238 FXUS66 KSGX 131620 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 920 AM PDT Fri Jun 13 2025 .SYNOPSIS... Temperatures expected to fluctuate between periods of warming and cooling into next week. Overall, temperatures will stay 5 to 10 degrees above average at their warmest and around 5 degrees above average at their coolest. Night and morning low clouds and fog can be expected each day and will reach into portions of the valleys. Slight increase in westerly winds expected over the mountains and into the deserts early in the upcoming week. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Visible satellite at 9 AM was showing areas of low clouds clearing from the valleys. Low confidence in complete clearing at the beaches this afternoon, with partial and intermittent clearing most likely. Low clouds and fog are expected to remain persistent each night and morning for the coast and into portions of the valleys into next week. High pressure will build from the south this weekend bringing an increase in high temperatures, peaking on Sunday. Highs today will be a few degrees warmer for the coast and valleys with not much change for the deserts. By Sunday, high temperatures will be around 5 degrees above average near the coast and 10 degrees above average further inland. NBM chances for the low desert to exceed 115 degrees on Sunday is less than 10 percent, with an over 90 percent chance of high exceeding 110 degrees. West of the mountains, there is a 50 to 80 percent chance of portions of the Inland Empire exceeding 100 degrees and a 30 to 50 percent chance of the eastern San Diego County valleys exceeding 100 degrees Sunday. A low pressure system moving inland through California on Monday will strengthen onshore flow for Monday and Tuesday. This will result in a slight increase in westerly winds over the mountains and into the deserts. In addition, slight cooling will spread inland on Monday and Tuesday. By Tuesday high temperatures will be around 5 degrees above average. Wednesday will see a few degrees of warming as the ridge rebounds in the wake of the passing trough with cooler conditions expected Thursday and Friday as a stronger, deeper trough digs into the Pacific Northwest. && .AVIATION... 131530Z....Coast/Valleys...Low clouds based around 1200-1700 feet MSL and tops to 2500 feet, with vis reduced 0-5SM between these levels, present along coast. Clouds continue clearing through 17Z inland and 17-19Z for the coast, but only brief or partial clearing at the immediate coast. Low clouds will begin their move inland after 00Z and locally into inland valleys by early Saturday. Bases/vis will be slightly lower, with less inland coverage than this morning. Clearing Saturday morning 15-16Z inland and 17-19Z for the coast, with some patchy low clouds lingering along the immediate coast but better overall clearing than today. Otherwise...SCT high clouds and unrestricted vis today and tonight. && .MARINE... No hazardous marine conditions are expected today through Tuesday. && .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...CSP