492
FXUS66 KMTR 251737
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1037 AM PDT Wed Jun 25 2025

...New AVIATION, MARINE...

.SYNOPSIS...
Issued at 316 AM PDT Wed Jun 25 2025

Typical summertime weather continues with the marine layer remaining
nestled in place. Look for cloudy and cool nights, breezy onshore
winds during the afternoon and evening, and the stratus eroding for
interior locations each day.

&&

.UPDATE...
Issued at 918 AM PDT Wed Jun 25 2025

2000 foot marine layer in place with inland clouds starting to
slowly mix out. Expect a slow clearing back towards the coast
through the day with beaches/Hwy1 corridor remaining cloudy.
SFO-Sac gradient around 2 mb this morning with lighter 15 mph
winds (compared to yesterday) pushing out into the Delta. 850 mb
temps around 18-19 celsius today along with continued onshore
winds and a modestly deep marine layer will keep temperatures on
the cool side of normal for this time of year. No updates of note
planned at this time with current forecast on track and incoming
12z guidance showing no big changes.

&&

.SHORT TERM...
(Today and tonight)
Issued at 316 AM PDT Wed Jun 25 2025

Y`all, another night of writing about the stratus. It`s here and
it`s established leading to a comfortably cool night and pockets of
fog. The marine layer looks to be between 1500-2000ft tonight which
supports the picture from space showing stratus blanketing a good
portion of the Bay Area and Central Coast. It has even snuck it`s way
into Solano and Yolo counties! With that being said, interior clouds
should erode by mid to late morning leading to another sunny day.
Near the coast, clouds should linger which will keep temperatures
cooler. Highs for interior locations will range from the low 80s to
mid 90s while coastal areas or areas stuck with stratus have
temperatures range from the upper 50s to mid 70s. Stratus should
make a return tonight though guidance shows the marine layer might
not be as deep.

&&

.LONG TERM...
(Thursday through Tuesday)
Issued at 316 AM PDT Wed Jun 25 2025

Zonal flow sets up for Thursday with upper level troughing returning
Friday and into the weekend. This trough will be parked over
southern CA while zonal flow to weak ridging sets up to our north.
Temperatures will warm some, but be near seasonal to seasonably warm
depending on the location. High temps will range from roughly 60
degrees in San Francisco to the 90s for the interior valleys.

&&

.AVIATION...
(18Z TAFS)
Issued at 1036 AM PDT Wed Jun 25 2025

Currently a mix of IFR to MVFR conditions across much of the region,
while inland areas have either scattered or completely cleared out.
Conditions will continue to improve through late morning with most
sites forecast to return to VFR between 18-20Z with increasing
onshore winds. However, HAF may maintain IFR to MVFR conditions
throughout the TAF period. Low to moderate confidence for IFR to
MVFR conditions to return to the Bay Area terminals early Thursday
morning. The HRRR does not show any low ceilings impacting the
region during the overnight hours and into Thursday morning, yet
other guidance suggests they return around or after 07Z Thursday.
Meanwhile, greater confidence for the Monterey Bay terminals
returning to LIFR to MVFR around 03Z Thursday. Winds increase once
again Thursday afternoon with just about all sites returning to VFR
conditions.

Vicinity of SFO...VFR. Winds increase this afternoon with gusts up
to or greater than 25 KT. Winds ease a bit overnight and into
Thursday morning with low to moderate confidence for IFR to MVFR
conditions returning. Any low clouds that do happen to develop will
clear out by around 17Z Thursday with onshore winds once again
expected to increase.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Tricky forecast this morning with IFR
conditions prevailing at MRY while SNS is likely to clear out by 18Z
today. To believe MRY will scatter out around 19Z with an early
return around 03Z Thursday at both sites. Onshore winds increase
this afternoon before easing overnight and into early Thursday
morning. Moderate to high confidence.

&&

.MARINE...
(Today through Monday)
Issued at 1036 AM PDT Wed Jun 25 2025

Fresh to strong northwesterly breezes with near-gale force gusts
will prevail through the week. Gale force gusts can be expected
near the coastal jet regions of Point Reyes and Point Sur on
Wednesday and Thursday afternoons. Moderate to rough seas will
prevail through the week.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Coastal Flood Advisory from 9 PM this evening to 2 AM PDT
     Thursday for CAZ006-506-508.

PZ...Small Craft Advisory from 9 AM to 9 PM PDT Thursday for Mry Bay.

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

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

     Small Craft Advisory from 3 PM this afternoon to 3 AM PDT Friday
     for Pigeon Pt to Pt Pinos 10-60 NM-Pt Reyes to Pigeon Pt 0-
     10 nm.

     Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this
     evening for Pigeon Pt to Pt Pinos 0-10 nm.

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

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

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

     Small Craft Advisory until 3 AM PDT Friday for Pt Arena to Pt
     Reyes 10-60 NM.

&&

$$

UPDATE.......RW
SHORT TERM...KR
LONG TERM....KR
AVIATION...RGass
MARINE...RGass

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