FXUS66 KMTR 050553
AFDMTR
Area Forecast Discussion
National Weather Service San Francisco CA
953 PM PST Thu Dec 4 2025
...New AVIATION, MARINE...
.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
&&
.UPDATE...
Issued at 909 PM PST Thu Dec 4 2025
The forecast remains on track tonight. A slow and gradual warming
trend sets in through the middle of next week. However, a Cold
Weather Advisory remains in effect overnight into Friday morning
until 8AM for interior portions of the Central Coast. Some high
cloud coverage is helping to slow down radiational cooling across
the rest of our area, with warmer overnight lows than we've seen
the past couple of nights.
&&
.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...
(06Z TAFS)
Issued at 953 PM PST Thu Dec 4 2025
VFR for most sites but some potential for fog and lowered
visibilities at STS, LVK, and APC. Highest confidence that STS and
LVK will see MVFR to IFR conditions with low to moderate confidence
that APC will see MVFR conditions. A tempo for lowered visibility
may need to be added to APC with guidance showing clouds moving in
and out during the early morning hours. Otherwise, winds remain
light and offshore tonight before a more sustained push of onshore
winds returns by tomorrow afternoon.
Vicinity of SFO...VFR. Winds remain light through tomorrow morning
before moderate onshore winds return during the afternoon/evening
hours.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...VFR. Light, offshore winds continue
overnight with moderate onshore winds returning during the
afternoon/evening. Winds look to weaken and shift offshore again by
tomorrow night.
&&
.MARINE...
(Tonight through next Wednesday)
Issued at 953 PM PST Thu Dec 4 2025
Winds build across the outer and northern inner waters tonight
with fresh to strong gusts expected. Elevated winds with fresh to
strong gusts persist into next week and gradually spread into the
inner waters starting late Saturday. Localized near gale force
gusts are possible across the outer waters through Saturday.
Moderate seas continue with seas building to between 6 to 8 feet
Friday through Sunday.
&&
.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 until 9 AM PST Saturday for Pt Arena to Pt
Reyes 10-60 NM.
Small Craft Advisory from 3 AM Friday to 9 AM PST Saturday for
Pigeon Pt to Pt Pinos 10-60 NM.
&&
$$
SHORT TERM...DialH
LONG TERM....DialH
AVIATION...Kennedy
MARINE...Kennedy
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Prepared by Boulder-Creek.com Weather at: Fri Dec 5 02:30:03 PST 2025
From the National Weather Service
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