Above average high temperatures will cool to below average for Thursday through the weekend, then warm to above average by the middle of next week. Night and morning coastal low clouds will spread farther into the valleys by the weekend. There is a slight chance of showers and thunderstorms for this afternoon along the desert slopes of the mountains.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, Corrected aviation discussion,
(today through Thursday), The late Monday afternoon sounding at NKX showed mid level moisture centered around 600 mb with an isolated thunderstorm over the desert slopes of the San Diego County mountains during the late afternoon on Monday. Higher-resolution models show convective development on the desert slopes of the mountains once again for this afternoon along with a slight chance of showers and thunderstorms. This will be followed by drying for Wednesday and Thursday.
High temperatures for today will be a few degrees warmer than Monday with high temperatures for today ranging from a few degrees above average near the coast to 5 to 10 degrees above average for the deserts. High temperatures for today will range from the lower to mid 70s near the coast to the mid 80s to mid 90s for the Inland Empire with 108 to 112 for the lower deserts.
There will be inland cooling on Wednesday with the greatest cooling of high temperatures, of around 5 degrees, for the mountains. There will be additional cooling on Thursday with high temperatures a few degrees cooler near the coast and around 5 degrees cooler for inland areas. High temperatures on Thursday will be as much as 5 degrees below average for the inland valleys onto the coastal slopes of the mountains. High temperatures on Thursday will range from the lower 70s near the coast to the 80s for the Inland Empire with 104 to 108 for the lower deserts.
A marine layer around 1500 to 2000 feet deep will deepen to around 2000 to 2500 feet on Thursday with night and morning coastal low clouds spreading farther into the western valleys for early Thursday.
(Friday through Monday), There will be additional slight cooling on Friday and Saturday, followed by slight warming on Sunday and greater warmer for Monday and Tuesday of next week. High temperatures on Saturday will be around average at sea level to 4 to 8 degrees below average for the mountains and inland valleys. High temperatures on Saturday will range from around 70 near the coast to the upper 70s to mid 80s for the Inland Empire with 100 to 104 for the lower deserts. Night and morning coastal low clouds will spread farther into the valleys into the weekend, then spread inland only into the western valleys for early next week.
160930z, Coast/Western Valleys, Somewhat patchy low clouds based 1100-1500 ft MSL will persist along the coast and up to 10-15 miles inland until mid-morning, with local areas of vis 3-6 SM for higher terrain in coastal/western valley areas. Low clouds will begin their retreat west after 15Z, clearing offshore 17-18Z. Similarly based low clouds move back ashore in San Diego Co after 03Z Wed and Orange Co after 09Z Wed, with similar inland extent.
Mountains/Deserts, Mostly VFR conditions are expected through the TAF period, with the occasional SCT-BKN clouds 12-15k feet MSL. Breezy westerly winds gusting 25-30 kts through mountain passes and into deserts again Tuesday after 19Z through about 06Z Wed. Cumulus based around 10k ft MSL will develop over mountains and parts of deserts, with a 10-15% chance for an isolated SHRA/TSRA over the mountains and desert slopes this afternoon.
No hazardous marine conditions are expected through Saturday.
Elevated surf and strong rip currents continue through Friday. Surf of 3-6 feet with sets to 7 feet are expected at south-facing beaches. Surf for southern San Diego County will be slightly lower, but hazardous swimming conditions with high rip current and longshore current risk will still exist. See the Beach Hazards Statement for more details.
Ca, Beach Hazards Statement through Friday evening for Orange County Coastal Areas-San Diego County Coastal Areas.
PZ, None.
