Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
175 FXUS66 KSGX 122032 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 132 PM PDT Wed Jun 12 2024 .SYNOPSIS... Marine layer night and morning low clouds and fog will persist along the coast, into the valleys at times, each day into next week. Tomorrow is expected to be a few degrees cooler than today for most locations. Another bout of warming is expected for Friday and Saturday, most noticeable in the lower deserts. Seasonal to slightly below average temperatures will return Sunday through the middle of next week. Periods of gusty southwest to west winds are expected in the mountains and deserts each afternoon and evening into next week. Gusty westerly winds combined with dry and hot conditions in the deserts and desert mountain slopes will create elevated fire weather conditions through the weekend. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Visible satellite at 1 PM this afternoon showed a few patches of low clouds lingering along portions of the northern San Diego and southern Orange County coast. Low clouds are expected to fill inland overnight again tonight, reaching into portions of the valleys, with periods of patchy drizzle. A similar clearing pattern is expected tomorrow, with low clouds clearing inland but locally lingering at beaches in the afternoon. A weak low pressure system will move inland through southern California late Thursday. As a result, a few degrees of cooling are expected for most areas Thursday. The cooling trend will be brief as a weak high pressure system sets up over southeastern California, southern Nevada, and western Arizona Friday and Saturday. For Friday, highs will be a degree or two warmer for the coast and 2-6 degrees warmer for the valleys, mountains, and deserts. Warming will continue into Saturday, which will be the peak of this brief warming trend. Highs are expected to be 3-7 degrees above average for the coast and western valleys and 6-12 degrees above average for portions of the eastern valleys, mountains, and deserts. Moderate to locally major heat risk is expected in the low deserts, with ares of moderate heat risk in the Inland Empire, mountains, and High Desert. During this time its recommended that folks stay hydrated and limit outdoor physical activities between 10am and 5pm. A low pressure system moves inland through the western states Sunday into the middle of next week, bringing seasonal to slightly below average temperatures to the area. Cooling conditions are expected for most areas Sunday and Monday, with a few degrees of warming expected by Tuesday. The increase in onshore flow with the passing trough will also allow for the marine layer to deepen again with low clouds reaching into the valleys. && .AVIATION... 122020Z...Coast/Valleys...Low clouds based 900-1100 ft MSL with tops to 2000 ft MSL coastal waters and locally onshore. After 13/0300 UTC this afternoon low clouds based 900-1100 ft MSL spreading inland mainly near KCRQ first, reaching KONT around 12Z but unlikely to reach KSBD. Areas of VIS 2-4SM in fog where clouds and terrain intersection. Confidence in BKN conditions returning to KSAN around 12/0500Z this evening is moderate. Mountains/Deserts...SKC with unrestricted VIS. && .MARINE... No hazardous marine conditions are expected through Saturday. && .SKYWARN... Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...Excessive Heat Watch from Friday morning through Saturday evening for Coachella Valley-San Diego County Deserts-San Gorgonio Pass Near Banning. PZ...None. && $$ PUBLIC...CO AVIATION/MARINE...Small