990
FXUS66 KMTR 261157
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
457 AM PDT Thu Jun 26 2025

...New AVIATION, MARINE...

.SYNOPSIS...
Issued at 227 AM PDT Thu Jun 26 2025

Seasonal temperatures with night and morning stratus will continue
into next week. A weak upper-level trough could bring the chance
for some unsettled weather late weekend into early next week.

&&

.SHORT TERM...
(Today and tonight)
Issued at 227 AM PDT Thu Jun 26 2025

Another June Gloom day on tap with temperatures generally near
seasonal normals. The marine layer is currently being observed at
1,100 feet on the Fort Ord profiler with satellite showing stratus
along the Pacific Coast, through the Golden Gate Gap, and down the
Northern Salinas Valley. Expect stratus to retreat towards the coast
by late-morning with some mist/drizzle possible until then. Your
weather nugget of the day is that the 00Z 06/26/2025 weather balloon
recorded a precipitable water value of 0.42 inches, that is below
the 10th percentile (0.48 inches) for the day.

A Coastal Flood Advisory (the last one of this astronomical high
tide sequence) is in effect from 11PM Thursday through 2AM Friday
for Bayshore locations of the San Francisco Bay and San Pablo Bay
for minor coastal flooding during nocturnal high tide. Known impacts
occur in Bayside Marin County where coastal locations next to
Richardson Bay such as Sausalito, Tam Valley, Manzanita, the
Sausalito-Mill Valley Bike Path, and the Manzanita Park N Ride
experience localized flooding. As always, do not drive around
barricades or through water of unknown depth.

&&

.LONG TERM...
(Friday through Wednesday)
Issued at 227 AM PDT Thu Jun 26 2025

Typical June Gloom/No Sky July long term forecast on tap with one
caveat...

Global ensemble clusters are in agreement of an upper-level
shortwave trough making its way into our area late weekend into
early next week. All three deterministic models (Canadian, ECMWF,
and GFS) show a negatively-tilted 582 dam upper-level cutoff low off
our coast at 12Z (5AM) Monday. While that may sound exciting, as of
now there`s no mentionable precipitation or thunderstorm chances.
Precipitable water values are forecast to increase, but point model
soundings show 0 CAPE, so instability seems to be the missing
ingredient from the three ingredients method (lift, instability,
moisture). As is typical with cutoff lows, they are notoriously
difficult to forecast due to their lack of jet stream support. Add
in an active Eastern Pacific Basin and the forecast becomes even
more complex - which is what we are dealing with!

&&

.AVIATION...
(12Z TAFS)
Issued at 437 AM PDT Thu Jun 26 2025

A compressed marine layer is helping to limit widespread coverage
of low marine stratus, currently lingering in the vicinity of the
Bay Area terminals. Expect the stratus to begin clearing by late
morning with a return to IFR/MVFR ceilings later tonight into
Friday morning.

Vicinity of SFO...Bay Area terminals will continue to hover
between IFR/MVFR ceilings with VFR expected by late this morning
with occasional light drizzle. Gusty onshore winds will settle in
this afternoon before easing after sunset. IFR ceilings are
expected to fill back in later this evening.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Low stratus with patchy fog/drizzle will
persist through the late morning under a compressed marine layer.
Stratus and fog/drizzle is expected to begin to mix out by late
this morning into early afternoon. Breezy to gusty onshore winds
can be expected this afternoon and early evening, with a return of
the marine layer expected in the early evening when the winds
begin to ease.

&&

.MARINE...
(Today through Tuesday)
Issued at 437 AM PDT Thu Jun 26 2025

Fresh to strong northwesterly breezes with near-gale force gusts
will continue through Friday. Gale force gusts can be expected
near the coastal jet regions of Point Reyes and Point Sur this
afternoon and evening. Moderate to rough seas will also continue
through tomorrow, with northwesterly winds easing over the
weekend.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Coastal Flood Advisory from 11 PM this evening to 2 AM PDT
     Friday for CAZ006-506-508.

PZ...Small Craft Advisory from 9 AM this morning to 9 PM PDT this
     evening for Mry Bay.

     Small Craft Advisory until 9 AM PDT this morning for Pt Arena to
     Pt Reyes 0-10 nm.

     Gale Warning from 9 AM this morning to 9 PM PDT this evening for
     Pt Arena to Pt Reyes 0-10 nm.

     Small Craft Advisory until 3 PM PDT Friday for Pigeon Pt to Pt
     Pinos 10-60 NM-Pt Arena to Pt Reyes 10-60 NM-Pt Reyes to
     Pigeon Pt 0-10 nm.

     Small Craft Advisory from 9 AM this morning to 3 PM PDT Friday
     for Pigeon Pt to Pt Pinos 0-10 nm.

     Small Craft Advisory until 3 PM PDT this afternoon for Pt Pinos
     to Pt Piedras Blancas 0-10 nm.

     Gale Warning from 3 PM this afternoon to 3 AM PDT Friday for Pt
     Pinos to Pt Piedras Blancas 0-10 nm.

&&

$$

SHORT TERM...Sarment
LONG TERM....Sarment
AVIATION...JM
MARINE...JM

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