928 FXUS66 KSGX 050432 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 930 PM PDT Fri Apr 4 2025 .SYNOPSIS... Mostly clear skies and warmer weather will prevail in all areas through Sunday. The warming trend will continue over inland areas much of next week with temperatures 10 to locally 20 degrees above normal. More moderate temperatures will occur near the coast, though still a few degrees degrees above normal. Low clouds will redevelop again sometime next week but maybe be restricted to coastal areas. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Update: Skies have cleared out after scattered light showers and even an isolated thunderstorm over the San Diego County mountains. All recorded rainfall was less than 0.10". Little or no marine layer will exist this weekend as high pressure aloft builds, and we get substantial warming in all areas. High pressure will dominate for the next week, but starting next weekend, model ensembles vary greatly with their solutions as a trough of low pressure will move through at least parts of the West Coast with the southerly extent in question. Previous Discussion: A 554 mb low over Arizona is continuing to push off to the east this afternoon. Behind it, leftover moisture remains in place as scattered clouds move into parts of the mountains and deserts this afternoon. Hi-res models have removed any mentionable precip, but a slight chance remains for a light shower or two across the San Diego County mountains through the afternoon hours. The low will continue to push into New Mexico and parts of west Texas by the weekend, leading to high pressure taking prominence over our region. This will lead to warmer temperatures and sunnier skies over SoCal. Offshore flow has also developed behind this system today with gusts across the mountains near 20-30 MPH. These will become more widespread by Saturday morning, where mountains north of SD County into the Inland Empire will see wind gusts near 25-35 MPH at times. Hi-res guidance shows a low to moderate chance of seeing winds over 40 mph for areas in and just below the Cajon Pass. Winds will become lighter by Saturday evening. A weak trough to the north and a ridge to the south will help to keep us away from much change in terms of temperatures by early next week with highs around 5 to locally 10 degrees above normal. Cluster ensemble guidance remains in fair agreement on the ridge to the south amplifying by the middle of next week. This will help generate another increase in temperatures where some areas will see highs near 20 degrees above normal. NBM probabilities for triple digit heat in the lower deserts are around 20% on Wednesday and 50% by Thursday. 90 degree probabilities are moderate to high across the Inland Empire with lower chances for the SD Co inland valleys and high desert during this time period as well. A trough to the north may push ashore along the West Coast by later next week, which would help to cool our region, but model timing and strength of this feature is uncertain. && .AVIATION... 050315Z...Today`s cumulus field has fizzled out this evening with mostly clear skies expected to persist into Saturday. <10% chance of CIGs due to low marine clouds overnight. North to northeast winds strengthen Saturday morning starting 15Z, with areas of wind gusts 20-35 kts for mountains, deserts and parts of the Inland Empire through early Sat evening. Mod up/downdrafts near the mountains and areas of LLWS possible in valleys, especially Saturday morning. Winds weaken 00-03z Sunday. && .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...Maxwell (Update)/APR (Previous Discussion) AVIATION/MARINE...Munyan