Issued at 912 PM PST Thu Dec 11 2025
Par for the course for this weather pattern, satellite shows fog expanding back into the East Bay and North Bay. Visibility data from Byron and the Concord Airport shows visibilities are lowering to around 2 to 4 SM as of this evening. Given the persistent high pressure and no real change to our atmospheric conditions, fog is likely to be in the same locations tonight as it was last night. While widespread dense fog is not expected, localized dense fog is possible particularly across the North Bay Valleys and along the delta. Make sure to take care while driving tonight and during the morning commute and be prepared to slow down if you encounter any sudden changes in visibility.
, Issued at 209 PM PST Thu Dec 11 2025 (This evening through Friday)
Clearing skies have finally returned to much of the region, aside from the far interior East Bay and bay side areas of Marin County. Thus, as high pressure remains in place over the Bay Area and Central Coast, we are expecting to see temperatures reach into the mid to lower 70s in the higher terrain and interior areas of the Central Coast. Elsewhere, mid 50s to lower 60s can be expected around much of the Bay Area, North Bay and East Bay this afternoon. These areas still remain under the influence cooler conditions observed in the Central Valley as offshore winds persist.
Tonight, expecting another return of tule stratus and/or fog across much the valleys in the North Bay, East Bay, South Bay, and areas around the Bay Area. This is as high pressure remains parked over the region and light to moderate offshore winds.
For Friday, temperatures will largely be above average for this time of year, again expect for those that remain beneath the cloud cover for much of the day. We have warmer temperatures across the board for Friday but have largely used persistence as guidance.
..issued at 209 PM PST Thu Dec 11 2025 (Friday night through next Wednesday)
By Saturday the ridge axis shifts to the east and gives way to more of a zonal flow aloft. However, temperatures will still remain some 5-10 degrees (up to 15 degrees in the higher elevations) above seasonal averages. By Sunday and Monday we should begin to see high level clouds move into the region from the north. This will be signs of the ridge fattening and zonal flow returning with light the potential for light rain by Monday, especially across the North Bay and as far south as the Bay Area. Chances linger at times through much Friday. Again, rainfall amounts are currently forecast to be light and not amount to much more than 0.25" through next Friday (again for the Bay Area and points northward). Little to no rainfall (outside of the Santa Cruz Mountains) is expected across the Central Coast and Santa Clara Valley.
From the previous forecaster: "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."
(06z TAFS) Issued at 912 PM PST Thu Dec 11 2025
In the North Bay, KSTS is expected to remain IFR/LIFR with both vis and cigs dropping to near minimums, through the overnight and morning, with clearing expected in the early Friday afternoon. KAPC will also hover between IFR/LIFR with low stratus being the primary culprit. Given the persistent pattern, timing should also be similar as past couple of days, with clearing beginning in the early afternoon.
Vicinity of SFO, Light offshore flow will persist through the forecast period with VFR conditions expected to prevail.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, Similar to the Bay Area terminals, light offshore flow is expected to produce VFR conditions through the TAF period.
(tonight through next Wednesday) Issued at 912 PM PST Thu Dec 11 2025
Northerly winds over the coastal waters will continue tonight into early Friday then becoming light and variable with a gradually diminishing northwest swell through the day Friday. Light offshore flow will persist from the Delta to the San Francisco Bay and through the Golden Gate on Friday. Swells continue to gradually diminish through the 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, None.
