-- Discussion containing changed information from previous version are highlighted. --
186
FXUS66 KMTR 120732
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1232 AM PDT Sun May 12 2024

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

.SYNOPSIS...
-- Changed Discussion --
Issued at 1228 AM PDT Sun May 12 2024

A relatively quiet pattern will develop featuring overnight and
morning coastal clouds with clear skies elsewhere. Inland
temperatures will warm into the 70s and 80s each afternoon with
cool onshore breezes keeping coastal temperatures in the 60s.
-- End Changed Discussion --

&&

.SHORT TERM...
-- Changed Discussion --
(Today and tonight)
Issued at 1228 AM PDT Sun May 12 2024

The marine layer has deepened appreciably with an inversion height
around 800 to 1200 feet per area profilers. Low stratus is
widespread early this morning with greater inland penetration as
compared to yesterday. For those hoping to view the Aurora your best
bet is to either head inland or into the higher terrain above the
marine inversion. Given the deeper marine layer we`re seeing much
less in the way of fog as compared to yesterday as cloud bases are
generally just a tad above the surface. The large-scale picture
features weak troughing aloft over the West Coast with downstream
ridging over the Desert Southwest region. This pattern will support
the continued deepening of the marine layer with a repeat
performance of low stratus tonight. For today, expect clouds to
gradually clear towards the coast with inland warming. High
temperatures will range from the 60s along the coast, to the 70s for
the marine influenced valleys, to the 80s for the warmest inland
locations. A few hot spots across southern Monterey County may even
eclipse the 90 degree mark. Temperatures tonight will be mostly in
the upper 40s to lower 50s, with readings a bit warmer in the higher
terrain inland.
-- End Changed Discussion --

&&

.LONG TERM...
-- Changed Discussion --
(Monday through Saturday)
Issued at 1228 AM PDT Sun May 12 2024

Temperatures will cool slightly with onshore flow and weak troughing
aloft persisting. An upper ridge does build/strengthen over the
northeast Pacific by mid week, but it appears our area will remain
along its periphery with no strong signal for a warming trend. In
general high temperatures will range from the 60s along the coast to
the lower-mid 80s for the warmest inland areas. This will only
produce a minor HeatRisk for the warmest locations. Lows will
generally be in the lower to mid 50s. Coastal clouds are likely
during the overnight and AM hours with a gradual clearing towards
the coast each afternoon.
-- End Changed Discussion --

&&

.AVIATION...
(06Z TAFS)
Issued at 1035 PM PDT Sat May 11 2024

Currently seeing a mix of VFR-IFR at the terminals as a deeper
marine layer of about 1,000 feet is being allowed to protrude
further inland. With the exception of LVK, all terminals will
experience a reduction in flight category within the TAF period.
Widespread VFR and breezy onshore flow will prevail by tomorrow
afternoon.

Vicinity of SFO...Currently VFR with breezy northwesterly flow.
Low-end MVFR conditions will return to the terminal overnight with
clearing expected by 18Z. Winds will remain breezy out of the
west/northwest through the TAF period. MVFR conditions look to make
a return again tomorrow night.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Currently LIFR with northwesterly flow at
both terminals. Both terminals will improve to VFR by the afternoon.
Winds will remain breezy out of the west/northwest through the TAF
period. LIFR/IFR conditions are slated to return to MRY and SNS
respectively again tomorrow night.

&&

.MARINE...
(Tonight through next Friday)
Issued at 1035 PM PDT Sat May 11 2024

Widespread stratus continues across the coastal waters into
tomorrow morning. Fair weather and moderate northwesterly winds
with the occasional fresh gust continue through the end of the
weekend. Gustier conditions will develop across the northern
outer waters and along the Big Sur Coast beginning Sunday
afternoon. Northwest winds increase to a fresh breeze across all
of the coastal waters starting Monday as surface high pressure
over the Eastern Pacific Ocean builds and moves east. As winds
strengthen, significant wave heights will build through the early
work week reaching heights of 12-15 feet by mid-week before
beginning to diminish Thursday.

&&

.BEACHES...
Issued at 719 PM PDT Fri May 10 2024

Long period southwest swell will lead to slightly elevated chances
for sneaker wave and rip current development this weekend.
Conditions are expected to stay below Beach Hazards Statement
criteria as swell height will only be between 1-2 feet. However, in
light of anomalously warm temperatures and increased likelihood of
people traveling to the coast, visitors to the beach should remember
to take safety precautions to prevent being caught by an unexpected
large wave and to never turn your back on the ocean.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
CA...None.
PZ...Small Craft Advisory from 3 PM this afternoon to 3 AM PDT Monday
     for Pt Pinos to Pt Piedras Blancas 0-10 nm.

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

&&

$$

SHORT TERM...SPM
LONG TERM....SPM
AVIATION...Sarment
MARINE...Kennedy

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