Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
481 FXUS66 KSGX 271217 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 303 AM PDT Thu Jun 27 2024 .SYNOPSIS... Drier and slightly cooler inland for Friday and Friday night. Warming is expected for Saturday and Sunday with Sunday highs around 5 to 10 degrees above average, to around 115 for the lower deserts and around 100 for the far inland valleys. Night and morning coastal low clouds will continue to extend inland into portions of the valleys late each night. There may be slight cooling into the middle of next week with renewed warming toward the end of next week if strong high pressure aloft develops across California and Nevada. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM (Today through Saturday)... High temperatures for the coast and valleys will warm a few to around 5 degrees today with not much change elsewhere. Little change for Friday, then high temperatures for Saturday will warm a few to around 5 degrees with the greatest warming in the valleys. After setting a record for the highest precipitable water value for June for San Diego of 1.78 inch early Wednesday, developing southwest flow aloft will bring a drying trend into early Saturday with precipitable water values falling to around 0.70 inch. That`s a little below the climatological average for late June. NBM has surface dewpoints at Palm Springs falling from around 60 early this morning to around 36 on noon Saturday. Low clouds along the coast of Baja extend northward along the coast of San Diego and Orange Counties into southern Los Angeles County. The low clouds extend locally inland along the coast and into portions of the western valleys in San Diego. The low clouds are expected to extend a little farther into the valleys for tonight into Friday morning. && .LONG TERM (Sunday through Wednesday)... Warming will continue into Sunday with Sunday high temperatures generally 5 to 10 degrees above average, to around 115 in the lower deserts and around 100 for portions of the inland valleys. NBM has dewpoints for Palm Springs increasing into the 40s on Sunday and into the 50s by Wednesday with overnight low temperatures mostly in the 80s for Palm Springs beginning on Sunday. Toward the end of next week, strong high pressure aloft could be centered somewhere across California and Nevada which could bring some of the hottest weather so far this summer for inland areas by Friday and Saturday of next week. && .AVIATION... 270840Z...Coast/Valleys...Low clouds with bases 1300-1700 ft MSL and tops to 2200 ft MSL will continue to develop and spread 15-20 mi inland through 14Z. Low clouds clearing inland 14-16Z and near the coast 16-19Z. Clouds redeveloping near the coast 28/00-03Z and spreading 15-20 mi inland again tonight into Fri morning with similar bases/tops. Otherwise mostly clear with unrestricted vis through Fri morning. Mountains/Deserts...West winds with sfc gusts 25-35 kt developing across portions of the mountains and deserts around 20Z. Local gusts to 45 kt through the San Gorgonio Pass. Mod up/downdrafts over and east of the mountains. Winds diminishing early Friday morning. Otherwise a few Cu developing over the mountain crests this afternoon, dissipating by sunset, and unrestricted vis. && .MARINE... No hazardous marine conditions are expected through Monday. && .SKYWARN... Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...Excessive Heat Warning until 8 PM PDT this evening for Coachella Valley-San Diego County Deserts-San Gorgonio Pass Near Banning. PZ...None. && $$ PUBLIC...17 AVIATION/MARINE...SS