FXUS66 KMTR 251759
AFDMTR
Area Forecast Discussion
National Weather Service San Francisco CA
959 AM PST Tue Nov 25 2025
...New AVIATION, MARINE, BEACHES...
.KEY MESSAGES...
Updated at 144 PM PST Mon Nov 24 2025
- Dry and mild conditions continue until the end of the week
- Cooler temperatures this weekend as the next system approaches
- Gusty offshore winds are possible by the end of the upcoming
weekend
&&
.UPDATE...
Issued at 654 AM PST Tue Nov 25 2025
Areas of to widespread dense fog continue to impact the region this
morning especially in the North Bay valleys, East Bay valleys,
southern Salinas Valley and around the Bay Shoreline where we now
have a Dense Fog Advisory through 11 AM PST. Fog is also impacting
the San Francisco Bay, San Pablo Bay, and the West Delta. Some fog
is also being reported in San Jose with visibilities at SJC holding
around 1/2 of a mile. Conditions are forecast to gradually improve
beyond 11 AM, yet anyone driving should use low beam headlines and
slow down to allow extra time to reach your destination when
encountering dense fog. We will continue to monitor the foggy
conditions closely throughout the morning.
RGass
&&
.SHORT TERM...
Issued at 252 AM PST Tue Nov 25 2025
(Today and tonight)
Primary concern in the short term is the dense fog that has
developed overnight across the North Bay Interior Valleys and East
Bay Interior Valleys, and may eventually have to be expanded further
as we head toward and through sunrise. Attm a Dense Fog Advisory is
in effect for the North Bay Interior Valleys and East Bay Interior
Valleys until 11AM this morning.
An offshore surface high pressure under broader ridging aloft is
pulling a weak fetch of offshore flow across much of our area today
and tomorrow. Subsidence beneath the ridge should keep a shallow
marine layer just offshore this afternoon and evening area wide,
resulting in a nice day. Todays temperatures will be similar to
yesterday for the North Bay and Bay Area, slightly warmer for inland
areas over the Central Coast where morning fog won't be as
extensive. Patchy dense fog is expected to develop once again later
tonight into the overnight hours over the North Bay Interior
Valleys, however coverage should decrease as drier air associated
with the shifting ridge mixes closer to the surface.
&&
.LONG TERM...
Issued at 252 AM PST Tue Nov 25 2025
(Wednesday through Monday)
Gradual warming through the middle of the week remains on track with
temperatures peaking on Thursday afternoon while a progressive
trough to our north continues to quickly get deflected north and
east of our area. Weak amplified ridging aloft over the Pacific
Northwest on Friday won't stop a weak back door cold front from
pushing south through our area during the day Friday, cooling most
areas off by a few degrees. The forecast for the weekend and
beyond lacks consensus, but cooler temperatures than what we'll
see the next few days seems likely as the longwave synoptic
pattern becomes highly amplified, allowing for cooler Canadian air
to filter south across the entire West Coast.
&&
.AVIATION...
(18Z TAFS)
Issued at 940 AM PST Tue Nov 25 2025
Dense fog conditions impacts portions of the Bay Area, but
fortunately trends on obs/satellite show a gradual improvement.
Expecting mainly VFR this afternoon with some haze possible.
Tonight will be lower confidence forecast as guidance is all over
the place with suggestion dense fog again, while others shows
drier boundary layer is less chance for fog. That being said, did
bring some fog back in for N and E Bay with less chance for SF Bay
and S Bay. Some of the hi-res guidance enhances low level
offshore flow with drier
Vicinity of SFO...CIGs/Fog conditions to improve across the Bay
with VFR developing. VFR expected this afternoon with VRB to
lighter NE flow with Onshore after 00Z.
SFO Bridge Approach...Some cigs linger over approach. Expecting
clearing by this afternoon.
Monterey Bay Terminals...MRY VFR and SNS will be VFR shortly as
morning fogs/cigs clear.
&&
.MARINE...
(Today through Sunday)
Issued at 940 AM PST Tue Nov 25 2025
Gentle to moderate northerly breezes will prevail through mid week
as high pressure remains over the coastal waters. Patchy dense fog
will be possible again tonight, 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...Beach Hazards Statement until 10 AM PST this morning for CAZ006-
505-509-529-530.
Dense Fog Advisory until 11 AM PST this morning for CAZ506-516.
PZ...None.
&&
$$
SHORT TERM...JM
LONG TERM....JM
AVIATION...MM
MARINE...MM
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Prepared by Boulder-Creek.com Weather at: Tue Nov 25 10:30:03 PST 2025
From the National Weather Service
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