FXUS66 KMTR 192335
AFDMTR
Area Forecast Discussion
National Weather Service San Francisco CA
335 PM PST Mon Jan 19 2026
...New AVIATION, MARINE...
.KEY MESSAGES...
Updated at 1230 PM PST Mon Jan 19 2026
- Dry weather, cool mornings, and mild afternoons this week
- Morning fog across the Delta, North Bay Valleys, and interior
East Bay Valleys
&&
.SHORT TERM...
Issued at 1230 PM PST Mon Jan 19 2026
(This evening through Tuesday)
Very little change in day to day conditions anticipated through mid
week. A ridge of high pressure remains just off of the Pacific coast
that will continue to result in temperatures 5-10 degrees above
average (up to 15 in the higher terrain). Overnight, we are
expecting patch to areas of fog in the North Bay Valleys while tule
fog (dense at times) is forecast to advect westward into the
interior East Bay Valleys and Delta again either late tonight or
into Tuesday morning. If driving or commuting in these areas; be
aware of the potential for dense fog and be prepared for sudden
changes in visibility, remember to slow down, and use your low beam
headlights.
Expecting a slight cool down on Tuesday as more widespread high
clouds stream over the region, but only by a few degrees. Where
mostly sunny sky conditions prevail, afternoon temperatures will
warm into the mid 60s to lower 70s across the Central Coast and low
to mid 60s elsewhere. That said, where fog lingers into late morning
or early afternoon, expecting temperatures to only reach the upper
50s.
&&
.LONG TERM...
Issued at 1230 PM PST Mon Jan 19 2026
(Tuesday night through next Sunday)
Dry conditions look to persist through much of the extended
forecast. An upper level trough will develop over the north central
Pacific between Tuesday night and Wednesday. A cut-off low will
develop within that trough and move southward just off of the Bay
Area/Central Coast, resulting in slightly cooler conditions and
cloudier skies through late week. Thus, the greatest potential for
rain will be across southern California and along the Santa Lucia
Range on Thursday as a deeper plume of moisture advects inland to
the south. However there is about a 20% probability of seeing
greater than 0.01" and less than a 10% chance of that area seeing
0.10" over that area.
A weak upper level ridge is forecast to develop by this weekend and
into early next week. As a result, a slight warming trend is
forecast, but not as warm as what we have been the past week. Longer
range guidance continues to push back our next potential widespread
rainfall. It is not until late January or early February that we
forecast widespread rain to return to the region.
&&
.AVIATION...
(00Z TAFS)
Issued at 324 PM PST Mon Jan 19 2026
VFR is expected to prevail for all terminals except KSTS where
valley fog is expected to develop late tonight and persist
through late morning Tuesday. Otherwise, we'll see light winds and
drifting high clouds from south to north.
Vicinity of SFO...VFR is expected to prevail through the forecast
period with low confidence, low chance of MVFR stratus in
vicinity of KOAK and KSFO overnight into earl Tuesday morning.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...VFR is expected to prevail through the
forecast period with increase in offshore winds Tuesday morning
through the remainder of the day.
&&
.MARINE...
(Tonight through next Saturday)
Issued at 324 PM PST Mon Jan 19 2026
Light northerly breezes will continue through the middle of the
week and begin to gradually increase by the end of the work week
into next weekend across our northern outer waters. A weak upper
level disturbance will result in a subtle increase in
northwesterly swell to moderate both Wednesday and Friday, quickly
easing again into the weekend.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.
&&
$$
SHORT TERM...RGass
LONG TERM....RGass
AVIATION...JM
MARINE...JM
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Prepared by Boulder-Creek.com Weather at: Mon Jan 19 16:30:03 PST 2026
From the National Weather Service
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