670 FXUS66 KSGX 112011 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 111 PM PDT Wed Jun 11 2025 .SYNOPSIS... Benign weather will through into the end of the week with a sizable marine layer. High pressure will expand over the desert southwest by Sunday, leading to slight warming for inland areas. A weak troughing pattern will take hold by early next week, where highs will be closer to average. Dry weather continues for the foreseeable future. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM... Minor day to day changes will occur through Saturday as high pressure is kept to the south by a trough that persists along the coast of the Pacific Northwest. The marine layer will maintain its depth over the next few days with clouds overnight into the morning across the valleys, with less clear conditions at the coast. Patchy fog will occur mainly across the valleys and elevated coastal terrain. NBM was used for the forecast with highs in the 90s and lower 100s across the Inland Empire and desert regions. High pressure to our south will expand further across the southwestern part of the country by the weekend. This will lead to warmer temperatures away from the coast, where highs will go around 5 to 10 degrees above average. High temperatures will likely go over 110 degrees across parts of the lower deserts by Sunday with a 5-25% chance of highs going above 115 degrees across the Coachella Valley. Confidence is low to moderate in seeing temperatures approach 100 degrees across parts of the Inland Empire as well as highs in the lower 90s for other western valleys. Rising heights will also allow the marine layer to be suppressed some, so chances for low clouds in the western valleys will lower. A subtle troughing pattern will take hold by early next week, though models do struggle a bit with how deep this will be. The deeper the trough, the greater the cooling and deeper marine layer. For now, the NBM forecast has been used to show a slow cooling pattern by early next week with continued dry weather. && .AVIATION... 102015Z....Coast/Valleys...Low clouds based 1400-1700 feet MSL with tops to 2100 feet are lingering along the immediate coast in San Diego County, but conditions are otherwise mostly clear. There is a 40% chance that KSAN/KCRQ will remain BKN-OVC all day, with a 60% chance for SCT 21-00Z. Low clouds will begin to move inland again after 00Z today, lowering to 700-1100 ft MSL with reduced vis 0-5 SM inland and over higher coastal terrain between these levels. Inland areas scatter out again 16-17Z Thu, 18-20Z for coastal areas, with only intermittent clearing along the immediate coast again. 20% chance for KCRQ and KSAN to remain BKN-OVC through the day Thu. Mountains/Deserts...SCT high clouds and unrestricted vis today and tonight. && .MARINE... No hazardous marine conditions are expected today through Monday. && .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...CP