Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
728 FXUS66 KSGX 072025 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 125 PM PDT Sat Jun 7 2025 .SYNOPSIS... Temperatures warm through the weekend, peaking Monday and Tuesday, before a slow cooldown into the end of the week. The marine layer becomes more shallow through mid week, but may persist for some coastal areas. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Another cloudy June day for Southern California with fog and drizzle observed across many spots this morning as a upper level low spins off the central coast. Orange County has been slower to clear today compared to Friday, but will start to see some improvements while San Diego County is likely to remain socked in, especially for those within 15 miles from the coastline. This looks to be the last morning of widespread drizzle with increasing heights tonight and tomorrow leading to slightly shallower marine layer Sunday morning. The height increase will be minimal, however, so it remains possible that a few spots see drizzle before 10am Sunday. Regardless, another cloudy morning is expected for nearly all areas west of the mountains with slow clearing through the early afternoon. A warming and drying trend sets in through mid week as upper level ridging builds in over California. The thermal ridge axis will extend from the Desert Southwest up into the Columbia Basin on Tuesday, pivoting to southeastern California through Utah on Wednesday. Subsidence squishes the marine layer and allow temperatures to quickly warm across the deserts and Coachella Valley both Tuesday and Wednesday, with a 85% chance of >105F in the low deserts and Coachella Valley and a 40% chance of >110F, highs around 5-10 degrees above normal for mid June. Even areas further west will see a significant warm up, with 90s in the Inland Empire and upper 80s to low 90s in the San Diego valleys by Tuesday. For coastal areas, moderate onshore flow along with the shallow but persistent marine layer should limit significant warming with temperatures near or just slightly above normal Tuesday and Wednesday. Flow aloft turns more zonal as an approaching trough from the coast of OR moves inland Thursday. This will mark the transition back to average temperatures/cooler weather for SoCal and a deeper marine layer as numerous shortwaves move across NorCal through Saturday. While models differ slightly with the position of a somewhat stationary upper level low off the coast of Canada this weekend, troughing looks to persist over California through at least the weekend and potentially into early next week. && .AVIATION... 072000Z....Coast/Valleys...BKN-OVC low clouds with bases mostly 1200- 2200 ft MSL this afternoon. Partial and intermittent clearing is expected along the immediate coast in Orange County, with cigs likely remaining within 15 miles of the San Diego County coast through the afternoon. Low clouds begin to push inland again after 00z Sun and should fill in the coastal basin around 10Z Sun. Bases will be mostly 600-1200 ft MSL with vis reductions 3-5 SM in the valleys and near higher coastal terrain. Low clouds should clear inland areas through 18Z Sun, with partial and intermittent clearing along the coast Sun afternoon. Mountains/Deserts...Mostly clear skies and unrestricted vis into Sun. && .MARINE... No hazardous marine conditions are expected through Thursday. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ PUBLIC...Zuber AVIATION/MARINE...CO