High temperatures for the mountains and deserts will warm through Thursday. High temperatures for the coast and valleys will warm several more degrees today, then slowly cool into next weekend. Night and morning coastal low clouds will return and increase in coverage during the middle of the week, then spread farther into the inland valleys by next weekend.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Thursday), Weak offshore flow will continue for inland areas today with high temperatures for inland areas warming 5 to 10 degrees. High temperatures for the coast and valleys will be around 5 degrees above average for today with the mountains and deserts a few degrees below average. High temperatures for today will range from around 70 near the coast to the 80s for the Inland Empire with the lower deserts in the lower to mid 90s.
High temperatures for the mountains and deserts will warm another 5 degrees on Wednesday and another few degrees on Thursday. High temperatures for coastal areas will cool a few degrees on Wednesday with cooling of a few degrees spreading into the valleys on Thursday. High temperatures on Thursday will be a few to around 5 degrees above average with high temperatures ranging from around 70 near the coast to the 80s for the Inland Empire with the mid to upper 90s for the lower deserts.
While the NKX sounding for late Monday afternoon showed the marine layer was still around 3500 feet deep, higher-resolution model guidance shows little or no return of coastal low clouds this morning except possibly some patchy low clouds near the southern San Diego County coast before sunrise. For tonight into Wednesday morning, those models develop a weak coastal eddy with low clouds spreading northward and locally inland along the San Diego County coast, possibly into portions of Orange County. For Wednesday night into Thursday, greater inland spread of the coastal low clouds is expected with low clouds spreading into portions of the San Diego County valleys and portions of the Inland Empire.
(Friday through Monday), Not much change in high temperatures is expected for the mountains and deserts with slight additional cooling for the coast and valleys. For next Monday, high temperatures will range from around average near the coast to around 5 degrees above average for the mountains and deserts. High temperatures for next Monday will range from around 70 near the coast to the upper 70s to upper 80s for the Inland Empire with the lower deserts in the upper 90s to 102. Night and morning coastal low clouds will spread into portions of the inland valleys late each night.
191700z, Mostly clear skies expected through early Wednesday morning. Offshore breezes with strongest gusts 20-25 kts through mountain passes and foothills will diminish within the next few hours. 30-70% chance for low clouds based 1000-2000 ft MSL over coastal San Diego County after 11z (highest chances near KSAN). Low clouds will scatter to the coast by 16-17z Wed.
West-northwest winds will gust to near 20 kts over outer coastal waters this afternoon and evening. Otherwise, no hazardous marine conditions are expected through Sunday morning.
Ca, None. PZ, None.
