The upper low that brought rain to the Central Coast on Thursday is nearly stationary to our south between Monterey and Los Angeles. The marine layer - after being disrupted by the late week storm system - reestablished itself late yesterday and deepened to near 2000 feet. Clouds this morning were far more widespread and clung to the immediate coast all day. Weak flow and sufficient moisture aloft combined with weak onshore surface flow have kept the clouds around. Overnight lows last night also stayed mild with water temperatures remaining in the middle 60s and increased moisture levels left over from the late week weather system. Highs today were on the cooler side with the enhanced cloud cover and continued cooler air aloft.
TONIGHT: Low clouds are already positioned along the coast and starting to spread inland late this afternoon. Expect that trend to continue and extensive cloud cover for all coastal areas and inland valleys overnight. Patchy ground fog will also be scattered in places. Temperatures stay mild once again tonight with coastal lows near 60 and inland lows mainly in upper 50s to near 60.
TOMORROW: Low clouds will linger for the first half of the day with inland locations clearing mid to late morning. The coast should see more sun tomorrow than today, but some areas, particularly along the Peninsula and Big Sur Coast will stick with patchy low cloud cover. Temperatures will be similar. Inland highs will stay below average topping into the 70s and 80s. The hottest locations in southern Monterey and San Benito Co will get close to 90. Coastal highs will reach into the upper 60s to low 70s. I think we will see a little more sunshine along the coast tomorrow. In that case, coastal highs will warm a few degrees over today.
EXTENDED: The upper low off the coast will start to move northeast on Sunday as an unusual deep upper low develops in the Gulf of Alaska. With not much push for cooler drier air, temperatures will remain about the same with muggy conditions through the weekend. Subtle ridging builds on Monday and Tuesday, which will allow for a brief warm up. The upper trough in the Gulf of Alaska will begin to move east on Tuesday and Wednesday sending a couple storm systems into the Pacific Northwest. This will result in deepening the Marine Layer with a little cooler temperatures. A stronger storm system moves into Washington and Oregon on Wednesday the Thursday with a cold front extending southward along the Central Coast. There is a possibility that we could see a few showers on Thursday much like last week’s event. Then high pressure builds in on Friday with breezy conditions as a deep low develops over Nevada.
The Outlook for the Central Coast for September 25th through October 3rd calls for Near to Above Normal Temperatures and Near Normal Precipitation...which is very little this time of year.
Updated by Meteorologist Ryan Smithies on Saturday at 4:45 p.m.