Warming will continue for today with high temperatures 5 to 10 degrees above average. This will be followed by cooling through the weekend with Sunday high temperatures a few to around 5 degrees below average. The marine layer will deepen for the weekend with night and morning coastal low clouds covering much of the valleys. Southwest to west winds during the afternoon and evening on Friday and Saturday for the mountains and deserts will gust to 30 to 40 mph. There will be slow warming for early next week with high temperatures on Wednesday within a few degrees of average. The marine layer will decrease in depth with night and morning coastal low clouds not spreading as far into the valleys.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Saturday), High pressure aloft across southern California will continue the warming trend for today with high temperatures a few degrees warmer than Wednesday. High temperatures for today will be a few degrees above average near the coast to 5 to 10 degrees above average for inland areas. High temperatures for today will range from the lower 70s near the coast to the mid 80s to mid 90s for the Inland Empire with 105 to 110 for the lower deserts. The marine layer is around 2000 feet deep. Coastal low clouds will extend inland into the western valleys in San Diego County and into far western and far southern portions of the Inland Empire into this morning.
On Friday, high pressure aloft will begin to weaken and a low pressure system will move to near the West Coast for the weekend. Onshore flow will strengthen and the marine layer will deepen for the weekend. There will be slight cooling of high temperatures on Friday. There will be greater cooling on Saturday with high temperatures a few degrees cooler to 4 to 8 degrees cooler for the mountains, inland valleys, and high deserts.
High temperatures on Saturday will be a few degrees below average for the coast and valleys and around 5 degrees above average for the deserts. High temperatures on Saturday will range from around 70 near the coast to the 80s for the Inland Empire with 102 to 106 for the lower deserts. The marine layer will deepen for Friday afternoon through the weekend. Coastal low clouds will spread into the western valleys early Friday and across much of the valleys for early Saturday.
During the afternoon and evening on Friday and Saturday, southwest winds for the desert slopes of the San Bernardino County mountains and the high desert will gust to 30 to 40 mph with west winds in the northern Coachella Valley below the San Gorgonio Pass gusting to 35 to 45 mph on Friday afternoon and evening and 45 to 55 mph on Saturday afternoon and evening.
(Sunday through Wednesday), High temperatures will cool another 5 degrees on Sunday for inland areas with high temperatures a few degrees below average to around 5 degrees below average for the mountains and inland valleys. High temperatures on Sunday will range from around 70 near the coast to the upper 70s to mid 80s for the Inland Empire with the lower deserts around 100.
High temperatures will warm very slowly for Monday through Wednesday of next week with high temperatures on Wednesday mostly within a few degrees of average. High temperatures for next Wednesday will range from the lower 70s near the coast to the 80s for the Inland Empire with 100 to 104 for the lower deserts.
Coastal low clouds will spread inland across much for the valleys for early Sunday. For Monday through Wednesday, the marine layer will slowly decrease in depth with night and morning coastal low clouds spreading into the western valleys late each night.
041800z, Coast/Valleys, Low clouds have cleared out this morning for the inland areas, but remain in place within a few miles of the coast at 18z. Periods of scattering is expected for portions of the immediate coast, but clouds will linger along the beaches and coasts through the afternoon hours. Cloud cover redevelops and pushes back ashore after 00z Friday. Bases should be similar to this morning, around 700-1100ft MSL with limited extent into the inland valleys - only about a 30-40% chance for CIGs at KONT between 12-15z Fri. Localized VIS reductions to 4-6 SM for inland valleys and higher coastal terrain, with lower VIS where clouds intersect higher terrain.
Mountains/Deserts, Clear skies and VFR conditions through Friday morning.
No hazardous marine conditions are expected through Monday.
Ca, None. PZ, None.
