386 FXUS66 KSGX 131825 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 1125 AM PDT Wed May 13 2026 .SYNOPSIS... Brief warming trend expected through Friday, with cooler conditions over the weekend, and potential for additional warming early next week. Night and morning low clouds and fog will be present each day through the forecast period along the coast and into portions of the valleys. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Visible satellite at 11 AM was showing low clouds clearing from the valleys to the coast. Low clouds may linger along the immediate coast into the late afternoon. The marine layer will gradually become shallower for Thursday and Friday, with overnight low clouds not reaching as far inland. Low clouds should clear most locations by late morning, with the coast having the highest potential for low clouds lingering into the afternoon. The marine layer will become deeper for Friday into the weekend as a broad trough of low pressure digs into the Pacific Northwest. High temperatures will warm a few degrees each day through Friday, most noticeable to for the deserts. Highs in the deserts will be 5 to 10 degrees above average, with highs west of the mountains within 5 degrees of average. As the aforementioned low digs south, winds will increase over the mountains and deserts. Winds will peak in strength Saturday into Sunday with the trough passage. Additionally temperatures will fall a few degrees, becoming slightly below normal for most locations. Temperatures are expected to warm for early to mid-next week. Most ensemble clusters indicate a ridge of high pressure in the vicinity of the US West Coast with variations in placement. A more easterly position (putting the ridge over California) would lead to a warmer solution with a more westerly position (keeping the ridge over the Eastern Pacific) would keep temperatures more moderate. && .AVIATION... 131800Z...Coast/Valleys...Low clouds have risen mostly above 3000 ft MSL this morning. Clouds are currently clearing toward the coast, but some patches may stick to the coastline through the afternoon. Bases will begin to lower again this evening and push ashore and inland after 01z vcnty KSAN and after 08z vcnty KSNA. Bases should hover around 1500-2000 ft MSL overnight with clouds filling most of the coastal basin by 12z, though parts of the Inland Empire may struggle to fill in. 60% chance for BKN cigs for KONT and KSBD. Clouds scatter to the coast 16-18z Thu. Mountains/Deserts...SCT cumulus based AOA 10 kft over ridgetops through 00z with SKC otherwise. Westerly wind gusts 25-40 kt after 20z along desert slopes and into deserts. Gusts locally to 50 kts through the Banning Pass. MOD up/downdrafts and local LLWS in lee of mountains. && .MARINE... No hazardous marine conditions are expected through Saturday morning. Increasing winds and seas over the outer coastal waters could become hazardous for small craft Saturday afternoon through Sunday. && .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 AVIATION/MARINE...KW
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