Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
782 FXUS66 KSGX 261547 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 847 AM PDT Sat Jul 26 2025 .SYNOPSIS... A trough of low pressure will continue cooler than normal weather through the weekend. High pressure will have greater influence on the area from the east, leading to near average temperatures by next week. Breezy west winds will continue this weekend across mountains and deserts, while the marine layer covers areas west of the mountains with low clouds each evening into the morning hours. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .Morning Update... Low clouds will continue to retreat off the beaches by later this morning and into the early afternoon with the northern parts of the Inland Empire last to clear. Taking a look out our window, we have a nice array of higher level clouds out there from cirrus to altocumulus that will continue moving in from the subtropics from our southwest. Today will feel like the beginning of June instead of late July as highs will be 5 to 15 degrees below normal thanks to the low pressure system over Northern California. Inland areas will warm up a few degrees by Sunday, but overall a wonderful weekend out there with no major forecast updates the rest of the week. Enjoy! .Previous Discussion (250 AM Saturday)... Today through tomorrow... High pressure conditions dominate the region, although there is troughing upstream, which has been influencing SOCAL and providing us with relatively cooler temperatures and below the seasonal average for this time of year. This will allow for highs today to be the coolest for the week. Low clouds will begin to scatter out by later this morning from east to west, and there could be some of these clouds sticking around along portions of the coastal areas and periodically going broken throughout the afternoon. The unseasonably cooler temperatures may also allow for some record lows for today and tonight. Tomorrow will be slightly warmer as the trough begins to fill an become absorbed back into the longwave trough to the north. Monday through Friday... By this period in the forecast, there will be a very slow and gradual amplification and shift in the ridge axis over the desert southwest, which will begin to edge ever so slightly toward the region throughout the week and also allow for temperatures to return to being closer to the seasonal average by the middle of the week. the marine layer will also begin to thin and lower during this time. Conditions will remain dry as the monsoonal moisture plume remains confined far enough east that the mountains and deserts will remain storm- free through then. && .AVIATION... 261450Z....Coasts/Valleys...Low clouds based 2200-2800 ft MSL that filled into the coastal basin this morning are beginning to break up per recent satellite imagery. Clouds clearing from inland areas through about 16Z this morning, with coastal areas scattering out 16- 18Z. Mostly clear skies and VFR conditions prevail through the afternoon until low clouds with similar bases to this morning redevelop this evening after 27/01Z. Clouds will spread into San Diego County when they first develop, but will move northward into Orange County by 09Z then the Inland Empire by 12Z. Clouds clear again 27/16-17Z. Mountains/Deserts...Mostly clear with VFR conditions through early Sunday morning. && .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/Stewey AVIATION/MARINE...CSP