High pressure aloft and weak offshore flow will bring warming of a few degrees today with northeast winds gusting to 40 mph near and below the Cajon Pass through this morning. For coastal areas, night and morning coastal low clouds and locally dense fog will continue through Wednesday. Onshore flow will spread cooling of a few degrees inland on Wednesday followed by warming with weak offshore flow on Thursday. Onshore flow and weakening high pressure aloft will spread cooling inland for Friday through Monday of next week, but with high temperatures remaining as much as 10 to 15 degrees above average for some inland areas for Saturday through Monday.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Thursday), Satellite imagery and surface reports show widespread low clouds and locally dense fog extending inland in San Diego County to the mesas and far western valleys and in Orange County inland past Interstate 5. A Dense Fog Advisory continues for coastal areas until 9 AM this morning. There is also weak offshore flow for inland areas with the stronger gusts near and below the Cajon Pass to 40 mph. High pressure aloft and weak offshore lower-level flow will warm high temperatures today a few degrees from those on Monday.
Weak onshore flow for Wednesday will cool high temperatures a few degrees. Stronger high pressure aloft and weak offshore flow for Thursday will bring warming of high temperatures of around 5 degrees for the coast and valleys with not much change for the mountains and deserts. High temperatures on Thursday be as much as 20 degrees above average for portions of the inland valleys onto the lower coastal slopes of the mountains. High temperatures on Thursday will range from the lower 70s near the coast to the upper 70s to mid 80s for the valleys with the lower to mid 80s for the lower deserts. For the coast and valleys, Thursday is expected to be the warmest day of this week.
Through Friday, there will continue to be chances for both daytime high temperature records to be tied of broken, mainly for the mountains, far inland valleys, and lower deserts with a few record warm overnight low temperatures as well.
(Friday through Monday), Weak onshore flow and weakening high pressure aloft will spread cooling inland for Friday through the weekend. High temperatures on Friday will be as much as 18 to 22 degrees above average for the high desert and lower elevations of the mountains, then cool to 12 to 18 degrees above average for the weekend. High temperatures for the weekend will range from the mid to upper 60s near the coast to the 70s for the valleys with the lower deserts in the upper 70s to mid 80s.
On Monday, high pressure aloft may strengthen slightly across southern California as a low pressure system develops farther off the California coast. For Monday, the warmer solutions for southern California area those with stronger high pressure aloft over the western states with low pressure over the eastern Pacific slower to move toward the coast.
161030z, Coast, Low clouds and dense fog will continue this morning. Cigs will continue around 200-300 feet MSL, tops 800 feet, and vis 0-2SM. Scatter out 15-17Z vcnty KSAN, 17-19Z vcnty KSNA. Only partial or intermittent clearing at immediate coast thereafter. Low clouds and fog to return to coastal airports 01-05Z, with slightly higher cigs/vis and extending a little farther inland overnight into Wednesday.
Otherwise, mostly clear skies with unrestricted vis today and tonight.
Areas of dense fog will continue this morning. A Marine Weather Statement contains the details. Otherwise, no additional hazardous marine conditions are expected through Saturday.
Ca, Dense Fog Advisory until 9 AM PST this morning for Orange County Coastal Areas-Orange County Inland Areas-San Diego County Coastal Areas.
PZ, None.
