Near to slightly below average temperatures expected through Monday. Gradual warming is forecast through the week, with temperatures reaching above average by Tuesday. Hottest conditions are expected Thursday through Saturday with areas of moderate HeatRisk expected for inland locations. The marine layer will remain deep into Monday morning, reaching into the Inland Empire. With building high pressure aloft, the marine layer will become shallower for the middle to end of the week.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
Weak troughing will linger over the US West Coast into tomorrow, maintaining onshore flow, near to slightly below average temperatures, and elevated winds through passes and locally into the deserts. Peak wind gusts this afternoon will be 35 to 40 mph, locally up to 50 mph through the San Gorgonio pass. Winds will weaken as the trough moves north and east Tuesday, allowing for heights to rise and conditions to begin to warm. Highs on Tuesday are forecast to be a few degrees above average for inland locations and 4 to 8 degrees above average for the coast.
Ridging aloft will take the place of the aforementioned troughing for the middle to end of the week. The main axis of the ridge will remain over the Pacific Ocean but the periphery of it will be over the US West Coast. This will result in a warming trend for the middle to end of the week. Warmest conditions will likely be Thursday through Saturday, with highs 6 to 12 degrees above average. Areas of moderate HeatRisk are expected for the Inland Empire and the deserts.
With the predominately onshore flow, the marine layer will stay on the deeper side into tomorrow morning, which will push low clouds into the valleys. Starting Tuesday, the marine layer is expected to become shallower as heights start to rise. By the end of the week, low clouds and fog are only expected along the coast.
071800z, Coast/Valleys, Satellite shows low clouds have pushed offshore, with VFR and SKC prevailing through the afternoon for most locations. Intermittent low clouds at KSAN through the afternoon, around a 10-20% chance of a CIG at any point between 19z-02z Mon. After 02z, low clouds based 1500-2200ft MSL will move inland again, with similar inland extent as occurred this morning.
Mountains/Deserts, VFR with SKC. Elevated southwest-west winds return this afternoon and evening with gusts 20-35 knots along desert slopes and locally into deserts. Gusts may exceed 40 kts through the Banning Pass. MOD up/downdrafts and pockets of LLWS in lee (north and east) of mountains. Winds should begin to fall off after 06z Mon.
No hazardous marine conditions are expected through Wednesday night.
Elevated surf subsided some this morning, though strong rip currents will continue through Monday along with occasional sets to 6 feet along south-facing beaches. Surf builds again Monday evening as a fresh 3-4 foot swell at 18-19 seconds moves into the region. Surf peaks Tues-Wed with sets to 5-8 feet likely at south-facing beaches, then gradually diminishes late this week.
Ca, None. PZ, None.
