Expect cool, frosty, and locally foggy mornings through today. Dry and mainly sunny skies continue through next week with a gradual warming trend.
Discussion
Dense fog has picked back up again, with many sites in the southern Sacramento and northern San Joaquin Valley and the Delta currently observing visibilities down to 1/4 mile. This fog is expected to persist to at least 11am, though as with yesterday, areas of fog could continue into the afternoon.
As such, we have a Dense Fog Advisory out through 11am today. There is potential for overnight/morning fog several other days this week as well, with the NBM showing a 10 to 30% probability of visibilities less than 1 mile tonight and into Monday morning in particular.
A weak short wave trough moves through the area today, though it has little to no precipitable water associated with it so conditions are expected to remain dry but with high clouds. Otherwise, expect dry and mostly clear conditions through much of next week. Temperatures will be gradually warming as ridging continues over us, with Valley highs in the 60s, and upper 40s to mid 50s at higher elevations.
Extended Discussion (Thursday through Sunday)
Upper ridging remains dominant synoptic feature over interior NorCal through next week with near to slightly above normal high temperatures. Ridge axis progresses through the CWA early Saturday as upstream short wave troughing progresses. Models differ with strength of this wave leading to some forecast uncertainty late in the extended period. For now dry forecast continues through Sunday with some local night/morning fog possible in the Central Valley.