Altadena, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

494
FXUS66 KMTR 141109
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
409 AM PDT Wed May 14 2025

...New AVIATION, MARINE...

.SYNOPSIS...
Issued at 204 AM PDT Wed May 14 2025

Departing trough and upstream ridging promote fair weather and a
warming trend through the rest of the week. Slight cool off into
the weekend as another upper level trough moves through. Better
signal for gusty conditions and potential offshore winds early
next week.

&&

.SHORT TERM...
(Today and tonight)
Issued at 204 AM PDT Wed May 14 2025

Northwest flow and drier air aloft will restore fair weather
conditions across the region today, paving the way for a warming
trend through this week. High temperatures around seasonal normals
today with mostly clear skies. Some cloud cover will likely
encroach upon the North Bay later this afternoon as some leftover
moisture from decaying convection advects into the northern
portion of the state. CAMs also advertising some fair weather CU
across the Gabilan Range again, but limited-to-no instability and
decreasing moisture will greatly limit any further vertical
development.

&&

.LONG TERM...
(Thursday through Tuesday)
Issued at 204 AM PDT Wed May 14 2025

Despite a quiet mid-week period, a rather active pattern persists
into this weekend and early next week. A deep upper low is progged
to move out of the Gulf of Alaska region into the Western US by
the weekend, closely resembling a pattern that would result in
offshore winds across the North Bay and Central Coast. However,
current guidance depicts this feature taking a bit more of a
western trajectory compared to a typically "inside slider", so we
don`t see the signal for widespread impactful offshore winds as of
this issuance. However, ensemble guidance does advertise high
confidence in this pattern resulting in gusty surface conditions
across the region, especially Saturday and Sunday. Stay tuned for
forecast updates and any necessary information regarding the
potential for elevated fire danger this weekend.

&&

.AVIATION...
(12Z TAFS)
Issued at 409 AM PDT Wed May 14 2025

MVFR CIGs continue to build along the coast and around the bays with
winds staying mostly light.  Pockets of fog look to form in some of
the valleys, affecting STS in the early to mid morning. CIGs erode
in the mid to late morning, leading to widespread VFR for the
afternoon as winds become moderate to breezy. Expect winds to reduce
into the evening and early night. MVFR and IFR CIGs build along the
coast into Wednesday night, affecting HAF and the Monterey Bay
terminals.


Vicinity of SFO...Expect moments MVFR CIGs into the mid morning.
Winds look to stay light through the morning and into the afternoon
as skies clear. Moderate west winds build in the mid afternoon but
become light again into Tuesday night.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...MVFR and IFR CIGS are building around the
Monterey Bay. Expect mostly light winds through the late morning.
CIGs scatter into the mid to late morning as moderate to breezy
winds build. Winds reduce into Wednesday evening as MVFR and IFR
CIGs return.

&&

.MARINE...
(Today through Monday)
Issued at 409 AM PDT Wed May 14 2025

Winds are building across the waters with Gales in the northern
waters that will spread to the southern outer waters into
Wednesday afternoon. These strong winds will result in steep fresh
swell with hazardous conditions. Winds and seas look to remain
elevated through the forecast period.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this
     evening for Mry Bay.

     Gale Warning until 3 AM PDT Thursday for Pt Arena to Pt Reyes 0-
     10 nm.

     Small Craft Advisory until 3 AM PDT Friday for Pt Reyes to
     Pigeon Pt 0-10 nm.

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

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

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

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

     Small Craft Advisory until 3 PM PDT this afternoon for Pigeon Pt
     to Pt Pinos 10-60 NM.

     Gale Warning from 3 PM this afternoon to 3 AM PDT Friday for
     Pigeon Pt to Pt Pinos 10-60 NM.

&&

$$

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

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