FXUS66 KMTR 090024
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
424 PM PST Mon Dec 8 2025

...New AVIATION...

.KEY MESSAGES...
Updated at 243 PM PST Mon Dec 8 2025

 - Tule fog and stratus return tonight for Bay Area valleys. 

 - Quiet and benign weather this week.

 - Next chance for rain is around December 15. 

&&

.SHORT TERM...
Issued at 243 PM PST Mon Dec 8 2025
(This evening through Tuesday)

The stagnant pattern continues with the story being cloudy 
conditions returning tonight for areas that cleared around the Bay 
Area and clear conditions for much of the Central Coast. This should 
keep low temperatures generally in the 40s for Bay Area counties and 
Santa Cruz County. Elsewhere in the Central Coast, lows will vary 
from the upper 30s to low 40s for the interior portions, while c 
coastal areas sit closer to the mid 40s. A new forecast challenge
also arrives for tonight as temperatures were a bit chillier than
expected last night for the northern Salinas Valley and along the
coast of the southern Monterey Bay area. For now kept NBM in for 
the lows; however, should temps drop like last night they may need
to be adjusted a few degrees cooler. 

&&

.LONG TERM...
Issued at 243 PM PST Mon Dec 8 2025
(Tuesday night through next Sunday)

High pressure holds through the week, leading to dry conditions 
through the weekend. Temperatures should warm by mid week, before 
cooling a bit again over the weekend. The next chance for rain looks 
to be around December 15, where the NBM favors the best chances of 
rain around the North Bay with a 15-20% expanding to the East and 
South Bay counties and into Santa Cruz County. Ensembles do show the 
ridge flattening some which could allow a front to make it into the 
region. The details will likely change, so stay tuned. 

&&

.AVIATION...
(00Z TAFS)
Issued at 423 PM PST Mon Dec 8 2025


Low clouds and fog have receded from all TAF Sites but lingers in 
portions of the  North Bay and interior East Bay. Expect cloud cover 
fill back over STS, APC and LVK into the evening and lower further 
into the night while the fog rebuilds and becomes thicker. SFO and 
SJC see CIGs arrive in the late night with some slight reductions in 
visibilities. Winds stay mostly light to moderate through the 
morning, with wind directions determined by more localized affects. 
Cloud cover and fog will be slow to erode into Tuesday afternoon, 
but conditions look to improve into the late afternoon. However, the 
North and East Bay will continue to struggle with low clouds and 
fog, causing some doubt for clearing at APC . As cloud cover erodes, 
pockets of haze will affect much of the region.

Vicinity of SFO...VFR lasts into the late night. Winds become 
lighter into the night with scattered low clouds building into the 
area, along with some slight reduction in visibilities. IFR level 
CIGs fill into the late night with some weak northeasterly winds. 
Cloud cover thins into the afternoon, but winds stay light.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR through the TAF period. Winds stay 
light for MRY through the TAF period, while SNS sees moderate 
northwest winds become light and southeasterly into the night. North 
to northwest winds return Tuesday afternoon with the potential for 
haze.

&&

.MARINE...
(Tonight through next Saturday)
Issued at 243 PM PST Mon Dec 8 2025

Northerly flow remains due to high pressure off the California
coast with moderate winds and locally fresh winds south of Point
Sur. Winds increase to a strong breeze Tuesday into mid week
across the outer waters. A new, long period northwesterly swell is
expected by midday Wednesday, lasting through the latter half of
the week.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 9 PM PST Tuesday for Pt Pinos to Pt 
     Piedras Blancas 0-10 nm.

&&

$$

SHORT TERM...KR
LONG TERM....KR
AVIATION...Murdock
MARINE...MM

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Prepared by Boulder-Creek.com Weather at: Mon Dec 8 20:30:02 PST 2025