Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
780 FXUS66 KSGX 101605 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 905 AM PDT Mon Jun 10 2024 .SYNOPSIS... Night and morning low clouds will continue west of the mountains this week. High pressure aloft will bring warmer days to the valleys, mountains and deserts through Wednesday. Thursday and Friday will be slightly cooler, then warmer again next weekend. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Update... The 12z Miramar sounding showed a 10.5C degree inversion based near 2100 feet, and a nearly saturated layer as low as 1200 feet. Low clouds cover the coastal basin as of 9 AM, but clouds are starting to erode across the eastern valleys. Most inland areas should clear by late morning or early afternoon, though passing clouds will likely be seen through much of the day at the coast. Highs will warm region-wide today, with highs 6-10 degrees warmer than Sunday across the eastern valleys, the mountains and portions of the deserts. Temperatures will reach the upper-60s at the coast, the 70s to 80s across the inland valleys as well as the mountains, the mid to upper-80s in the Inland Empire, the mid-90s in the High Desert and the mid-100s in the lower deserts. Previous Discussion (Issued 240 AM PDT Mon Jun 10 2024)... A quasi- stationary upper low will spin off the Southern California coast through Wednesday. This trough combined with an intermittent coastal eddy will keep the marine layer depth between 2000-2500 ft deep this week, with low clouds spreading into the valleys each night retreating back to the coast each afternoon. The upper trough will also bring scattered mid and highs clouds. An upper ridge centered over Arizona today through Wednesday will bring warmer days to the deserts, mountains and some of the inland valleys. Tuesday will be the hottest day with high desert highs near 100, lower desert highs from 105-110, and mountain highs in the 80s. On Thursday and Friday upper low off the coast trundles eastward across SoCal for a few degrees of cooling. Then warmer again next weekend behind the departing trough. && .AVIATION... 101530Z...Coast/Valleys...Low clouds with bases 1000-1500 ft MSL, locally down to 700 ft MSL in valley locations, have filled in the coastal basin this morning. Areas of higher terrain will be obscured through 17Z. VIS restrictions of 2-4 SM BR/HZ in valley locations through 17Z.Clearing will occur through 17Z in the valleys and 17Z- 20Z near the coast with local BKN conditions this afternoon near the coast. Low clouds will spread inland after 00Z Tue and only reach the far west and south parts of the Inland Empire by 12Z Tue. Bases will be slightly lower tonight, around 700-1200 ft MSL. There is a 40% chance of cigs with bases below 1000 ft at KONT Tue morning. otherwise, clearing times will be similar Tue morning. Mountains/Deserts...Occasional SCT clouds AOA 25000 ft and unrestricted VIS into Tue morning. && .MARINE... No hazardous marine conditions are expected through Friday. && .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...EA AVIATION/MARINE...CO