Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
271 FXUS66 KSGX 120400 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 900 PM PDT Tue Jun 11 2024 .SYNOPSIS... Night and morning low clouds will continue west of the mountains through the rest of the work week. Warmer across the coast and valleys on Wednesday with slight cooling on Thursday. Briefly warmer on Friday and Saturday before cooler conditions develop by Sunday. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .Evening Update... Quite the minuscule temperature change was found near the coast from early this morning into the afternoon, where some cities only saw a 1 to 3 degree difference so far today. Low clouds continue to push further inland this evening, reaching locally into the Inland Empire by the morning hours. Slightly warmer weather will occur by tomorrow across the region with better clearing at the coast. The main story for the week will be the weekend heat across the Coachella Valley and Anza Borrego Desert with high temperatures nearing 10 degrees above normal. Otherwise, no forecast changes this evening. Previous Discussion (136 PM Tuesday)... A 581 DM low is about 350 miles southwest of San Diego this afternoon, and a ridge is building across the Great Basin. Thick low clouds remain across the coast and western valleys, and only marginal additional clearing is likely today. This will keep the coast and western valleys a few degrees shy of seasonal averages, but slow warming will continue across the mountains and deserts, and highs will run 5-10 degrees above normal in those areas. The upper low will continue to churn to our southwest over the coming days while a ridge builds over the Four Corners region. Night and morning low clouds, and patchy drizzle tomorrow morning, will continue each day through the end of the work week, with the inland extent varying slightly each day. Highs will warm a few degrees on Wednesday across the coast, valleys and lower deserts, but will cool slightly in the mountains and High Desert. The low weakens and becomes an open wave on Thursday, passing over Southern California into Friday. Gusty winds will occur over the mountains and desert slopes on Thursday, and highs will cool a degree or two region-wide. A transient ridge develops for Friday and Saturday resulting in noticeable warming as well as a more shallow marine layer. This will be short-lived, however, as longwave troughing envelopes the western United States. A cooling trend will then occur Sunday through early next week. && .AVIATION... 120350Z...Coast/Valleys. OVC006-012 tops 022 spreading 20-25 miles inland through 15Z with areas vis 2-4SM in FG/HZ. Patchy light rain and drizzle 10Z-16Z. Clearing in the valleys 16Z-19Z but CIGS lingering near the coast through 24Z. Mountains/Deserts...SCT250 and unrestricted VIS through Wed. && .MARINE... No hazardous marine conditions are expected through Saturday. && .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/EA AVIATION/MARINE...Moede