Issued at 816 PM PST Thu Nov 27 2025
Not much to update on tonight. Fog is creeping into the East Bay and North Bay valleys, but the temperature fluctuations from high clouds moving into the area along a weak boundary could cause some interruptions in fog formation further into the night. However, the overall fog chances remain strong for those areas, and any interruptions will be shot lived.
-Murdock
, Issued at 1235 PM PST Thu Nov 27 2025 (This evening through Friday)
~gobble gobble~
Sun for most and really frustrating stratus and Tule fog for a few others. Forecast today remains mostly on track, except temperatures in the North Bay and inland East Bay where I've lowered high temps to account for the lingering fog and stratus. Notable places like Santa Rosa, Napa, and Livermore have barely broken 50 degrees as of 1-2pm. This pattern is likely to persist into tomorrow.
..issued at 1235 PM PST Thu Nov 27 2025 (Friday night through next Wednesday)
The persistence forecast is a good bet for the next few days as a very high amplitude ridge builds into the Gulf of Alaska and promotes downstream troughing into the continental US. This pattern results in light offshore flow for our region, which will mostly keep temps mild and skies mostly dry. On that note, there is no precipitation in our forecast through the next seven days.
(06z TAFS) Issued at 948 PM PST Thu Nov 27 2025
Satellite and cameras show a more expansive fog/stratus bank moving across the interior. Ceiling heights are slightly higher so far tonight (IFR compared to LIFR) but should drop after a weak frontal boundary passes through. Moderate to high confidence in fog at STS, APC, and LVK with potential for decreases in visibility at the rest of the Bay Area airports. Going off of persistence, fog and stratus are likely to clear between 18Z-20Z with guidance showing similar clearing times for tomorrow. Winds generally stay offshore through the TAF period but briefly turn onshore during the daytime. Fog and stratus is likely to return just after the end of this TAF period.
Vicinity of SFO, Moderate potential for fog/stratus to reach SFO early tomorrow morning. Current satellite imagery shows a more expansive fog/stratus deck than was originally forecast - this is increasing confidence that lower visibilities will at least temporarily impact SFO overnight. Bumped up the arrival timing of lowered visibilities from 12Z to 10Z given the faster expansion of fog this evening, otherwise no major changes to the forecast. Moderate onshore winds return during the day, otherwise, winds stay offshore through much of the period.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, VFR. Some potential for MVFR CIGs along the coastline but confidence is low that they'll extend inland and reach MRY/SNS. If they did extend inland, the most likely times for MVFR CIGs would be between 12Z-18Z.
(tonight through next Wednesday) Issued at 816 PM PST Thu Nov 27 2025
Moderate north to northeasterly winds continue through Friday as a weak front moves through the northern waters. Localized fresh winds are expected south of Point Pinos tonight into Saturday. Winds will decrease early Saturday before increasing late Saturday into early next week. Hazardous marine conditions return midweek as a cut-off low moves through the coastal waters with winds increasing and wave heights building due to incoming long period westerly swell.
Ca, None. PZ, Small Craft Advisory from 9 AM to 9 PM PST Friday for Pigeon Pt to Pt Pinos 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm.
