, Issued at 1226 AM PST Mon Nov 24 2025 (Today and tonight)
The stratus layer envelops most of the Bay Area valleys and extends in to the Monterey Bay and Salinas Valley regions, with the expectation that the layer continues to build through the night somewhat undercut by the clearing of the Santa Rosa Plain. Will monitor how the stratus evolves through the night, but will hold firm on seeing a general expansion of the stratus layer through the rest of the morning. A more pressing question will be how dense fog evolves through the next several hours. At this point the only station that has consistently reported dense fog (1/4 mi visibility or less) is Byron in the southeastern corner of Contra Costa County, with trends across the Central Valley suggesting that dense fog is also present across the eastern tier of Contra Costa County (east of the Diablo Hills, including the Antioch area). Fog has also been reported across other regions of the Bay Area, including Concord and Novato, but we have not seen the widespread dense fog anywhere that would trigger a Dense Fog Advisory. If observations show more widespread fog development, one may need to be issued later this morning. For those morning commuters who do encounter dense fog, slow down, use low-beam headlights, and allow extra distance between you and the car in front of you. In any case, stratus should begin to dissipate sometime after sunrise and be generally cleared out by the afternoon.
The weather pattern remains largely similar to yesterday's with a weak ridge aloft and a gentle onshore flow this afternoon. High temperatures range from the middle to upper 60s in the inland valleys to the upper 50s to middle 60s across the coastal and Bayside regions.
..issued at 1226 AM PST Mon Nov 24 2025 (Tuesday through Sunday)
A building ridge aloft brings a gradual warming trend for Tuesday into Thanksgiving (Thursday), compressing the marine layer and raising temperatures by a few degrees, with the rise in temperatures somewhat balanced out by some cold air advection stemming from an interaction between a building high in the east Pacific and a building low in the Desert Southwest. The warmest spots of the inland valleys (think the Morgan Hill-Gilroy region and the southern Salinas Valley) might touch the lower 70s on Wednesday and Thursday.
Towards Friday into the upcoming weekend, a pattern change will occur as the ridge over the western United States breaks down, and one amplifies upstream across the Gulf of Alaska. As a result, cold Arctic air descends into the Mountain West and Central Plains states. Ensemble model guidance continues to point to this system following more of an inside slider like development in our region. In other words, the impacts of this trough fall into the windy and dry side rather than the rainy side. Still too early to tell how strong the impacts will be and where the greatest threats will occur, but the current forecast has a period of gusty offshore winds developing across the Bay Area and Central Coast late Saturday through, and somewhat beyond, the end of the 7-day forecast period. Confidence in the exact nature of the impacts will improve through the rest of the week, so keep in touch with the forecast updates for the most up to date information.
(12z TAFS) Issued at 332 AM PST Mon Nov 24 2025
Low level stratus has filled in across the interior valleys, along with patchy dense fog across portions of the North Bay, including KSTS which is expected to remain LIFR/IFR until clearing out later this morning.
Vicinity of SFO, Weak surface meso low/otter eddy over the Bay Area combined with weak onshore flow just above the marine layer has resulted in some drier air mixing closer to the surface and less coverage than we saw 24hrs ago. MVFR ceilings are expected to persist through sunrise before clearing out by late morning/early afternoon.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, Low level stratus has filled in over the Salinas Valley and is expected to persist with IFR ceilings through mid-morning, then VFR for the remainder of the day and evening. A transition to weak onshore flow today will bring MVFR/IFR ceilings back late tonight into early Tuesday morning.
(today through Saturday) Issued at 332 AM PST Mon Nov 24 2025
Seas have begun to ease and will continue to do so through the middle of the week as high pressure build across our area. Expect light to moderate northerly breezes through early Thursday. By the end of the week into next weekend, winds will begin to increase along with building seas.
Issued at 614 PM PST Sun Nov 23 2025
A Beach Hazards Statement is in effect through Monday evening. A long period northwesterly swell will result in an increased risk for sneaker waves and rip currents. Breaking waves of 13 to 18 feet are expected. Sneaker waves can unexpectedly run significantly farther up the beach than normal, including over rocks and jetties. Rip currents are typically more frequent and stronger in the vicinity of jetties, inlets, and piers.
Ca, Beach Hazards Statement through this evening for CAZ006-505-509- 529-530.
PZ, None.
