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Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
293 FXUS66 KSGX 130958 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 258 AM PDT Thu Jun 13 2024 .SYNOPSIS... Hot dry days are expected for inland areas with the marine layer and onshore flow keeping coastal areas cooler with night and morning coastal low clouds spreading into portions of the valleys late each night. The valleys will be cooler today, otherwise there will be a warming trend through Saturday with high temperatures for inland areas on Saturday around 8 to 12 degrees above average. There will be cooling for Sunday and Monday with Monday high temperatures around 15 degrees cooler than Saturday for inland areas. This will be followed by a warming trend through the following weekend. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM (Today through Saturday)... The marine layer decreased in depth to around 1500 feet by late Wednesday, but is deepening again with the current depth around 2000 feet. Coastal low clouds have spread inland across much of the San Diego County valleys and are spreading into western and far southern portions of the Inland Empire. Night and morning coastal low clouds will continue to spread into portions of the valleys late each night. High temperatures for the valleys will be cooler today, otherwise there will be a warming trend through Saturday with high temperatures on Saturday around 8 to 12 degrees above average with hottest temperatures in the lower deserts to around 116 and in the Inland Empire to around 101. An Excessive Heat Warning is in effect for the lower deserts for Friday and Saturday with Saturday expected to be the hottest day. A Heat Advisory is also in effect for the more inland portions of the Inland Empire, but only on Saturday. It is unlikely any high temperature records will be tied or broken on Saturday. && .LONG TERM (Sunday through Wednesday)... Sunday and Monday will be cooler as a low pressure system moves inland through the western states with high temperatures on Monday for the mountains, inland valleys, and high desert 5 to 10 degrees below average, in the mid 70s to mid 80s for the Inland Empire and around 100 for the lower deserts. High temperatures on Tuesday may be a few degrees warmer with a warming trend continuing through the following weekend. && .AVIATION... 130900Z...Coast/Valleys...BKN-OVC007-012 with tops to 1800 FT MSL will lower to 005-010 through 15Z with areas VIS 2-4SM in FG/HZ. Clouds/fog may reach as far inland as KONT at 10Z but not likely to reach KSBD. Clouds clearing from the valleys 16-18Z, and from the coastal areas 19-23Z. 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...Heat Advisory from noon to 8 PM PDT Saturday for San Bernardino and Riverside County Valleys-The Inland Empire. Excessive Heat Warning from 10 AM Friday to 8 PM PDT Saturday for Coachella Valley-San Diego County Deserts-San Gorgonio Pass Near Banning. PZ...None. && $$ PUBLIC...17 AVIATION/MARINE...Adams