FXUS66 KMTR 260009
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
409 PM PST Tue Nov 25 2025

...New AVIATION, MARINE...

.KEY MESSAGES...
Updated at 120 PM PST Tue Nov 25 2025

 - Dry and mild conditions continue through Thursday 

 - Cooler temperatures Friday and into the weekend as the next 
   system approaches

 - Gusty offshore winds are possible by the end of the weekend and 
   into early next week

&&

.SHORT TERM...
Issued at 120 PM PST Tue Nov 25 2025
(This evening through Wednesday)

Low clouds persist over the North Bay and East Bay, yet are forecast 
to begin clearing later this afternoon. However, if they do not, 
temperatures will be cooler than currently forecast by up to 10 
degrees. Elsewhere, temperatures are forecast to reach into the 60s 
across most inland areas while the immediate coastal areas of the 
North Bay and San Francisco Peninsula remain in the mid-to-upper 
50s. 

As offshore flow persist in the higher elevations across the region, 
the marine layer remains compressed. Thus, there is greater 
probability for less coverage of fog overnight. However, still 
expecting patchy to areas of dense fog across the North Bay valleys, 
East Bay valleys, and the Santa Clara Valley overnight. Temperatures 
overnight are forecast to be mostly in the 40s with the coldest 
interior spots potentially lowering into the upper 30s. 

As the ridge axis shifts eastward into southern California, 
temperatures will continue to warm on Wednesday. This is when we are 
expecting temperatures across the interior Central Coast, Santa Cruz 
area, southern Santa Clara and Hollister valleys, and far inland 
North Bay valleys to reach or exceed 70 degrees F. These 
temperatures will be up to 10 degrees above seasonal averages. 
Again, similar to today, areas that do not see afternoon sunshine 
will likely be a few to several degrees cooler. 

&&

.LONG TERM...
Issued at 120 PM PST Tue Nov 25 2025
(Wednesday night through next Monday)

On Thursday, an upper level trough is forecast to approach the 
Pacific Northwest brining unsettled weather to that area. Locally, 
we are forecast to see similar temperatures as Wednesday for daytime 
highs. By Friday, this feature will shift into the northern part of 
the Intermountain West, thus cooling temperatures to near seasonal 
averages as a weak, dry back door cold front sweeps across the Bay 
Area and Central Coast. A reinforcing trough will drop out of 
British Columbia and act as an inside slider setup as in drops 
southward across the Intermountain West. This would lead to gusty 
offshore winds across our region. However, exact details reamin 
difficult to pin down at this time as there remains uncertainty this 
far out. Be sure to check back and keep up-to-date with the latest 
forecast information. 

&&

.AVIATION...
(00Z TAFS)
Issued at 409 PM PST Tue Nov 25 2025

Currently VFR everywhere except STS where localized overcast 
conditions are continuing to clear. Moderate confidence that fog 
will return tonight with visibilities as low as 1/4SM. The most 
likely airports to receive fog are STS, APC, and LVK with SFO, OAK, 
and SJC having slightly lower chances. Guidance does show some drier 
air mixing in overnight but current thinking is that offshore flow 
will advect fog from the Central Valley into the East Bay and up the 
delta. Kept the general timing the same as in the 18Z TAFs but added 
in at least temporary fog to SJC and SNS. General clearing is 
expected by mid to late morning but may see fog lingering slightly 
longer across the North Bay Valleys. 

Vicinity of SFO...VFR with MVFR conditions overnight. Low to 
moderate confidence that fog will push into the SF Bay and reach 
SFO. If fog does extend to SFO it is most likely to be between 10Z-
17Z with VFR conditions returning after that time. Winds generally 
stay offshore but shift back onshore towards the end of the TAF 
period.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR with some potential for fog to develop 
at SNS early tomorrow morning. Winds stay light at MRY through the 
TAF period but breezy drainage flow is expected to develop at SNS 
during the morning hours. Winds generally switch more offshore 
overnight and remain offshore through the rest of the TAF period.

&&

.MARINE...
(Tonight through next Monday)
Issued at 409 PM PST Tue Nov 25 2025

High pressure over off the California Coast will maintain gentle
to moderate northerly breezes through mid week. Patchy dense fog
will be possible again Tuesday night, especially in the bays.
Seas will gradually ease through the middle of the week. Winds
will begin to increase again late week, building moderate to rough
seas.

&&

.BEACHES...
Issued at 923 AM PST Tue Nov 25 2025

The Beach Hazards Statement has been allowed to expire at 10 AM. 
While the statement expires, the surf zone will be energetic today
so still use caution if you're visiting beaches.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.
&&

$$

SHORT TERM...RGass
LONG TERM....RGass
AVIATION...Kennedy
MARINE...MM

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Prepared by Boulder-Creek.com Weather at: Tue Nov 25 18:30:03 PST 2025