000 FXUS66 KSGX 201037 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 335 AM PDT Sat Apr 20 2024 .SYNOPSIS... Warming this weekend with less night and morning marine layer clouds as a ridge of high pressure moves over the area. A low pressure trough deepening down the coast will come ashore next week, bringing gradual cooling and stronger onshore winds. There is a slight chance of showers in the latter half of the week when the trough progresses inland. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Marine layer clouds that cover the Inland Empire and all of Orange and San Diego Counties this morning will retreat back to the coast through midday, but skies may not fully clear at the beaches. Weak high pressure building over the Southwest this weekend will squash the marine layer a few hundred feet, and the night and morning clouds will not extend as far inland tonight and Sunday night. The ridge will bring warming this weekend, the exception near the coast where highs will be in the 60s both days. A few miles inland from the coast the highs will be in the 60s and low 70s. Farther inland it will be much warmer with highs near 80 in the Inland Empire, the 60s and 70s in the mountains, and the mid to upper 90s in the lower deserts. Sunday will be the warmest day with highs from 85-90 in the Inland Empire and the high deserts, near 100 in the lower deserts, but cooler 60s to mid 70s in the coastal zones. The ridge drifts east Monday and Tuesday and an eastern Pacific trough deepening down the West Coast will bring increasing onshore flow, a deeper marine layer, cooler weather and gusty onshore winds Wednesday and Thursday. This trough will bring a chance for light rain or drizzle west of the mountains in the steadily deepening marine layer ahead of the trough, and a chance for post frontal showers Friday and Saturday as the cold core low tracks across Southern California. Highs both days will be 5-10 degrees below average Friday and Saturday with coastal and valley highs in the 60s, mountain highs in the 40s and 50s, high desert highs in the 60s and low desert highs near 80. && .AVIATION... 201030Z...Coast/Valleys...BKN/OVC low clouds will prevail early this morning in most locations with bases 1700-2500 ft MSL and tops to 2800 ft MSL and local VIS 3-5 miles in the valleys. Areas of higher terrain will be obscured through 16Z. Most areas will clear 15Z-18Z. Stratus will develop again near the coast 01Z-05Z Sun, spreading up to 25 miles inland by 09Z Sun, with somewhat lower bases 1200-1600 ft MSL and areas of VIS 1-5 miles in the valleys. Clearing will be slower Sun morning. Mountains/Deserts...Mostly clear skies with unrestricted VIS will prevail through Sun morning. && .MARINE... No hazardous marine conditions are expected through Wednesday. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ PUBLIC...Moede AVIATION/MARINE...Maxwell
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