Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
062 FXUS66 KSGX 260946 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 246 AM PDT Sun May 26 2024 .SYNOPSIS... High pressure to the south will bring some warming through Monday followed by minor daily variations through next weekend. The marine layer will become shallower with night and morning coastal low clouds only extending into western portions of the valleys by Monday night. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Low clouds have filled in west of the mountains and have pushed into some of the passes this morning. Breezy conditions continue through the passes where gusts are anywhere from 30 to 50 mph. Winds will slowly weaken through the morning. Marine layer clouds should clear from the valleys by the early afternoon, but will likely stick to the coastal areas through much of the day. Elsewhere skies will remain clear. Today highs will be around 5 to 10 degrees higher than Saturday for inland areas, with the most notable change in the mountains and deserts. Not much change at the coast as the marine layer moderates temps. More warming is expected for Memorial Day as an upper level high over Mexico slowly expands westward and amplifies into the Southern Rockies - a bit further east than previously forecast. This will also cause the marine layer to become more shallow, only extending into portions of the valleys Monday morning with better clearing during the day. Through the middle of the week the upper high continues to expand westward while we remain under weak cyclonic flow with an upper low passing by well to the north. Though there are some differences in the speed and amplitude of this low, it remains far enough away that it won`t influence the weather here much. Overall high temperatures will only fluctuate a couple degrees every day and remain within 5 degrees above normal: slightly below normal for the coasts and valleys and slightly above normal in the deserts. A short wave ridge moves across on Saturday for additional minor warming. Otherwise we`ll see May Gray transition to June Gloom this week with a continuation of night and morning low clouds and patchy fog, mainly for the coastal areas and western valleys. && .AVIATION... 260920Z...Coast/Valleys/Coastal Slopes...BKN-OVC with bases 2000- 2500 FT MSL are occurring this morning. Reduced vis where low clouds and terrain intersect. Scatter out 16z-18z Sun across inland areas, with patchy cigs continuing at the coast through Sun afternoon. Low clouds spreading back inland after 00z Mon with bases 1200-2000 FT MSL. Mountains/Deserts...Clear skies through Sun night. W-NW wind gusts 30-40 kts continuing through 14z Sun below the San Gorgonio Pass, leading to MOD up/downdrafts over/east of mtns. W-SW wind gusts up to 25 knots over/east of mtns after 00z Mon. && .MARINE... West to northwest winds around 20 knots will occur in the outer coastal waters (30-60 NM from the coast) each afternoon and evening 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...SS AVIATION/MARINE...EA