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Forecast Discussion for San Diego, CA
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322 FXUS66 KSGX 230415 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 915 PM PDT Thu May 22 2025 .SYNOPSIS... Cooler with a deepening marine layer Friday into the weekend. There will periods of stronger and gusty southwest to west winds for the mountains and deserts during the afternoons and evenings through Sunday. Areas of night and morning marine layer clouds continue into the middle of next week with highs near seasonal normals. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Evening update... Areas of low clouds are lingering along the immediate coast this evening. The 00Z KNKX sounding has a marine inversion based near 1900 ft MSL, around 700 ft higher than this morning. With a deeper marine layer in place, expect little to no dense fog tonight into Friday morning except where the marine layer intersects terrain in the valleys. Otherwise breezy west winds gusting to 30-40 mph below the passes will weaken overnight. Friday will be cooler with highs around 3-6 degrees above normal. Slightly stronger west winds will occur in the mountains and deserts Friday afternoon and evening with gusts to around 55 mph below the passes. Previous discussion... Winds will continue to diminish going into the early hours on Sunday as the trough continues to pull away from the region. There will be an overall area of troughing over the northwestern region, and possibly a weak upper level low transitioning over California during the early part of next week, which could help to reinforce some cooler temperatures and allow for a slight chance of precipitation. Otherwise, generally it will remain cooler and more moist with a persistent onshore flow in place through the middle of next week. && .AVIATION... 230330Z...Coast...Low clouds based at 800-1400 feet MSL have moved offshore this evening; are expected to return 05-07z tonight for coastal areas and valleys 15-20 miles inland. Local VIS reductions 1- 3 SM for higher coastal slopes and inland valleys; highest confidence between 09-14z. 40% chance CIGs reach KONT and 20% at KSBD. Clearing Friday morning around 17-18z. Low clouds return Friday evening, 00-02z, with higher bases 1500-2000 feet MSL. Elsewhere...Clear with unrestricted VIS through Friday morning. Strong west winds over mountains, passes and desert slopes with gusts locally to 35-50 kts Friday afternoon. && .MARINE... Winds gusting near 20 kts near San Clemente Island on Friday afternoon, otherwise, 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...Wind Advisory from 5 PM Friday to 3 AM PDT Saturday for San Gorgonio Pass near Banning. PZ...None. && $$ PUBLIC...SS/Stewey AVIATION/MARINE...Westerink |
Previous Forecast Discussions may be found at
NWS San Diego, CA (SGX) Office Forecast Discussions.
(Click 'Previous Version' there to view past versions successively.
Some may differ only in time posted.)
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