389 FXUS66 KSGX 110408 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 908 PM PDT Thu Apr 10 2025 .SYNOPSIS... Warm weather will continue over the region through Friday with a subtle cooling trend through the weekend. High pressure aloft will contribute to a shallow marine layer with foggy conditions near the beaches through Friday as well. Low clouds and fog will move further inland by the weekend as a troughing pattern sets up across the region. This will also bring breezy conditions across the mountains and deserts. This pattern will continue into next week with minimal day to day changes in the weather pattern with highs above average inland and near average closer to the coast. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... It was a toasty day for inland locations. Highs in the valleys and High Desert reached the 80s and 90s; upper 90s to 101 degrees in the low deserts; and 70s to near 80 degrees in the mountains. Only one high temperature record was reached, with Palm Springs tying it`s daily high temperature record of 101 degrees. Highs tomorrow are expected to be quite toasty as well. Palm Springs, Campo, Big Bear Lake, and Ramona are forecast to tie or break high temperature records Friday. At 9 PM, areas of fog were lingering along the immediate coast. Fog coverage will become more widespread overnight but will remain within a few miles of the coast. In areas of fog, visibility of 1 mile or less is expected. Patchy fog is expected to linger along some beaches into Friday afternoon. Previous discussion issued at 2 PM April 10, 2025... An area of high pressure centered over Baja California is currently peaking in strength. This will continue the sunny skies and warm temperatures across the region into Friday, along with a shallow marine layer with foggy conditions at the coast. The hottest temperatures of the next seven days will occur for most areas on Friday as well. Confidence is moderate to high in seeing temperatures hit at least 100 degrees across the Anza-Borrego Desert and the Coachella Valley. Like today, highs will again be near 90 degrees from the high desert, Inland Empire and far inland valleys/foothills of SD County. A trough off the coast will move closer to the region by the weekend, bringing temperatures down by 5-10 degrees from where they will be on Friday. The troughing pattern will also bring windier conditions across the mountains and adjacent deserts as NBM and WRF models show chances of seeing wind gusts over 30 MPH. This chance will be lower on Friday near 20-50%, increasing 40-70% by Saturday. West winds will favor the San Gorgonio Pass to see the highest winds. The marine layer will deepen with the passage of this system as well, where low clouds will extend further into the valleys with fog more confined to higher coastal terrain. Models are in fairly good agreement on a series of weak low pressure systems moving through the region next week. This would continue the benign weather pattern with highs slightly above average inland and near average for the coastal areas with night/morning low clouds as well. && .AVIATION... 110300Z...Coast...Patchy areas of low clouds/fog along northern San Diego County this evening will start to expand along the coast and into areas within a few miles late tonight after 06Z. Bases 200-400 ft MSL with vis reductions 0-2 SM where clouds are present. 50% chance for impacts at KSAN by 09Z, with KCRQ and KSNA likely remaining mostly clear again (30% chance for impacts). Fog clearing to the beaches 15-17Z, where they will again linger in areas through the afternoon. Low clouds with slightly higher bases developing and moving inland again after 05Z Sat. Elsewhere...Mostly clear skies tonight and Friday with VFR conditions. && .MARINE... Areas of fog with visibility 1 NM or less are expected again through Friday morning. Otherwise, no hazardous marine conditions are expected through Monday. && .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...CO AVIATION/MARINE...CSP