003
FXUS66 KMTR 041940
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1140 AM PST Thu Dec 4 2025

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

.KEY MESSAGES...
Updated at 1139 AM PST Thu Dec 4 2025

 - Persistent forecast through the next seven days with benign
   conditions and no precipitation expected

 - Hazardous cold conditions continue in the interior Central
   Coast Friday morning

 - Impacts from Tule Fog continue in the interior East Bay

&&

.SHORT TERM...
Issued at 1139 AM PST Thu Dec 4 2025
(This afternoon through Friday)

Satellite imagery shows lingering stratus in the interior East Bay,
an outgrowth of the Tule Fog across the Central Valley, and the very
southern portion of the Salinas Valley. Isolated patches of higher
clouds are scattered across the region. The general weather pattern
continues to be dominated by ridging in the eastern Pacific, which
has been edging into the western United States after a trough pulled
away into the Central United States. The large scale flow continues
to come from the north, and generally mild offshore flow persists
across the higher elevations of the Bay Area, although as the
offshore gradient begins to significantly weaken, the offshore flow
will likewise decrease. Expect another round of Tule Fog impacts
tonight into Friday morning, mainly across the interior Bay Area
with potential impacts in the North Bay valleys.

Highs today range from the upper 50s to the middle 60s across the
lower elevations, except in the interior East Bay where highs remain
in the lower 50s. A Cold Weather Advisory remains in effect for the
interior Central Coast, including the southern Salinas Valley, for
the midnight to 8 AM timeframe on Friday morning, as lows reach the
lower to middle 30s generally and down into the 20s for isolated
locations in the higher elevations. Elsewhere, lows range from the
lower to middle 40s in the lower elevations, reaching into the upper
40s in the higher elevations. Temperatures in the interior East Bay
are expected to warm slightly tomorrow into the lower 60s, while the
rest of the region sees highs around 1 to 2 degrees warmer than
today`s.

&&

.LONG TERM...
Issued at 1139 AM PST Thu Dec 4 2025
(Friday night through next Wednesday)

The forecast conditions remain so stable that a lot of my discussion
from yesterday still applies. We are still expecting the ridging to
build into the southwestern US, promoting a gradual warming trend
through the early part of next week with the inland valleys reaching
the upper 60s to middle 70s. We are still expecting a couple of
storm systems to get deflected into the Pacific Northwest and leave
us with offshore showers, potential light drizzle in the Sonoma
coastal ranges, and disappointment for fans of wet weather
everywhere else. We are still seeing the next chance for widespread
rain towards the middle of the month with very high levels of
uncertainty for that part of the forecast.

&&

.AVIATION...
(18Z TAFS)
Issued at 942 AM PST Thu Dec 4 2025

VFR trough the TAF period, with the exception of KLVK which is
currently IFR this morning and forecast to improve to VFR by early
afternoon. Light to moderate offshore winds prevail this morning
before becoming north-northwesterly this afternoon across the Bay
Area and Monterey Bay terminals. Friday morning, there is a low
probability (less than 25% chance) of LIFR ceilings and/or
visibilities for KSTS. Winds diminish overnight with greater
probability of onshore winds by Friday afternoon.

Vicinity of SFO...VFR through the TAF period. Offshore winds
prevail this morning and are expected to become north-
northwesterly by mid- to-late afternoon. Winds diminish overnight
with greater probability of onshore winds by Friday afternoon.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR through the TAF period. Light to
southerly winds prevail this morning and are forecast to become
onshore by early-to-mid afternoon. Winds diminish overnight and
become southerly early Friday morning.

&&

.MARINE...
(Today through Tuesday)
Issued at 831 AM PST Thu Dec 4 2025

Winds are diminishing and seas are subsiding. Expect mostly calm
conditions into the night before breezy to gusty northwest winds
return with rebuilding seas up to 8 feet by Friday. Winds stay
breezy into the next work week, but seas abate in the early week.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Coastal Flood Advisory until 3 PM PST Sunday for CAZ006-506-508-
     529-530.

     Cold Weather Advisory until 8 AM PST Friday for CAZ516-518.

PZ...Small Craft Advisory from 9 AM Friday to 3 AM PST Saturday for
     Pt Arena to Pt Reyes 0-10 nm.

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

     Small Craft Advisory from 3 AM Friday to 3 AM PST Saturday for
     Pigeon Pt to Pt Pinos 10-60 NM.

&&

$$

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

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