The marine layer will continue to slowly deepen to around 5000 feet for early Wednesday. There could be some drizzle or light rain from this deep marine layer at times, mainly late at night into the morning into Thursday morning. High temperatures will lower several degrees for Tuesday and Wednesday to as much as 20 to 25 degrees below average for the mountains on Wednesday. Southwest to west winds in the mountains and deserts will strengthen for this afternoon through Wednesday night, with gusts of 40 to 50 mph with isolated gusts to 70 mph through the passes. There will be warming for Friday through next weekend with the marine layer becoming shallower.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Thursday), A closed low pressure system will move across western Oregon today and into California and Nevada for Wednesday and Thursday before beginning to weaken and move east on Friday. High temperatures for today will cool as much as 10 to 15 degrees today for some inland areas and as much as another 5 to 10 degrees on Wednesday for the mountains and deserts. With the cooling, high temperatures for the mountains on Wednesday will be as much as 20 to 25 degrees below average. High temperatures on Wednesday will be mostly in the 60s for the coast and valleys and in the upper 70s to mid 80s for the lower deserts with the mountains mostly in the 40s and 50s and the high desert in the 60s.
Satellite imagery shows coastal low clouds extending well inland across San Diego County onto the coastal slopes of the mountains and spreading northward across the Inland Empire and Orange County with low clouds spreading through the Cajon Pass. The marine layer will continue to slowly deepen to around 5000 feet for early Wednesday. There could be some drizzle or light rain from this deep marine layer at times, mainly late at night into the morning into Thursday morning.
Onshore flow will be stronger for today and Wednesday with southwest to west winds for the mountains and deserts gusting to 40 to 50 mph at times with gusts to 70 mph in the northern Coachella Calley below the San Gorgonio Pass for this afternoon through Wednesday night.
(Friday through Monday), The warming trend will continue through the weekend into early next week. High temperatures of 5 to 10 degrees below average for inland areas on Friday will warm to 5 to 10 degrees above average for Monday of next week. High temperatures on Friday will range from the mid to upper 60s near the coast to the 70s for the Inland Empire with the lower deserts around 90. For Monday of next week, high temperatures will range from the lower 70s near the coast to the mid 80s to mid 90s for the Inland Empire with 102 to 106 for the lower deserts. Night and morning coastal low clouds will spread into portions of the inland valleys for early Friday and early Saturday, then only into the western valleys for early Sunday and early Monday.
261200z, Coast/Valleys/Foothills, Low clouds with bases 2500- 3000ft MSL have filled in across the coastal basin this morning through to the coastal mountain foothills. Patchy -DZ will be possible around 13-18z as the marine layer deepens. Highest chances will be in areas near the coast. Cloud bases will likely lift slightly after 17-19Z to 3000-3500ft MSL and scatter out for the inland valleys. Orange County and portions of coastal San Diego County may see intermittent scattering in the afternoon, but should remain more BKN than SCT. Marine layer clouds quickly refill the coastal basin between 00-06z Wednesday, with bases settling back down to 2500-3000ft MSL. Higher Mountains/Deserts, Mostly clear skies and VFR conditions expected through the TAF period. West to southwest winds will pick up after 18-19z. Widespread gusts 30-40 kts with isolated gusts to 60 kts through the passes. Winds taper off some between 06-12z Wednesday, but remain fairly elevated through the overnight hours.
Winds and seas increase Tuesday afternoon and into early Wednesday, generating hazardous conditions for small craft in the outer waters, especially near San Clemente Island. For more details, see the Small Craft Advisory product. Winds and seas decrease Wednesday night, with no hazardous marine conditions are expected thereafter through Saturday.
Ca, Wind Advisory from 3 PM this afternoon to 5 AM PDT Thursday for Riverside County Mountains-San Diego County Deserts-San Diego County Mountains-San Gorgonio Pass near Banning.
Wind Advisory from 3 PM this afternoon to midnight PDT tonight for Apple and Lucerne Valleys.
PZ, Small Craft Advisory from 1 PM this afternoon to 1 PM PDT Wednesday for Waters from San Mateo Point to the Mexican Border Extending 10 to 60 nm out including San Clemente Island.
