High temperatures for inland areas will remain around 15 to 20 degrees above average into the weekend with some record daily temperatures for heat continuing to be tied or broken, mainly for the mountains and deserts but occasionally for the inland valleys as well. The marine layer will become shallower for Thursday through Saturday with coastal low clouds only spreading inland into coastal areas for early Friday and Saturday. Mid and high clouds will spread across the area for this weekend into early next week. High temperatures will cool only slightly during the weekend with greater cooling spreading inland early next week as a low pressure system moves toward the California coast.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Friday), The marine layer is around 2000 feet deep with widespread low clouds over the coastal waters expected to continue to spread into portions of the inland valleys through sunrise. For later today into Saturday, the marine layer will gradually decrease in depth with night and morning coastal low clouds spreading inland into the western valleys for early Thursday and mostly into just coastal areas for early Friday and early Saturday.
There will be slight warming of high temperatures for today and again on Thursday with additional warming of a few degrees on Friday. High temperatures for today will range from around 5 degrees above average near the coast to around 20 degrees above average for the mountains and high desert. High temperatures on Friday will range from around 10 degrees above average near the coast to 20 to 25 degrees above average for the San Diego County mountains. Friday high temperatures will range from the 70s near the coast to the upper 80s to mid 90s for the Inland Empire with the upper 90s to 103 for the lower deserts.
There will be stronger and gusty southwest winds for the deserts onto the desert slopes of the mountains for this afternoon and evening with gusts to 30 to 40 mph.
(Saturday through Tuesday), There will be only slight cooling during the weekend with Sunday high temperatures still around 10 degrees above average near the coast and 15 to 20 degrees above average for inland areas. High temperatures for the weekend will range from the 70s near the coast to the lower to mid 90s for the Inland Empire with the lower deserts in the upper 90s to 103.
For early next week, high pressure aloft will weaken and onshore flow will strengthen as a low pressure system over the eastern Pacific moves toward the Californa coast. High temperatures on Monday will cool around 4 to 8 degrees. The cooling will continue on Tuesday with high temperatures as much as another 8 to 12 degrees cooler for the mountains, high desert, and inland valleys. High temperatures for next Tuesday for the coast and valleys will be mostly in the upper 60s to mid 70s with the lower deserts in the 80s. High temperatures for coastal areas next Tuesday will be around 5 degrees above average with the mountains a few degrees below average.
250930z, Low clouds based 800-1200 feet MSL and tops to 1500 feet will continue to fill coastal areas and western valleys this morning. Vis reduced 3-5SM mainly over higher coastal terrain and valleys. Scatter out to occur 16-18Z. Patchy and intermittent low clouds could linger along immediate coast thereafter. Low clouds with slightly lower bases will increase and spread inland after 02Z. Coverage a little less extensive. Cloud bases and vis should be a little lower tonight into Thursday morning.
Otherwise, mostly clear and VFR conditions will prevail today and tonight.
No hazardous marine conditions expected through Sunday.
Ca, None. PZ, None.
