National Weather Service United States Department of Commerce

Snow May Produce Poor Travel Conditions in the North-Central U.S. and East Coast

A strong cold front sweeping across the Northern Plains may bring snow showers and snow squalls from eastern Montana to north-central Nebraska, with blizzard conditions possible in eastern North Dakota and northwestern Montana. Heavy snow is expected to persist downwind of the Great Lakes. Snow showers will spread up the East Coast across the Mid-Atlantic and Northeast coasts. Read More >

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266
FXUS66 KMTR 190109
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
509 PM PST Sun Jan 18 2026

...New AVIATION, MARINE...

.KEY MESSAGES...
Updated at 1251 PM PST Sun Jan 18 2026

- Dry weather, cool mornings, and warm afternoons this week

- Morning fog across the Delta, North Bay Valleys, and interior
East Bay Valleys

&&

.SHORT TERM...
Issued at 1251 PM PST Sun Jan 18 2026
(This evening through Monday)

Temperatures continue to warm as mostly sunny sky conditions have
returned to the region. However, there are still high clouds
streaming in from the northwest. As such, temperatures are likely
to warm into the low to upper 60s across the North Bay, East Bay,
and greater San Francisco Bay Area. Across the Central Coast,
temperatures are likely to warm into the low to mid 70s.

Tonight, look for tule fog to return to the interior East Bay
Valleys and Delta (similar timing as the previous nights) and
continue through midmorning on Monday. Fog may also impact the
North Bay Valleys in response to fog development in the Russian
River Valley and/or tule fog advecting in from the east.

Monday`s afternoon temperatures will be similar to those today
(Sunday) as the region continues to be under the influence of high
pressure. This ridge axis extends all the way up to just off of
the British Columbia coast. However, high clouds will persist over
the region through at least midweek.

&&

.LONG TERM...
Issued at 1251 PM PST Sun Jan 18 2026
(Monday night through next Saturday)

By mid to late week, troughing will develop out over the north
central Pacific. This feature is forecast to develop a cut-off
upper level low that will gradually approach the region late in
the week. However, there does not appear to be much of a moisture
source associated with it, so rainfall has been pushed back until
at least Monday, January 26th. With that said, the low pressure
system aloft will at least cool temperatures down to near seasonal
averages after a prolonged period of very warm afternoon
temperatures. Thus, we will have to wait a bit longer for much
needed rainfall to return.

&&

.AVIATION...
(00Z TAFS)
Issued at 508 PM PST Sun Jan 18 2026

VFR continues for most TAF sites through the TAF period. The
exceptions will be STS and APC which will see fog overnight as well
as fog and haze possible at LVK. Winds will mostly say light through
the TAF period with directions being mostly variable. Some sites
along the coast will see northwest Monday afternoon, while others
stay variable, and LVK goes easterly.

Vicinity of SFO...VFR through the TAF period. Expect mostly light
and variable winds through the night and much of the Monday before
winds turn northwesterly in the late afternoon, but become variable
again into the night.

SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...VFR through the TAF period. West winds
become more variable into the night. Southeast winds build at SNS in
the late night and last into Monday afternoon before turning
northwesterly in the mid afternoon. Winds at MTR look to stay light
and variable through the end of the TAF period.
&&

.MARINE...
(Tonight through next Saturday)
Issued at 508 PM PST Sun Jan 18 2026

Gentle to moderate northeast to east breezes persist across the
San Pablo Bay, the Delta, and through the Golden Gate through
Wednesday as light to gentle northeast to north winds continue
across the rest of the coastal waters. Later this week, the ridge
should break down as a weak cutoff low approaches, allowing winds
to increase and shift to the northwest. Low seas up to around 6
feet continue through the middle of the week as a northwest swell
builds.

&&

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

$$

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

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