Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
511 FXUS66 KSGX 092044 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 145 PM PDT Thu May 9 2024 .SYNOPSIS... Night and morning marine layer clouds west of the mountains will clear back to the coast each afternoon through Sunday. High temperatures west of the mountains will be similar each day through Sunday, while the mountains and deserts will see a few degrees of warming this weekend. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Cumulus clouds formed over the San Bernardino and Riverside County mountains this afternoon. They will reform again Friday and Saturday afternoon in the broad cyclonic flow around a closed low over the Great Basin. West of the mountains the skies cleared a little more slowly today in the deeper marine layer. They will reform in the coastal areas this evening and spread inland overnight. Over the weekend the marine layer turns a little shallower and low clouds will not spread as far into the valleys Saturday and Sunday. High temperatures west of the mountains will be fairly consistent through Sunday with coastal highs from 65-75 and valley highs from 75-85. Mountains highs in the 60s today will warm into the 70s by Sunday. High desert highs in the mid 70s today will warm into the mid 80s by Sunday. In the lower deserts, highs near 90 today will heat up to near 100 on Sunday. This temperature regime continues Monday through Wednesday as a weak Pacific trough moves inland across Southern California. && .AVIATION... 092035Z...Coast/Valleys...SKC this afternoon. Low clouds will move ashore after 02Z Friday, spreading inland tonight with bases 1500- 2000 ft MSL and tops to 3500 ft MSL. CIG impacts likely at KSAN, KCRQ and KSNA after 02Z-04Z Fri then at KONT and KSBD after 04Z-06Z Fri. Higher terrain obscured with VIS 1-3SM where clouds and terrain intersect. Expect inland clearing 16Z-18Z then clearing at the coast 18Z-20Z Fri. Mountains/Deserts...FEW clouds with bases around 9000 ft MSL this afternoon then clear skies with unrestricted VIS through Friday. && .MARINE... No hazardous marine conditions are expected through Monday. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ PUBLIC...Moede AVIATION/MARINE...PG