587
FXUS66 KMTR 252121
AFDMTR

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

...New SHORT TERM, LONG TERM...

.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...
(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...None.
PZ...None.
&&

$$

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

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