Record setting heat will continue for some inland areas into the weekend. Mid and high clouds will spread across the area during the weekend. A low pressure sytem moving inland through California around the middle of next week will spread cooling inland for Monday through Wednesday of next week with inland high temperatures falling to a few to around 5 degrees below average on Wednesday. There is a slight chance of precipitation for Tuesday into Wednesday of next week.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Saturday), The marine layer is slightly shallower than 24 hours ago, around 1500 feet deep, with satellite imagery showing coastal low clouds spreading into the western valleys in San Diego County and spreading northwestward across the coast and coastal plain in Orange County. The coastal low clouds could eventually spread into far southern and western portions of the Inland Empire around sunrise this morning. The marine layer will become gradually shallower into Saturday with coastal low clouds only spreading into the far western valleys for early Friday and mostly not past coastal areas for early Saturday.
There will be slow warming into Saturday with high temperatures for some inland areas as much as 20 to 25 degrees above average on Saturday. High temperatures on Saturday 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. Mid and high clouds from the southwest will spread across the area on Saturday.
(Sunday through Wednesday), Weak onshore flow will return on Sunday and strengthen next week as a low pressure system moves toward the California coast and inland through California around the middle of next week. Cooling will begin to spread inland on Sunday with greater cooling for Monday through Wednesday of next week. High temperatures on Wednesday of next week will be mostly in the mid 60s to lower 70s for the coast and valleys and in the upper 70s to mid 80s for the lower deserts, a few to around 5 degrees below average for some inland areas.
That low pressure system will also bring a chance of showers for Tuesday into Wednesday with any rainfall ranging from less than one- tenth inch near the coast to one-tenth to locally one-quarter inch along the coastal slopes of the mountains. There remains model spread on both the time and potential amounts. Cluster analysis shows the model ensemble solutions with the greater potential to generate at least some light precipitation around Tuesday night and Wednesday of next week are those that are slightly stronger with the low pressure centered along the California coast.
260930z, Low clouds will continue to gradually fill coastal areas and western valleys. Bases range between 800-1200 feet MSL with tops to 1300 feet. Vis reduced 0-5SM in FG on higher coastal terrain and western valleys. Scatter out 15-17Z. Low clouds with bases around 500-900 feet MSL to develop and cover most coastal areas eventually after 04Z tonight into Friday.
Otherwise, mostly clear and VFR conditions will prevail today and tonight.
No hazardous marine conditions expected through Monday.
Ca, None. PZ, None.
