704 FXUS66 KSGX 082144 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 144 PM PST Mon Dec 8 2025 .SYNOPSIS... Warm and dry conditions with periods of Santa Ana winds expected this week. The peak of the heat is expected Tuesday and Wednesday. Mostly clear skies will prevail through Friday, with low clouds and fog returning to coastal areas as early as Saturday morning. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Peak wind gusts so far today have mostly been 40-45 mph. The only exceptions have been at Lytle Creek Ridge, which gusted to 47 mph and Devil Canyon which gusted to 46 mph. A peak wind gust summary has been headlined on our weather.gov/sandiego homepage. The surface high pressure over the Great Basin will remain in place through Friday, continuing periods of weak to locally moderate Santa Ana winds. Strongest winds will remain confined to coastal mountain slopes, foothills, and below passes into Tuesday morning with gusts 25-45 mph. Weaker winds are expected on Wednesday and Thursday with a bump up in winds possible Friday, although those winds have begun to trend weaker. The airmass getting pushed into Southern California from the Great Basin will be dry, with minimum afternoon relative humidity for inland areas falling to 10 to 20% each afternoon through Friday, bringing periods of elevated fire weather conditions. An upper level ridge over the East Pacific will remain over the US West Coast, bringing an increase in high temperatures. High temperatures on Tuesday will be 15 to 20 degrees above average. Widespread highs in the low to mid 80s are forecast across the inland coastal areas into the valleys as well as the low deserts. Weaker Santa Ana winds and a weakening in the upper level ridge will allow for minor cooling for the coast on Wednesday with further cooling into the valleys on Thursday but highs will remain 10 to 20 degrees above average. Nights and mornings will remain cool, especially in the wind-sheltered areas, minimizing any heat impacts. Further cooling is expected into the weekend as weak onshore flow returns, but temperatures will continue to run above average. Low clouds and fog are not expected to impact land areas through much of this week due to persistent offshore flow. The pressure gradient will switch onshore this weekend with chances of low clouds and fog developing at the coast and western valleys as early as Saturday. && .AVIATION... 082130Z...Clear and VFR conditions will prevail through Tuesday afternoon. Pockets of northeast winds gusting 25-35 kts mainly in foothills and adjacent valleys through Tuesday. && .MARINE... Tonight, 30-40% chance for patchy fog development over the marine waters after 7 PM. Otherwise, no hazardous marine conditions are anticipated 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...CO AVIATION/MARINE...Westerink
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