Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
443 FXUS66 KSGX 021612 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 910 AM PDT Sun Jun 2 2024 .SYNOPSIS... A weak trough over the West Coast will keep a deep marine layer in place through Monday with pockets of early morning drizzle in some coastal and valley areas. Low clouds will retreat back to the coast each afternoon. High pressure building over the Southwest will bring warming to the valleys, mountains and deserts Wednesday and Thursday. Cooler next weekend with increasing onshore flow and a deeper marine layer. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... The marine layer depth was 3400 feet this morning, deep enough to fill the Cajon Pass and the western portion of the San Gorgonio Pass. Like yesterday, the marine layer was deep enough for pockets of light rain and drizzle, most widespread in Orange County and northern San Diego County. Here are a few sites that had measurable precipitation in Orange County: Aliso Canyon Wilderness Park.....0.05" San Joaquin Hills................0.04" Dana Point.......................0.02" Capistrano Beach.................0.01" Huntington Beach.................0.01" In San Diego County, Camp Pendleton, Fallbrook and Rainbow all picked up 0.01" Low clouds will gradually dissipate toward the coast today, perhaps clearing from some of the beaches for a couple hours later this afternoon. Scattered high clouds will drift over the mountains and deserts. Tonight a Catalina Eddy strengthening over the coastal waters will keep the marine layer deep enough for low clouds to spread back into the inland valleys tonight, and for areas of early morning drizzle in the coastal zones Monday. From Tuesday night through Thursday a 591 dm ridge builds over the eastern Great Basin. This ridge position will bring hotter days to the deserts where highs Wednesday and Thursday will range from 100- 105 in the high deserts and from 105-110 in the lower deserts. Mountain areas will also be warmer with highs from 80-90. The eastern portion of the Inland Empire will also feel some of this heat with highs from 90-95. Warming in the coastal areas and the western valleys will be tempered by the marine layer and the cooling onshore sea breeze. Coastal highs will range from the upper 60s at the coast to the upper 70s ten miles inland. On Thursday night and Friday the ridge over the Great Basin is forced east by a deepening closed low over northern Baja. This closed low, cut off from the jet stream, will slowly meander north-northeast across northern Baja Friday and Saturday. This trough will bring increasing mid and high clouds and perhaps isolated convection to SoCal, but that will be dependent on the ultimate track of the low. The marine layer will also be quite deep next weekend. && .AVIATION... 021530Z...Coast/Valleys...BKN-OVC low clouds with bases 1500-2500 ft MSL with tops to 3000 ft MSL have filled in over the coastal basin. VIS restrictions on higher terrain where clouds and terrain intersect. 40% chance of VIS restrictions 2-5SM in the eastern valleys including KSBD through 17Z. Expect clearing in the valleys 16Z-19Z and partial clearing near the coast 18Z-21Z. SCT-BKN clouds with bases 1500-2000 ft MSL linger near the coast through this afternoon. Low clouds will spread back inland after 02Z Mon, with similar bases. Mountains/Deserts...Clear skies with unrestricted VIS today. West winds gusting up to 40 kt will occur again 22Z Sun-10Z Mon from the mountain crests east through the desert slopes and into the deserts, including through/near San Gorgonio Pass. Gusts 25-30 kt near KPSP and KTRM. MOD UDDFS expected. && .MARINE... No hazardous marine conditions are expected through Thursday. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ PUBLIC...Moede AVIATION/MARINE...Adams