335
FXUS66 KMTR 100952
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
152 AM PST Mon Nov 10 2025

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

.KEY MESSAGES...
Updated at 151 AM PST Mon Nov 10 2025

 - Warm and dry conditions through Tuesday

 - Unsettled weather pattern returns middle of next week through
   the weekend

 - Moderate rain, strong southerly winds, and a slight chance for
   thunderstorms late Wednesday through Thursday

&&

.SHORT TERM...
Issued at 151 AM PST Mon Nov 10 2025
(Today and tonight)

There is a southerly surge in place along the coast, but knowing
exactly how far north it has gone is impossible to determine as high
clouds block the satellite imagery north of Monterey Bay. The
weather station at Marina reported fog earlier tonight, Watsonville
reported fog yesterday evening, but Half Moon Bay has not reported
fog at any point so far tonight. This southerly surge will bring the
potential for fog to the immediate coastal regions. Drivers along
the Pacific coast south of the Golden Gate should be aware of
potential rapid changes in visibility. If caught in dense fog, slow
down, use low-beam headlights, and leave extra space in front of you.

For the rest of the region, high clouds tonight will limit
radiational cooling over the Bay Area, and combined with light
offshore flow in the higher elevations, will keep the low
temperatures this morning slightly warmer than yesterday at around
the middle to upper 50s. The interior Central Coast remains clear
and the Salinas Valley could see lows dip into the lower 50s. In the
higher elevations, the thermal belts remain active with lows in the
lower to middle 60s. One more day of warm and dry conditions is
expected today, with highs around 10 to 20 degrees above seasonal
averages away from the immediate coast. Forecast highs are in the
lower to middle 80s across the inland valleys, with the warmest
spots of southern Salinas Valley and the Morgan Hill-Gilroy area
reaching the upper 80s, the upper 70s to the lower 80s near the
Bays, and the upper 60s to lower 70s near the Pacific coast.

&&

.LONG TERM...
Issued at 151 AM PST Mon Nov 10 2025
(Tuesday through Sunday)

On Veteran`s Day (Tuesday), the upper level ridging responsible for
the warm temperatures begins to erode and shuffle to the east,
starting a cooling trend that will bring highs down around 2 to 5
degrees across the region, with the most pronounced cooling at the
coastal areas. This still leaves the highs anywhere between 5 to 15
degrees above seasonal averages across the region. Given the rest of
the forecast involves unsettled weather, Tuesday is really the last
day to make any preparations to prevent roadway flooding or water
damage.

By Wednesday, a deep upper level trough permits a corridor of
subtropical moisture to develop and approach the state of
California. Yes my friends, this is an atmospheric river, but we
aren`t expecting days of intense rainfall. The really intense
rainfall from this system is expected to come through late on
Wednesday into Thursday, this being the time that the main rain band
with the subtropical tap comes through the region. We are at the
stage where we could start talking about lower confidence rainfall
totals for the region. The initial estimates suggest that the Bay
Area should see and Monterey Bay region should receive around an
inch to an inch and a half of rainfall, with less rainfall within
the rain shadowed valleys (perhaps significantly less rainfall),
while the coastal ranges lean towards rain totals from 1.5 to 3
inches. Southerly winds will also increase as the storm approaches,
and although the exact details are still to be refined, widespread
gusts of 30 to 40 mph are possible with stronger gusts along the
coast and at the higher elevations, especially through favored gaps
and passes. We are also maintaining a 10-15% chance of thunderstorms
as the main rain band passes through Wednesday night into Thursday.
The ECMWF and GFS models are putting K-Index values of 30 to 35
degrees Celsius, suggesting that scattered thunderstorms are
possible. Over the next couple of days, high resolution mesoscale
models will start to capture the system, and they will really help
us narrow down the details of the incoming storm. This is especially
critical in our part of the world, where the local terrain can
significantly influence the weather impacts, terrain that is very
often smoothed out in the global weather models.

Lingering showers continue after the main rain band passes through
Friday before a lull in the rain on Saturday. A second trough will
bring another period of rain chances next Sunday into the early part
of the following week, with the details way too early to be teased
out at this time. Through all of this, the temperatures will drop
like a stone on Wednesday, bottoming out at the middle 50s to lower
60s for the lower elevations on Thursday and Friday.

&&

.AVIATION...
(06Z TAFS)
Issued at 919 PM PST Sun Nov 9 2025

Ample high clouds streaming overhead making it hard to track the
progress of the southerly surge. Have delayed CIGS for KHAF and
KSNS as they have not materialized yet. Elsewhere, VFR with
diurnal winds developing and drier offshore flow. KMRY,KSNS,KHAF
have the best chance for cigs tonight and early Monday. Nailing
down wind direction is lower confidence given the lack of
stronger synoptic forcing.

Vicinity of SFO...Light winds with high clouds. Stronger onshore
push Monday afternoon.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Lower cigs have entered MRY Bay, but not
making it inland just yet. High clouds may be limited cool and
inland intrusion of clouds. When clouds do move inland they`ll be
shallow with low cigs likely under 1k feet.

&&

.MARINE...
(Tonight through next Saturday)
Issued at 919 PM PST Sun Nov 9 2025

Southerly flow continues to surge north along the Central coast
bringing low clouds and locally dense fog with shifting  winds.
Areas of north of the Golden Gate will remain light to  moderate
winds and out of the north. Southerly surge ends Monday  with
northerly flow all waters. Unsettled weather returns midweek  with
increasing southerly winds. These winds, combined with a  building
NW swell, will generate rough seas across the waters.  Winds are
expected to decrease Friday, but the larger swell  continues to
build with seas up to 15 feet before diminishing  through the
weekend.

&&

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

$$

SHORT TERM...DialH
LONG TERM....DialH
AVIATION...MM
MARINE...MM

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