Castro Valley, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

734
FXUS66 KMTR 042053
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
153 PM PDT Wed Jun 4 2025

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

.SYNOPSIS...
Issued at 1231 PM PDT Wed Jun 4 2025

Fair weather continues over the next several days with cloudy
mornings and clear afternoons. Temperatures around seasonal
normals with a slight warming trend into next work week.

&&

.SHORT TERM...
(This evening through Thursday)
Issued at 1231 PM PDT Wed Jun 4 2025

Very typical seasonable set up going on right now across the
region. One notable aspect going on today is a weak surface low
in response to a subtle upper-level shortwave trough. That has
resulted in temps a few degrees cooler than yesterday, and will
likely reinforce some marine stratus and onshore flow for areas
south of the SF Bay Thursday morning. Otherwise, Thursday looks
like another beautiful day to get outside. Temps closely mirroring
that of today with the marine layer deepening slightly, cooling
off the coast by a couple of degrees.

&&

.LONG TERM...
(Thursday night through next Tuesday)
Issued at 1231 PM PDT Wed Jun 4 2025

Subtle warming trend on tap into the weekend with an interesting
twist. Guidance depicts a subtle cutoff low that meanders off the
CA coast into the weekend. Amid a strong ridge that will heat up
most of the west, this cutoff low will likely again reinforce
onshore flow and keep the marine layer intact. Thus, our temps
appear to be moderated by this feature and may actually result in
very little noticeable change in the weather through the weekend
for most folks. Some hints at larger scale troughing after the end
of the extended period, which would result in a more noticeable
pattern change. Details on that will be more clear in the coming
days.

&&

.AVIATION...
(18Z TAFS)
Issued at 1203 PM PDT Wed Jun 4 2025

Cloud cover is clearing for all the TAF sites with he exception of
HAF which will have CIGs and visibility reductions through the TAF
period. Expect moderate to breezy winds through the afternoon and
into the evening before winds begin to reduce. Cloud cover builds
along the coast and the Monterey Bay in the evening, with LIFR CIGs
affecting HAF and IFR CIGs at the Monterey Bay terminals. A surface
low nears the Golden Gate in the late night and early morning,
leading to increase southerly winds along the immediate coast. It
will also initially push cloud cover into the SF Bay, offering
inconsistent MVFR CIGs around the SF Bay and moments of light
southerly winds. As the low moves slightly south, it will push more
cloud cover to the North Bay terminals and pull cloud cover away
from SFO and OAK into early Thursday. Expect cloud cover to erode for
all but the immediate coast (which includes HAF) into late Thursday
morning, as winds build again.

Vicinity of SFO...Expect VFR to last into early Thursday. Moderate
to breezy northwest winds build in the mid afternoon last into the
late evening before reducing. Cloud cover filters into the SF Bay in
the late evening as a low pressure transports low clouds from it`s
southern edge into the bay in the late night. However the low
continues south into early Thursday, which will cause the cloud
cover to move more toward the North Bay. This means any filling of
CIGs looks brief, and the more west winds look to have moments of
southerly wind. Expect consistent VFR to return further into
Thursday morning with moderate southwest building that afternoon.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR and moderate winds last into the
evening. Expect winds to reduce in the mid evening as cloud cover
begins to rebuild around the Monterey Bay with IFR CIGs filling over
the terminals. CIGs erode at SNS into in the mid morning on Thursday
while lifting to MVFR levels at MRY. CIGS push back into the marine
environment into the late morning, calling for VFR as moderate winds
build.

&&

.MARINE...
(Tonight through next Monday)
Issued at 1203 PM PDT Wed Jun 4 2025

Widespread breezy conditions are affecting the waters with some
zones seeing gusty winds causing hazardous conditions for small
craft. The northern outer waters continue to see gale conditions.
Expect winds to slowly reduce into the late week. A southerly
coastal jet will bring strong onshore winds tonight in the San
Francisco Bay and in the exposed waters across the Golden Gate.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 3 AM PDT Friday for SF Bay N of Bay
     Bridge.

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

     Gale Warning until 3 AM PDT Thursday for Pt Arena to Pt Reyes 10-
     60 NM.

&&

$$

SHORT TERM...Behringer
LONG TERM....Behringer
AVIATION...Murdock
MARINE...Murdock

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