471
FXUS66 KMTR 240957
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
257 AM PDT Tue Jun 24 2025

...New SYNOPSIS, SHORT TERM, LONG TERM, MARINE...

.SYNOPSIS...
Issued at 257 AM PDT Tue Jun 24 2025

The forecast will be set to repeat with coastal clouds, fog, cool
overnights, and warm days on tap. The coastal clouds and fog will
advance inland each night and will mix out there during the morning,
leading to sunny interior skies for the afternoon.

&&

.SHORT TERM...
(Today and tonight)
Issued at 257 AM PDT Tue Jun 24 2025

Satellite imagery has been mesmerizing tonight as we watch the
stratus slink through the interior valleys of the Bay Area and
Central Coast. Its tendrils have seeped deeply into the North Bay,
penetrated most of the Central Coast, and is infiltrating the the
East and South Bay region. The question for the rest of the morning
is how much further inland will the stratus make it? Confidence is
on the lower end for a full intrusion into Napa County and the
interior East Bay, but there is some signal for that occuring given
we have started to see pockets of stratus form once the high clouds
have moved out of the region. This might occur between 3AM-5AM and
then hold for a few hours before mixing out by mid to late morning.
A typical summer day is then expected, with sunny skies inland,
stratus hugging oceanside coastal communities. The stratus will make
another return tonight and should have similar foot print.

&&

.LONG TERM...
(Wednesday through Monday)
Issued at 257 AM PDT Tue Jun 24 2025

Quasi zonal flow is expected midweek, with weak upper level
troughing returning for the weekend. High temperatures will have a
slight warming trend through this period, especially for interior
locations where we go from the upper 80s to low 90s to low to mid
90s by the weekend. Coastal communities will remain cooler,
especially if confined to areas of stratus where highs will vary
from the upper 50s to mid 70s.


&&

.AVIATION...
(06Z TAFS)
Issued at 943 PM PDT Mon Jun 23 2025

The evening onshore 3.9 mb SFO-SAC pressure gradient predominates
while the marine layer depth along the immediate coastline varies
from 1200 to 1500 feet. Earlier in the evening the Oakland upper
air sounding showed a marine layer depth ~ 400 feet. Stratus and
fog will move inland tonight and Tuesday morning then mix out back
to near the immediate coast Tuesday afternoon, though e.g. HREF
output for Tuesday is showing a high probability IFR ceiling all
day at KHAF. Patchy light coastal drizzle has already developed
with additional patchy light drizzle developing tonight and
Tuesday morning. Stratus, fog and possibly patchy light drizzle
return Tuesday night and early Wednesday.

Vicinity of SFO...VFR, then MVFR 09z-17z tonight and Tuesday. West
to northwest wind decreasing to near 10 knots tonight and Tuesday
morning. MVFR due to stratus redevelops by mid Tuesday evening.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Stratus and fog /LIFR-IFR/ tonight and
Tuesday morning, with clearing back to near the coastline Tuesday
afternoon. Onshore winds 5 to 15 knots.

&&

.MARINE...
(Today through Sunday)
Issued at 257 AM PDT Tue Jun 24 2025

Fresh northwesterly breezes and moderate seas will prevail  today.
Fresh to strong northwesterly breezes and moderate to rough seas
will prevail Wednesday through Saturday.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Coastal Flood Advisory from 8 PM this evening to 1 AM PDT
     Wednesday for CAZ006-506-508.

PZ...Small Craft Advisory until 3 AM PDT early this morning for Pt
     Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM.

     Small Craft Advisory from 9 AM to 9 PM PDT Wednesday for Pt
     Arena to Pt Reyes 0-10 nm.

     Small Craft Advisory from 3 PM this afternoon to 9 PM PDT
     Wednesday for Pt Arena to Pt Reyes 10-60 NM.

     Small Craft Advisory from 3 PM to 9 PM PDT Wednesday for Pigeon
     Pt to Pt Pinos 10-60 NM.

&&

$$

SHORT TERM...KR
LONG TERM....KR
AVIATION...Canepa
MARINE...Sarment

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