Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
708 FXUS66 KSGX 052144 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 144 PM PST Fri Dec 5 2025 .SYNOPSIS... Weaker winds will occur across the region for the weekend with tranquil weather expected. Patchy dense fog may occur near the coast by Sunday and Monday mornings. High pressure will strengthen over the area into next week, bringing warmer temperatures and increasing winds. Santa Ana winds will strenghten across the region by Monday and Tuesday with weak to locally moderate strength expected. The area of high pressure looks to stick around into the end of the week, keeping our weather pattern warm and dry as we move into the middle of the month. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Offshore flow continues to weaken over the region this afternoon with wind gusts in the foothills/passes seeing gusts near 15-25 MPH. The pressure gradient will relax and turn subtly onshore by Saturday, leading to similar temperatures to those of today. This slow onshore push will deepen the marine layer slightly, leading to a better chance of fog near the coast by Saturday night into Sunday morning. Some of the fog may be dense (near 1/4 - 1/2 mile visibility at times), which may impact airport travel. An area of high pressure currently off the coast, will begin to expand over our region by Sunday into early next week. Due to this, Sunday will be the beginning of a warming trend across Southern California. The greatest warming will be felt of the lower deserts and valleys west of the mountains with highs reaching into the upper 70s. The high expands further eastward over the area by Monday. Models seem to have less of a handle on any fog development on this day, but the chance still remains whether the marine layer will be deep enough for another day of dense fog. Offshore flow will strengthen on Monday into Tuesday. Confidence has increased slightly from previous forecast, with a weak to locally moderate event becoming increasingly likely. Winds were nudged up some across the region during this time to reflect this increasing confidence in widespread wind gusts near 25-35 MPH, locally near 45 MPH in the mountains. Wind speeds and overall direction will become more clear in the coming days as we continue to forecast the exact placement of the area of high pressure near the region. NBM chances for high temperatures over 85 degrees increase near 20-50% by Tuesday through Friday of next week. There is higher confidence that many valley west of the mountains and lower deserts to see highs in the 80s, which would be 10-15 degrees above normal. Weak offshore flow will prevail during this period as well. The offshore pattern and the high`s position over the area will give a more detailed temperature forecast in the coming days. Low temperatures will also be above average, so not as chilly out there as well. The area of high pressure looks to stick around through much of the work week next week, with slight diversions on its strength and location by next weekend. Whatever the exact outcome, expect warm and dry weather as we go into the middle of the month. && .AVIATION... 052100Z....Mostly clear skies and VFR conditions are expected through Sat afternoon. && .MARINE... No hazardous marine conditions are expected through Wednesday. && .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...Westerink