Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
909 FXUS66 KSGX 090948 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 248 AM PDT Wed Jul 9 2025 .SYNOPSIS... The heat for inland areas will peak today and Thursday with high temperatures 5 to 10 degrees above average. Not quite as hot for Friday into next week with the coast and valleys near to around 5 degrees below average with the deserts around 5 degrees above average. Patchy coastal low clouds for this morning will increase in coverage by the weekend and spread 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 (Today through Friday)... High temperatures will warm a few more degrees today with not much change for Thursday. High temperatures for today and Thursday will be a few degrees above average near the coast to 5 to 10 degrees above average for inland areas. High temperatures will range from the 70s near the coast to the 90s to 105 for the Inland Empire with 114 to 118 for the lower deserts. For Friday, high temperatures will be 4 to 8 degrees cooler than Thursday for the coast and valleys with the deserts a few degrees cooler. Friday high temperatures will range from the lower to mid 70s near the coast to the upper 80s to upper 90s for the Inland Empire with 110 to 114 for the lower deserts. The marine layer will be around 1500 feet deep into Thursday with patchy coverage of low clouds for early this morning increasing in coverage for late tonight into Thursday morning and for late Thursday night into Friday with the low clouds returning to portions of the western valleys. There will also be a few mid and high clouds today from thunderstorms well to the south across central Baja. && .LONG TERM (Saturday through Tuesday)... Not much change from Friday with high temperatures for the coast and valleys a few to around 5 degrees below average with the deserts around 5 degrees above average. Night and morning coastal low clouds will spread into the western valleys late each night. && .AVIATION... 090900Z....Coast...FEW-SCT high clouds above 15000 feet MSL. Patchy low clouds based 700-1000 feet MSL currently offshore may develop onshore, mainly at the coast of southern SD County between 11-15z. 60% for brief cigs at KSAN, 35% for KSNA and 20% for KCRQ. Scatter out of any cigs by 16Z. Slightly more extensive low clouds with similar bases to develop at the coast after 08Z Thu. Valleys/Mountains/Deserts...VFR conditions with FEW-SCT thin high clouds above 15000 feet MSL through early Thu. && .MARINE... Northwest wind gusts around 20 kts near San Clemente Island Wednesday afternoon and evening. Otherwise, no hazardous marine weather is expected through Sunday. && .SKYWARN... Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...Heat Advisory from 10 AM this morning to 8 PM PDT Thursday for Riverside County Mountains-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Mountains- San Diego County Valleys. Extreme Heat Warning from 10 AM this morning to 8 PM PDT Thursday for Coachella Valley-San Diego County Deserts-San Gorgonio Pass near Banning. PZ...None. && $$ PUBLIC...17 AVIATION/MARINE...Westerink