Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
101 FXUS66 KSGX 120929 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 229 AM PDT Wed Jun 12 2024 .SYNOPSIS... Generally seasonal weather will continue through next week with hot dry days for inland areas with the marine layer keeping coastal areas cooler. Night and morning coastal low clouds will spread into portions of the valleys, then clear to near the coast each afternoon. A little cooler for Thursday, warmer for Friday and Saturday with Saturday the warmest day, then cooler for Sunday through Tuesday. There will be gusty southwest to west winds for the mountains and deserts each late afternoon through late evening. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM (Today through Friday)... High temperatures today for the coast and valleys will be several degrees warmer than Tuesday as the marine layer becomes shallower. Thursday will be a few degrees cooler for most areas to around 5 degrees cooler for the valleys as a weak low pressure system moves inland through southern California late Thursday. High temperatures near the coast will be slightly warmer on Friday to as much as 4 to 8 degrees warmer for the mountains and for the Apple and Lucerne Valleys. These high temperatures will be around 10 degrees above average for the deserts and around 5 degrees above average for the inland valleys. Night and morning coastal low clouds will spread into portions of the valleys each night, then clear to near the coast each afternoon. && .LONG TERM (Saturday through Tuesday)... The warming will continue into Saturday with Saturday the warmest day for most areas for the next week with warmest high temperatures for the lower deserts of around 114 and in the upper 90s for easternmost portions of the Inland Empire. The heat risk from the current forecast would be sufficient for an Excessive Heat Warning for the lower deserts on Saturday, but not quite sufficient on Friday. A low pressure system moving inland through the western states will strengthen the onshore flow and spread cooling inland for Sunday and Monday with Sunday around 4 to 8 degrees cooler than Saturday and Sunday slightly cooler near the coast to another 5 or so degrees cooler for inland areas. The deserts may continue to cool another degree or two on Tuesday while the coast into the valleys begins to slowly warm. Those high temperatures for Monday and Tuesday are a few degrees below average at lower elevations to around 4 to 8 degrees below average for the inland valleys with warmest high temperatures for the lower deserts of 105 or less and for the Inland Empire in the upper 80s. && .AVIATION... 120855Z...Coast/Valleys...Low clouds extend up to 20 miles inland at this hour. Bases are 900-1100 ft MSL with tops to 2500 ft MSL. CIG impacts currently at coastal TAF sites. CIGs will spread up to 25 miles inland, reaching KONT around 10Z but unlikely to reach KSBD. Areas of VIS 2-4SM in fog where clouds and terrain intersect. Clearing in the valleys 16Z-19Z but CIGs lingering near the coast through the afternoon. Mountains/Deserts...SKC with unrestricted VIS through today. && .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...None. PZ...None. && $$ PUBLIC...17 AVIATION/MARINE...PG