Dry weather continues through the forecast period. Patchy late night and morning fog will continue to be possible at times in the Central Valley.
Dry and quiet weather is going to continue into the early part of the week as we remain under a ridge of high pressure. A cut off low currently off the coast of central CA will slowly spin north. This will bring mid to high level clouds at times. This cut off low will get phased into a long wave trough over the central US on Tuesday as a short wave trough pushes into the PacNW. This short wave trough will continue to dig reaching the Great Basin late Tuesday into Wednesday. This will bring northerly flow over NorCal but doesn’t look too strong.
Strong upper level ridging builds back in during the day Wednesday. The biggest impact in the short term will be fog. We are seeing patchy fog from around MYV south into the San Joaquin this morning. It is locally dense around the Sacramento River into the Delta. If the dense fog becomes more widespread will have to issue a Dense Fog Advisory. The fog should lift by the late morning.
Fog is expected once again Monday morning, mid to high level clouds will once again limit widespread dense fog but there will still be local areas of dense fog. Similar conditions are expected Tuesday and Wednesday morning. Highs will remain seasonably mild, several degrees above average with overnight near average.
Extended Discussion (Thursday through Sunday)
EC and ensembles support EPAC upper ridge as main synoptic feature over interior NorCal through the extended forecast period. This will result in dry weather with high temperatures slightly above normal. Some patchy night and morning fog possible in the Southern Sac/Northern San Joaquin Valleys. Locally breezy north to east wind possible Friday into Saturday.