Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
821 FXUS66 KSGX 300349 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 849 PM PDT Tue Jul 29 2025 ...TSUNAMI ADVISORY IS IN EFFECT FOR THE COASTAL AREAS OF ORANGE AND SAN DIEGO COUNTIES... .SYNOPSIS... Minor day to day changes are expected through the week as weak troughing persists. This will bring near average temperatures with marine layer clouds each night and morning near the coast and adjacent valleys. High pressure to the south may bring slightly warmer weather by the weekend to inland areas, but near to below average temperatures may return by next week. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .UPDATE... A Tsunami Advisory has been issued for coastal San Diego and Orange counties. Current forecast estimates less than 1 ft at La Jolla and less than 1 ft at Oceanside. If you are in the advisory area, remain out of the water and avoid the beaches. A tsunami is capable of producing strong currents that may be hazardous to swimmers, boats, and coastal structures. Otherwise, no significant changes to the forecast package. .PREVIOUS FORECAST FROM 136 PM... Beautiful clear skies are seen over SoCal this afternoon out our window and on GOES imagery. Low clouds will return this evening across the coast and western valleys with slightly less inland extent than this morning. The weather pattern remains stagnant with high pressure over Northern Mexico and a trough draped across Northern California. This pattern will remain relatively unchanged through Friday, bringing temperatures near normal and elevated diurnal winds across the mountain desert slopes into the deserts. Highs will be in the 90s for the Inland Empire and High Desert, closer to 110 across the lower deserts; other areas will be in the 70s and 80s. Models depict high pressure across Mexico expanding over Southern California by the weekend. This may help temperatures rise a few degrees, especially in the lower deserts, where highs may rise near 5 degrees above normal in the Coachella Valley. Ensemble models show the potential for yet another trough to form over the West Coast, which would bring near normal to slightly below normal temperatures with continued dry weather. && .AVIATION... 300330Z....Coasts/Western Valleys...Low clouds are beginning to develop and move inland along the San Diego County coast, with bases 700-1400ft MSL. Bases are expected to fall closer to 600-1000ft MSL after 07z. Clouds will be patchy, with intermittent CIGs for coastal sites until 11z before more persistent high-end IFR CIGs prevail through 15z. Low clouds are only expected to make it up to 5-8 miles inland overnight. Clouds clear to the beaches by 17z with nearly complete clearing by 20z. Patchy low clouds develop again Wednesday night, but may not push inland until after 10z Thursday. .Inland Valleys/Mountains/Deserts...Mostly clear with VFR conditions through Wednesday. && .MARINE... A Tsunami Advisory is in effect for coastal Orange and San Diego Counties. A tsunami is capable of producing strong currents that may be hazardous to boats, and surging water in and out of harbors can cause boats and docks to detach from structures. A Marine Weather Statement is in effect and contains more information for the marine waters. && .BEACHES... A Tsunami Advisory is in effect for coastal Orange and San Diego counties. If you are located in this coastal area, move off the beach and out of harbors and marinas. Do not go to the coast to watch the tsunami. Be alert to instructions from your local emergency officials. A Marine Weather Statement is in effect and contains more information. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ PUBLIC...Zuber AVIATION/MARINE/BEACHES...Zuber