Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
389 FXUS66 KSGX 291556 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 856 AM PDT Wed May 29 2024 .SYNOPSIS... Generally seasonal weather will prevail into next week. There will be a warming trend through Thursday with inland high temperatures on Thursday around 4 to 8 degrees above average. Not much change for Friday, then a few degrees cooler for the weekend. A gradual warming trend is expected for the early and middle part of next week. There will be gusty west winds for the mountains and deserts for each late afternoon through late evening with the stronger gusts to 25 to 35 mph. The marine layer will generally fluctuate between 2000 and 2500 feet deep with night and morning coastal low clouds spreading into portions of the valleys. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .Morning Update... Low clouds made it into most valleys and coastal areas west of the mountains this morning. GOES imagery shows these marine layer clouds quickly retreating toward the coast this morning. This morning`s sounding shows near a 5-6C inversion vs. yesterday`s sounding with a 7-8C inversion. Seeing this, along with stronger southerly flow of clouds, should lead to better clearing toward the coast later today. This will also yield slightly warmer temperatures near these areas with highs near 65-70 degrees. Slightly less windy today across the mountain passes and deserts with wind gusts 25-40 MPH expected. A little discrepancy in NBM and HREF >30 MPH wind probabilities for this afternoon, but expect winds to be strongest in the San Gorgonio Pass. We will continue to watch the region for next week as a large ridge is expected to build in across the western U.S., which will bring warmer temperatures and a bit less coastal/valley cloud coverage to our region. .Previous Forecast (344 AM Today).... .SHORT TERM (Today through Friday)... Generally seasonal weather will prevail into next week with night and morning coastal low clouds spreading into portions of the valleys, gusty southwest to west winds for the mountains and deserts for each late afternoon through late evening, and temperatures fluctuating around average. The marine layer early this morning is around 2000 to 2500 feet deep with coastal low clouds extending inland into portions of the inland valleys. The warming trend will continue into Thursday with high temperatures today a few degrees warmer than Tuesday for most areas with the greater warming on Thursday, as much as 4 to 8 degrees warmer than today for the mountains. With the warming, Thursday high temperatures for the mountains and deserts will be around 4 to 8 degrees above average with the valleys a few degrees above average and locations near the coast around average. With the warming, high temperatures for the lower deserts will be around 100 to 106 on Thursday with the Inland Empire mostly in the 80s. Not much change in high temperatures is expected for Friday. The marine layer will be a little shallower for tonight into Thursday morning with coastal low clouds not spreading as far into the inland valleys with not much change for Thursday night into Friday morning. && .AVIATION... 291540Z...Coast/Valleys...Low clouds with bases 800-1200 feet MSL with tops to 2000 feet filled the coastal basin this morning but are already beginning to scatter out. Vis 0-5SM in inland valleys. Clouds will clear out over inland areas through 17-18z, with skies clearing closer to the coast 18-20z, but with only brief, partial and intermittent clearing at the coast. Low clouds will march inland again after 01Z, but will have slightly lower bases, around 600-1000 feet MSL and not reach as far inland by 12Z Thursday. Mountains/Deserts...Mostly clear today. Areas of gusty westerly winds 30-40 knots on desert mountain slopes and locally into the deserts after 22Z. && .MARINE... No hazardous marine conditions are expected through Sunday. && .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...APR/17 AVIATION/MARINE...Adams