High temperatures for today for the deserts, mountains, and far inland valleys will be 15 to 20 degrees above average. For Tuesday through Thursday, stronger onshore flow will spread cooling inland and deepen the marine layer with Thursday high temperatures for the mountains, valleys, and inland Orange County around 5 degrees below average. This will be followed by a warming trend for Friday through next weekend with inland high temperatures for next weekend 5 to 10 degrees above average.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Wednesday), High pressure will continue the warming today with high temperatures for the mountains, deserts, and far inland valleys 15 to 20 degrees above average. High temperatures for today will range from around 70 near the coast to the 90s for the Inland Empire with 105 to 110 for the lower deserts. High pressure aloft will begin to weaken across southern California on Tuesday with low pressure moving inland into California on Wednesday. Cooling will spread inland and the marine layer will deepen.
For Wednesday, high temperatures for the deserts will be around 5 degrees above average with the coast and valleys a few degrees below average. High temperatures on Wednesday will range from the mid to upper 60s near the coast to the mid 70s to lower 80s for the Inland Empire with the lower deserts 95 to 100.
Night and morning coastal low clouds will spread inland into portions of the western valleys early this morning, into portions of the inland valleys for early Tuesday, and across much of the valleys for early Wednesday.
(Thursday through Sunday), High temperatures for Thursday will cool a few more degrees followed by warming for Friday through next weekend. High temperatures around 5 degrees below average on Thursday for the mountains, valleys, and inland Orange County will warm to 5 to 10 degrees above average for inland areas for next weekend. High temperatures for next weekend will range from around 70 near the coast to the 80s for the Inland Empire with the lower deserts in the upper 90s to 103.
110930z, Coast/Valleys, Low clouds based at around 800-1200 feet MSL with tops to 1900 feet will continue to spread into western valleys through 14Z. Inland vis locally reduced 1-5SM. Scatter out 16-18Z. Low clouds with similar bases and vis to move ashore after 03Z and spread into far western valleys by Tuesday morning.
Otherwise, SKC and VFR today and tonight.
No hazardous marine conditions are expected through Friday.
Ca, Heat Advisory from 10 AM this morning to 8 PM PDT this evening for San Bernardino and Riverside County Valleys-The Inland Empire.
Extreme Heat Warning until 8 PM PDT this evening for Coachella Valley-San Diego County Deserts-San Gorgonio Pass near Banning.
PZ, None.
