405
FXUS66 KMTR 012334
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
334 PM PST Mon Dec 1 2025

...New AVIATION, MARINE...

.KEY MESSAGES...
Updated at 145 PM PST Mon Dec 1 2025

 - Less fog and stratus today, even less tomorrow.

 - Inside slider promotes gusty offshore flow Wednesday morning
   across North Bay, Bay Area, and Santa Cruz Mtns. Gusts to 45
   mph possible in higher terrain. Limited fire weather concern
   thanks to high fuel moisture.

 - Quiet and dry after midweek into the weekend. Still looking
   like the next chance for a meaningful pattern change is around
   the middle of the month.

&&

.SHORT TERM...
Issued at 145 PM PST Mon Dec 1 2025
(This evening through Tuesday)

Less cloudiness for most places today thanks to a weak upper level
disturbance and a light push of offshore winds overnight. This
helped dry the low-to-mid levels and provide enough mixing aloft
to aid in a quicker clearing to clear skies today. Some areas
still holding on to fog and low clouds in far eastern Contra Costa
and Alameda counties bordering the central valley. We can expect
this trend to continue into Tuesday with dryer and in place,
resulting in temps a couple of degrees warmer than today.

&&

.LONG TERM...
Issued at 145 PM PST Mon Dec 1 2025
(Tuesday night through next Sunday)

By Tuesday night we`ll start to see a deep upper low digging into
the Great Basin in what appears as an inside slider. Surface high
pressure building in northern NV in the wake of this system
promotes a strong offshore oriented pressure gradient that will
result in gusty offshore winds. Winds set to increase going into
Tuesday night, increasing through early Wednesday morning and
peaking sometime by noon Wednesday. We`re anticipating NE winds
25-35 mph with potential gusts to 40 mph across the North Bay,
East Bay Hill, and Santa Cruz Mtns. Some potential for isolated
gusts to 50 mph along the higher ridgetops of the interior North
Bay. Things will certainly dry out with this burst of offshore
flow, but we aren`t expecting RH to get below the 30-40% range for
most. Isolated areas at highest elevations in the interior North
Bay may see RH as low as 25-30% Wednesday. Despite the gusty and
dry conditions, fuel moisture should mitigate most fire weather
concerns thanks to productive rainfall in early November. Beyond
the middle of the week, things look much quieter and a return to a
benign pattern with the ridiculously resilient ridge (RRR)
dominating through the weekend.

&&

.AVIATION...
(00Z TAFS)
Issued at 333 PM PST Mon Dec 1 2025

IFR-MVFR stratus lingers in the interior East bay, especially east
of the Diablo Range, through the next few hours fueled by dense
stratus across the Central Valley. VFR conditions with thin high
clouds, almost like an elevated haze, prevail everywhere else with a
generally gentle offshore flow across the region. Winds will
diminish overnight, and radiational fog and stratus development is
possible in the inland valleys and the interior East Bay. The nature
of radiational fog development makes it very hard, almost
impossible, to forecast the exact extent, but the highest
probability of impact seems to be across the North and East Bay
valleys, with some possibilities of development near SFO as well.
Stratus will dissipate through Tuesday morning with a gentle onshore
flow developing Tuesday afternoon.

Vicinity of SFO... Low confidence of MVFR-IFR stratus developing
Tuesday morning, covered by a TEMPO group in the current TAF. Gentle
southeast flow will continue through the evening hours, with light
winds overnight before onshore flow resumes Tuesday afternoon.

SFO Bridge Approach... Similar to SFO.

Monterey Bay Terminals... VFR through the TAF period. Winds remain
relatively light throughout, with generally onshore flow during the
day before turning to a drainage flow overnight.

&&

.MARINE...
(Tonight through next Saturday)
Issued at 333 PM PST Mon Dec 1 2025

Moderate to fresh northerly breezes and moderate to rough seas
will  prevail through Tuesday morning. Hazardous marine conditions
return  Tuesday afternoon as northerly breezes increase to become
fresh to  strong and seas become rough to very rough. Gale fore
gusts will be  possible across the far northern outer waters on by
Tuesday  afternoon. Conditions improve Thursday with moderate
northerly  breezes and moderate seas.

&&

.BEACHES...
Issued at 1014 AM PST Mon Dec 1 2025

Hazardous beach conditions will continue into Wednesday evening with
a very energetic surf zone. A beach hazards statement remains in
effect for the coastline from Sonoma County to Monterey County
through 10 PM PST Wednesday evening. Breaking waves 10 to 14 feet,
with long lulls of 10 to 20 minutes or more between largest sets can
be expected. Some of the favored break points may exceed 20 feet at
times. Forerunners will be 18+ seconds with heights of 2-5 feet into
tonight resulting in the greatest risk for sneaker waves. This
combined with high astronomical tides in the morning hours will
increase the aforementioned risk. Sneaker waves can unexpectedly run
significantly farther up the beach than normal, including over rocks
and jetties. Rip currents are typically more frequent and stronger
in the vicinity of jetties, inlets, and piers.

RGass

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through Wednesday evening for CAZ006-505-
     509-529-530.

     Coastal Flood Advisory from 6 AM Tuesday to 3 PM PST Sunday for
     CAZ006-506-508-529-530.

PZ...Small Craft Advisory from 3 PM Tuesday to 3 AM PST Wednesday for
     Pt Arena to Pt Reyes 0-10 nm.

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

     Gale Warning from 3 PM Tuesday to 3 AM PST Wednesday for Pt
     Arena to Pt Reyes 10-60 NM.

     Small Craft Advisory from 9 PM Tuesday to 3 AM PST Wednesday for
     Pigeon Pt to Pt Pinos 10-60 NM.

&&

$$

SHORT TERM...Behringer
LONG TERM....Behringer
AVIATION...DialH
MARINE...RGass

Visit us at www.weather.gov/sanfrancisco

Follow us on Facebook, X, and YouTube at:
www.facebook.com/nwsbayarea
x.com/nwsbayarea
www.youtube.com/nwsbayarea