Aviation and Marine Discussions,
.SHORT TERM (Today through Wednesday), The marine layer will gradually deepen to around 5000 feet by early Wednesday as a closed low pressure system moves into the Pacific Northwest tonight and into central California on Wednesday. This will strengthen the onshore across southern California with southwest to west winds for the mountains and deserts gusting to 35 to 45 mph at times for Tuesday afternoon through Wednesday night with isolated gusts to 65 mph through the northern Coachella Valley below the San Gorgonio Pass.
The greatest cooling of high temperatures is expected on Tuesday and Wednesday with Wednesday high temperatures as much as 15 to 20 degrees below average for the mountains. High temperatures on Wednesday will be mostly in the 60s and lower 70s for the coast and valleys with the lower deserts in the 80s.
There could also be some drizzle or light rain from the coast to the mountains, mainly late at night into the morning from late tonight into Thursday morning.
The marine layer will gradually deepen to around 5000 feet by early Wednesday with night and morning coastal low clouds extending well inland and onto the coastal slopes of the mountains. High temperatures will cool several degrees for Tuesday and Wednesday to as much as 15 to 20 degrees below average for the mountains on Wednesday. Southwest to west winds for the mountains and deserts will strengthen for Tuesday afternoon through Wednesday night with gusts to 35 to 45 mph with isolated gusts to 60 mph through the passes. There could be patchy drizzle or light rain from the coast to the mountains during the nights and mornings from late tonight into Thursday morning. There will be warming for Friday through next weekend high temperatures for next Sunday a few to around 5 degrees above average.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, Updated for Aviation and Marine Discussions,
(today through Wednesday), The marine layer will gradually deepen to around 5000 feet by early Wednesday as a closed low pressure system moves into the Pacific Northwest tonight and into central California on Wednesday. This will strengthen the onshore across southern California with southwest to west winds for the mountains and deserts gusting to 35 to 45 mph at times for Tuesday afternoon through Wednesday night with isolated gusts to 65 mph through the northern Coachella Valley below the San Gorgonio Pass.
The greatest cooling of high temperatures is expected on Tuesday and Wednesday with Wednesday high temperatures as much as 15 to 20 degrees below average for the mountains. High temperatures on Wednesday will be mostly in the 60s and lower 70s for the coast and valleys with the lower deserts in the 80s.
There could also be some drizzle or light rain from the coast to the mountains, mainly late at night into the morning from late tonight into Thursday morning.
(Thursday through Sunday), There will be slight warming of high temperatures on Thursday with greater warming for Friday through next weekend with high temperatures for next Sunday generally a few to around 5 degrees above average. High temperatures for next Sunday will range from around 70 near the coast to the 80s for the Inland Empire with the lower deserts around 100.
251730z, Coast/Valleys/Foothills, Cigs will continue for most areas today, but with random and intermittent scatter out, most likely vcnty KSNA and KONT between 20-03Z. Bases will continue around 2500 feet MSL with tops to 4200 feet. Low clouds, around 2500- 3000 feet with tops rising to 5000 feet, will fill the coastal basin overnight, starting around KSAN and moving north/northeast higher into foothills. Only isolated scatter out expected Tuesday, although bases will likely rise above 3000 feet after 16Z.
Higher Mountains/Deserts, Mostly clear and VFR conditions will continue through Tuesday morning. W-SW winds 25-35 kts develop after 23Z, strongest through mountain passes and on desert slopes.
Winds and seas will increase for Tuesday afternoon through evening, approaching hazardous conditions for small craft in the outer waters. Otherwise, no hazardous marine conditions are expected through Saturday.
Ca, Wind Advisory from 3 PM Tuesday 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 Tuesday to midnight PDT Tuesday night for Apple and Lucerne Valleys.
PZ, None.
