024 FXUS66 KSGX 252047 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 147 PM PDT Fri Jul 25 2025 .SYNOPSIS... A trough of low pressure will continue cooler than normal weather through the weekend. High pressure will have greater influence on the area from the east, leading to near average temperatures by next week. Elevated winds will continue this weekend across mountains and deserts, while the marine layer covers areas west of the mountains with low clouds each evening into the morning hours. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... A 580dm area of low pressure currently over the Bay Area, has brought cooling to the region. It`s late July and temperatures are only in the 80s across the Inland Empire and High Desert! The cool weather will stick around into the weekend as the low weakens and a broad trough moves over the West Coast. Saturday will be the coolest day over the next week with highs near 5 degrees below normal near the coast and lower deserts, closer to 10 to 15 degrees below normal elsewhere. Elevated winds will occur through this weekend in the mountain desert passes into the deserts. Confidence is moderate to high in seeing wind gusts over 40 MPH along Route 78 in San Diego County and Interstate 10 in the San Gorgonio Pass. Winds will be highest this afternoon and evening, with winds closer to 25-35 MPH this weekend. The marine layer will continue to deeper, with low clouds moving into areas west of the mountains each night/morning. The low will weaken and combine with the mean flow aloft by Sunday and Monday as a large area of low pressure moves closer to the Pacific Northwest. As this occurs, high pressure over the Southern Plains of Texas will expand westward into the Desert Southwest. This will bring a warming trend to our region by the early part of next week. By Tuesday into the latter part of next week, temperatures will plateau near average across the region. Widespread 90s will return to the Inland Empire/High Desert, near 110 degrees in the lower deserts, with 70s/80s for the mountains, coastal valleys and beaches. Ensemble models show the weak troughing pattern continuing into later next week keeping temperatures near normal. Model differences become more apparent by the following weekend, some showing higher pressure moving into the area which would lead to a slow warming trend. && .AVIATION... 252100Z....Coasts/Valleys...VFR conditions across the region this afternoon until low clouds based 1500-2000 ft redevelop after 00z Saturday at the coast. These clouds will spread quickly inland and into Orange County, between 03-05z eventually spreading into the Inland Empire by 07-10z Saturday. 65% probability for more than 1 hour of cigs at KONT and 55% for KSBD overnight. Areas of reduced visibility 4-6SM possible in the IE where clouds meet terrain and locally where there is BR/HZ. Clouds scatter out 15-18z to the coast. Mountains/Deserts...FEW high clouds AOA 10,000 ft MSL. VFR conditions through Saturday afternoon. && .MARINE... Northwest wind gusts 15-20 kts over the waters today, weaker onshore flow follows this weekend into next week. No hazardous marine conditions are expected through Tuesday. && .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...APR AVIATION/MARINE...Westerink