Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
261 FXUS66 KSGX 030505 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 905 PM PST Sun Nov 2 2025 .SYNOPSIS... A trough of low pressure will deepen offshore through the middle of the week, bringing cooler weather, breezier conditions, and greater coverage of low clouds west of the mountains. High pressure will reemerge at the end of the week, bringing in warmer conditions and cloud coverage closer to the coast. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Satellite imagery at 9 PM was showing widespread high cloud coverage moving west to east across the region. Observations from area airports are indicating patches of low clouds had developed along portions of the coast. Low clouds and areas of fog are expected to become more widespread overnight, potentially reaching into the western portions of the Inland Empire. From previous discussion issued at 2 PM November 2... A Pacific storm over the Aleutian Island Chain of Alaska will move closer to the West Coast over the next couple days. This will lead to pressure height falls, aiding in minor cooling and greater onshore flow across Southern California in the coming days. High temperatures will be similar most places by Monday and Tuesday, with the inland valleys seeing the greatest cooling around 5 degrees with widespread highs in the lower 80s. The marine layer will slowly deepen over the next couple of days as well, with a greater chance of fog for areas of the Inland Empire. The Pacific storm and associated area of low pressure will move into Northern California and Oregon by Wednesday and Thursday. This will bring the greatest cooling and west winds over the region. Highs in the 60s/70s will be common for most areas with the Coachella Valley in the 80s. We still continue to monitor winds during this time, but confidence is increasing on wind speeds becoming elevated across the mountains and deserts with gusts 20-40 MPH out of the west. Model agreement is fairly uniform in bringing in an expanding area of high pressure by Friday into next weekend across the region, which will contribute to warmer weather and weaker winds with offshore flow. && .AVIATION... 030330Z...Coasts/Valleys...While SCT-BKN high cirrus clouds are partially obscuring satellite detection of low clouds, they are starting to reform across the California Bight and along portions of the coast. Bases are about 700-900ft MSL with CIGs currently stretching from a few miles south of KSNA southward through KCRQ. Expecting CIGs to continue to fill in along the coast and inland about 15-20 miles over the next several hours. By 06-09z, bases will settle to 500-800ft MSL, brining VIS down to 1SM or less at times for coastal higher terrain and inland valleys while the immediate coasts will see VIS restrictions to 4-6 miles. There is a 50-60% chance for CIGs and very low VIS at KONT between 12-16z Monday. Clouds and BR/FG should clear back towards the coast around 18z Monday. Low clouds look to redevelop and push back ashore after 03z Tuesday, with bases initially around 900-1200ft MSL. Mountains/Deserts...VFR conditions prevail through the period. FEW- SCT high clouds AOA 20,000ft MSL through Monday evening. && .MARINE... No hazardous marine concerns through Thursday. && .BEACHES... Long period (19-21 sec) swell from the southwest (200 degrees) prevailing through today, bringing elevated surf of 3 to 5 feet with locally higher sets on southwest facing beaches. Surf will gradually fall tonight into Monday. Surf becomes elevated again late week. && .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...CO/APR AVIATION/MARINE/BEACHES...Munyan