Lafayette, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

301
FXUS66 KMTR 241753
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1053 AM PDT Tue Jun 24 2025

...New AVIATION, 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.

&&

.UPDATE...
Issued at 919 AM PDT Tue Jun 24 2025

The marine layer spread well inland this morning with a depth up
to around 2000 feet. Low clouds are slowly retreating but still
cover much of the North Bay valleys as of 9 am. Enough drizzle
to tip the bucket at 0.01 in the City this morning at our official
climate site. Low clouds will slowly peel back towards the coast
through midday. The northerly and southerly gradients down the
coast are nearly flat but the SFO-Sac is 2.5 mb with sustained 23
kt winds being reported at Travis AFB keeping a nice Delta breeze
going. Synoptic pattern shows an upper trough over Nevada with
weak shortwave ridge trying to build over Northern California
later tonight into Weds. Net result should be little overall
change in the marine layer depth and corresponding temperature
pattern that will feature 60s coast, 70s bayside and mainly 80s
inland. Day over day changes remain minimal through at least
Thursday with a modest inland warming trend as we head into the
weekend as temps warm back into the mid 90s inland but nothing
excessively hot for the last week of June.

&&

.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...
(18Z TAFS)
Issued at 1050 AM PDT Tue Jun 24 2025

Mix bag of LIFR to MVFR conditions across the region this morning,
yet signs of clearing are occuring over most terminals within the
next few hours. However, coastal locations such as HAF and MRY may
linger in the IFR/MVFR range through much of the day. Onshore winds
will increase this afternoon with locally stronger gusts, then will
ease overnight and into early Wednesday morning. High confidence for
LIFR to MVFR ceilings to make an early return late this evening
across the Monterey Bay terminals and early Wednesday morning across
the Bay Area terminals.

Vicinity of SFO...Clearing sky conditions are expected this
afternoon with increasing onshore winds with gusts to around 25 kt
at SFO. High confidence for an early return of IFR/MVFR ceilings
Wednesday morning with easing winds. Onshore winds will increase and
low clouds will clear by late morning or early afternoon on
Wednesday.

SFO Bridge Approach...The San Mateo Bridge Approach is clearing at
this hour; however, low stratus may linger between OAK, SFO, and
northward through the Golden Gate Bridge through the TAF period.
Low stratus clouds will filter in by 06Z Wednesday morning.

Monterey Bay Terminals...Onshore winds increase once again this
afternoon. IFR/MVFR conditions may linger through much of the TAF
period at MRY while SNS is forecast to have at least a few hours of
VFR conditions this afternoon. High confidence for an early return
of LIFR/IFR conditions late this evening at MRY and IFR/MVFR at SNS
with easing winds.

&&

.MARINE...
(Today through Sunday)
Issued at 1050 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 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.

&&

$$

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

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