSGX 161020 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 320 AM PDT Mon Jun 16 2025 .SYNOPSIS... There will be slow cooling through Wednesday with high temperatures cooling from 10 to 15 degrees above average for the deserts today to 5 to 10 degrees above average for inland areas on Wednesday. The cooling will continue into next weekend with weekend high temperatures around 5 degrees below average for inland areas. There will be locally dense fog this morning near the mesas and other higher coastal terrain. The marine layer will slowly deepen for Wednesday into next weekend with with night and morning coastal low clouds spreading farther into the valleys by next weekend. Breezy west winds will continue across the mountains and deserts each afternoon and evening, strongest today. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM (Today through Wednesday)... Not much change in high temperatures is expected for today with high temperatures ranging from around 5 degrees above average near the coast to 10 to 15 degrees above average for the deserts. High temperatures for today will range from the lower to mid 70s near the coast to the mid 90s to 103 for the Inland Empire with 112 to 117 for the lower deserts. This will be followed by gradual cooling spreading inland on Tuesday and Wednesday with Wednesday high temperatures a few degrees above average near the coast to 5 to 10 degrees above average for inland areas. The marine layer is around 1000 feet deep early this morning with locally dense fog near the mesas and other higher coastal terrain. The marine layer will begin to slowly deepen by Wednesday with night and morning coastal low clouds returning to the far western valleys. && .LONG TERM (Thursday through Sunday)... Low pressure centered near the West Coast will bring stronger onshore flow and weaken high pressure aloft over southern California. This will continue the cooling trend into next weekend with high temperatures around average near the coast to a few to around 5 degrees below average for the valleys, mountains, and deserts. High temperatures for next weekend will range from the lower 70s near the coast to the 80s to around 90 for the Inland Empire with 100 to 105 for the lower deserts. The marine layer will deepen to around 1500 to 2000 feet by next weekend with night and morning coastal low clouds spreading farther into the valleys. && .AVIATION... 160930Z....Coast/Valleys...Low clouds have filled in about 5-10 miles inland across San Diego County this morning, and have been spreading through coastal Orange County as well. These clouds are currently based around 400-600ft MSL but could settle to 200-300ft MSL by 12-14z this morning. VIS restrictions down to 0-3 SM for coastal mesas and other areas within the cloud layer, with 1-4 SM expected for the immediate coasts and beaches. Clouds/fog quickly scatter out to the beaches 16-17z later this morning, with full clearing expected by 18z. Low clouds with similar bases, VIS, and coverage to this morning expected to develop again after 06z Tuesday. .Mountains/Deserts...Clear skies and mostly unrestricted VIS prevail through Monday. West winds strengthening after 18z Mon, with wind gusts 20-30 kts, locally near 40 kts through the San Gorgonio Pass, leading to MOD UDDFS 21z Mon-08Z Tue. && .MARINE... Wind gusts up to 20-25 kts possible in the outer waters Monday afternoon near San Clemente Island. Otherwise, no hazardous marine conditions are expected through Thursday. && .BEACHES... The long period southerly swell continues to wane this morning. While 3-5 feet remains possible today across Orange County and north San Diego County beaches, the Beach Hazard Statement was allowed to expire. && .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/BEACHES...Munyan