textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 303 AM PST Thu Nov 27 2025

- Pleasant Thanksgiving Day area wide

- Cooler temperatures set in for Friday and the remainder of the extended forecast

UPDATE

Issued at 1003 AM PST Thu Nov 27 2025

Just like yesterday the Dense Fog Advisory was cancelled early as visibilities improved across the N and E Bay. However, stills seeing some fog (1-4 miles), just not dense to warrant an advisory. Additionally, widespread clouds blanket the N and E Bay Valleys. It will be a slow clear out for those areas given lack of low level mixing. Elsewhere around the forecast area filtered sunshine with mid-high level clouds passing through. Outside of dealing with clouds and fog, no other updates needed this morning.

SHORT TERM

Issued at 303 AM PST Thu Nov 27 2025 (Today and tonight)

Forecast remains on track for a very pleasant Thanksgiving Day across our area. Portions of the North Bay Interior Valleys and East Bay Interior Valleys (both have a Dense Fog Advisory in effect until 10am PST this morning) may have to wait until later this morning to start basking in the ample sunshine and light winds awaiting most of us for the afternoon and early evening. A weak disturbance to our north weakens H50 heights later today and overnight before amplified ridging is reestablished in the Pacific Northwest.

LONG TERM

Issued at 303 AM PST Thu Nov 27 2025 (Friday through Wednesday)

A relatively weak, dry cold front extending from the aforementioned disturbance tracking out of the Pacific Northwest into the Intermountain West by early Friday will cool our temperatures down to near seasonal averages into the weekend. By late Sunday, the Polar Jet amplifies further with little to no impacts on our ambient weather other than reinforcing the cooler temperatures through the remainder of the extended forecast. The pattern appears to be unsettled for the second half of next week, but consensus in the deterministic guidance that far out has been even more elusive recently than it normally is.

AVIATION

(18Z TAFS) Issued at 1003 AM PST Thu Nov 27 2025

Another challenging morning for aviation with slow clearing of clouds and fog for the N and E Bay. Additionally, another pesky finger of clouds impacts SFO with a slow clearing there too. IFR conditions will linger for the N and E Bay into the afternoon. Other terminals will be VFR to MVFR (haze/br). For tonight, took a blend of HRRR lo clouds and persistence from the last few nights. Expect another night of IFR to MVFR most areas. Overall conf is low to medium.

Vicinity of SFO...IFR cigs through 1830-19Z then VFR. Will bring IFR cigs back late tonight with a 60-70% conf.

SFO Bridge Approach...Similar to SFO with cigs over the approach through 19Z.

Monterey Bay Terminals... VFR.

MARINE

(Today through Tuesday) Issued at 1003 AM PST Thu Nov 27 2025

A weak dissipating cold front will enter the coastal waters later today. As such, moderate to fresh northerly winds will develop lasting into Friday. Winds will decrease Saturday but pick up to a moderate to fresh north breeze on Sunday, with lighter winds expected for the early part of next week.

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...Small Craft Advisory from 9 AM to 9 PM PST Friday for Pigeon Pt to Pt Pinos 0-10 nm.

Small Craft Advisory from 9 PM this evening to 9 PM PST Friday for Pt Pinos to Pt Piedras Blancas 0-10 nm.

Small Craft Advisory from 3 PM this afternoon to 9 AM PST Friday for Pt Arena to Pt Reyes 10-60 NM.

Small Craft Advisory from 3 PM this afternoon to 9 PM PST Friday for Pigeon Pt to Pt Pinos 10-60 NM.