, Issued at 1110 PM PST Wed Dec 10 2025 (Tonight through Friday)
Different day, same weather. Tule fog continues to fill the Central Valley with spill over through the Delta and across the Valleys in the East Bay and North Bay. The visibility is already less than a mile at Livermore and Santa Rosa airports with a good chance to worsen through the night. As we've seen over the last several days, the fog and clouds should erode for most in the afternoon, but may linger along the Delta and San Pablo Bay regions. Anywhere in the fog will continue to deal with cold temperatures while those areas in full sunshine will quickly warm well above normal. The 00Z sounding found a surface temperature of 56 degrees while the temperature at 3,000 feet was 70 degrees. This strong inversion continues to make the max temperature forecast challenging with some areas up to 10 degrees cooler than normal and others up to 10 degrees warmer. We continue to rely heavily on the persistence forecast which has been performing better than any model recently.
..issued at 1110 PM PST Wed Dec 10 2025 (Friday night through next Wednesday)
The forecast remains fairly consistent through Friday before the ridge axis finally slides to our East. This won't have a drastic effect immediately, but the temperatures should cool a couple degrees through the weekend. By Sunday or Monday we should start to see some high clouds, indicating that the ridge has flattened and zonal flow has moved in. This new pattern should help scour out the persistent fog. We also expect some light rain early next week, particularly across the North Bay. The most interesting development in the forecast is in the extended long range, where there is a moderate chance for an atmospheric river late next week. It's too early to talk about specific impacts or timing, but the Climate Predication Center has placed the Bay Area in a moderate risk for both heavy precipitation and strong winds from 12/18-12/21. The bullseye looks like far northern California, but that has been trending south over the last few model updates.
(12z TAFS) Issued at 327 AM PST Thu Dec 11 2025
Another rinse and repeat setup today with a short period of clearing tonight for North Bay terminals and return of fog and stratus overnight tonight with IFR/LIFR cigs and vis. Some signs point towards a later return, but confidence in this timing is low.
Vicinity of SFO, Anticipating patchy stratus and fog along the SF Peninsula this morning through sunrise. Low chance of actually impacting the terminal. If any impacts do arise, they'll likely be IFR cigs invof the terminal for a short period just after sunrise. Otherwise VFR.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, High confidence in VFR through the TAF period. Light drainage offshore winds overnight with light onshore flow during the afternoons.
(today through Tuesday) Issued at 327 AM PST Thu Dec 11 2025
High pressure off the coast will maintain northerly fresh breezes across the outer coastal waters with light to gentle breezes near shore. Light offshore winds will continue from the Delta to the San Francisco Bay and through the Golden Gate. A new, long period northwesterly swell will last into this weekend.
Issued at 1110 PM PST Wed Dec 10 2025
Long period NW swell is causing hazardous beach conditions through Friday. This energy brings strong rip currents, an increased risk for sneaker waves, and large breaking waves. This coincides with nice warm weather, which will likely lure more people to the beach under a false sense of security. A Beach Hazard Statement is in effect through Friday evening. Respect the power of the ocean and never turn your back on it.
Ca, Beach Hazards Statement through Friday evening for CAZ006-505- 509-529-530.
PZ, Small Craft Advisory until 3 PM PST this afternoon for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 10-60 NM.
