-- Discussion containing changed information from previous version are highlighted. --
994
FXUS66 KMTR 231731
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1031 AM PDT Thu May 23 2024

...New AVIATION, MARINE...

.SYNOPSIS...
Issued at 1225 PM PDT Wed May 22 2024

Summer-like pattern to persist through Thursday. Temperatures are
forecast to dip below seasonal averages this weekend as an upper
level trough impacts the region. Temperatures begin to warm Sunday
through the next week.

&&

.UPDATE...
Issued at 809 AM PDT Thu May 23 2024

Satellite shows mostly clear skies over our region with some
patchy clouds near Monterey Bay and Salinas. A weak eddy has
formed over Monterey Bay that will be circulating some of the
clouds throughout the morning, but that area will remain somewhat
clear skies. Since today is not a typical "May Grey" morning,
definitely take a moment to enjoy some of that sunshine,
especially if you`re near the coast! No changes were made to the
forecast.

&&

.SHORT TERM...
(Today and tonight)
Issued at 250 AM PDT Thu May 23 2024

Patchy stratus is currently located along the Santa Cruz coastline
and extending into portions of Monterey, San Benito, and Santa Clara
counties. Stratus coverage may extend a bit farther into Monterey
Bay and up the San Mateo coastline but is not expected to expand too
far inland. The Fort Ord Profiler shows the top of the marine layer
around 1600-1800 feet which is fairly comparable to the depth of the
marine layer yesterday. Given persistence, this helps increase
confidence that any stratus that develops will stay along the
coastline and portions of the Monterey Bay. Overcast conditions are
expected to clear out by late morning/early afternoon with some
potential for scattered clouds to persist throughout the remainder
of the day. Widespread stratus coverage will return fairly early in
the evening throughout much of the Bay Area and Central Coast as
onshore flow increases and a weak surface low pressure system
approaches the coast.

As broad upper level troughing continues and offshore
flow weakens, temperatures will continue to cool Thursday with high
temperatures on average 1 to 3 degrees cooler than those observed on
Wednesday. Across the interior, temperatures will be seasonal with
highs generally in the 70s to low 80s but, along the coast, below
average temperatures in the mid 50s to low 60s persist. Minor heat
risk continues for portions of the Bay Area and Salinas Valley.
Individuals who are extremely sensitive to heat should remember to
stay hydrated while outdoors and to take breaks as needed. Slightly
drier RH values persist inland during the day on Thursday before
higher RH values and increased moisture return inland with this next
weak system.

&&

.LONG TERM...
(Friday through Wednesday)
Issued at 250 AM PDT Thu May 23 2024

A weak low pressure system will move inland Friday into Saturday and
bring widespread below average temperatures, increased stratus
coverage, and some potential for light drizzle in coastal areas.
Most inland locations will see temperatures 5 to 10 degrees below
average but some may see more significant drops with high
temperatures 10 to 15 degrees below average. High temperatures
throughout the interior will be in the 60s with a few areas of
elevated terrain potentially reaching the low 70s. Meanwhile on the
coast, temperatures will struggle to make it out of the upper 50s
and into the lower 60s Friday and Saturday. Ensemble and hi-res
guidance continue to suggest light drizzle, particularly in the
Monterey Bay region, is likely along the coast with non-impactful
accumulations typically less than 0.1". By Monday, shortwave ridging
will build over the West Coast with inland temperatures warming into
the upper 70s to low 80s and coastal temperatures into the upper 50s
to mid 60s.

If you are not a fan of the cooler weather we have been having, you
are in luck! Updated CPC graphics show above average temperatures
will become increasingly likely by early June. During this same time
frame, long term guidance is showing upper level ridging building
and, for the most part, lingering over the West Coast. Given that
this scenario is still a ways out, we will have to wait and see how
guidance continues to trend and how the forecast evolves.

&&

.AVIATION...
-- Changed Discussion --
(18Z TAFS)
Issued at 1024 AM PDT Thu May 23 2024

Currently VFR at all terminals with sparse stratus coverage in the
Monterey Bay and along the Big Sur Coast. Moderate confidence of VFR
through the TAF period at all terminals with the exception of the
Monterey Bay terminals of MRY and SNS. Low clouds in the range of
FL015-FL035 could impact the terminals of LVK, OAK, SFO, and SJC
overnight; however, confidence was not high enough at this time
to include as a definitive ceiling.

Vicinity of SFO...Currently VFR with breezy northwesterly flow. VFR
through the TAF period. Winds will transition to become westerly
with gusts up to 30 knots to be expected this afternoon and evening.
Low confidence in the development of an MVFR ceiling, but low clouds
in the range of FL030-FL050 will be present by the early morning
hours and linger through the end of the TAF period.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Currently VFR with northwesterly flow at
both terminals. Moderate confidence that MVFR stratus will return to
both terminals overnight. Winds will remain breezy out of the west
through the TAF period.
-- End Changed Discussion --

&&

.MARINE...
-- Changed Discussion --
(Today through Tuesday)
Issued at 1024 AM PDT Thu May 23 2024

Building surface high pressure over the Eastern Pacific Ocean will
allow for strong northwesterly winds to prevail for one more day
today, with gale force gusts across the outer coastal waters.
Expect  hazardous conditions and steeper wind waves as a result.
Northwesterly winds diminish and significant wave heights abate
heading into the weekend as surface high pressure over the Eastern
Pacific Ocean weakens and retrogrades to the west and a troughing
pattern evolves.
-- End Changed Discussion --

&&

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

     Small Craft Advisory until 3 PM PDT this afternoon for Pt Arena
     to Pt Reyes 0-10 nm.

     Gale Warning from 3 PM this afternoon to 9 PM PDT this evening
     for Pt Arena to Pt Reyes 0-10 nm.

     Small Craft Advisory until 3 PM PDT Friday for Pt Pinos to Pt
     Piedras Blancas 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.

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

     Small Craft Advisory from 9 AM to 3 PM PDT Friday for Pigeon Pt
     to Pt Pinos 0-10 nm.

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

     Gale Warning until 9 PM PDT this evening for Pigeon Pt to Pt
     Pinos 10-60 NM.
-- End Changed Discussion --

&&

$$

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

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