660
FXUS66 KMTR 041743
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1043 AM PDT Tue Jun 4 2024

...New AVIATION, MARINE...

.SYNOPSIS...
Issued at 230 AM PDT Tue Jun 4 2024

Warm to hot inland, coolest at the immediate coast today. A Heat
Advisory is in effect for inland areas today through Thursday.
Temperatures will moderate towards the latter part of the week.

&&

.SHORT TERM...
(Today and tonight)
Issued at 247 AM PDT Tue Jun 4 2024

Sky condition is clear (allowing improved radiative cooling vs cloud
cover 24 hours ago) except for few-scattered thin high clouds and
patchy morning mist or fog along the immediate coastline within a
marine layer varying from a few to several hundred feet deep North
Bay to 1600 feet deep over the north Central Coast.

The advertised Heat Advisory goes into effect today for the North
Bay and the East Bay (the advisory expanding to include areas of
the South Bay, interior Monterey county including the southern
Salinas Valley and San Benito county Wednesday-Thursday).

Here are some heat safety tips:

* Stay hydrated and drink plenty of fluids.
* Wear lightweight, light-colored clothing.
* Reduce time spent outdoors or stay in the shade.
* Never leave people or pets unattended in vehicles.
* Use sunscreen if going to the coast or the pool.

Highs today will be mainly above to well above early June normal
high temperatures. Highs will be coolest along the immediate
coastline/beaches with 70s to a few warmer spots not far from the
beaches in the lower 80s, bayside highs will be 80 to 90 with
lower 90s just away from the SF Bay. Farthest inland highs today
in the 90s to near 100 degrees far northern Napa county,
easternmost Contra Costa county and far southern Monterey county.
The Santa Rosa coop station may near the June 4th record high 98F
in 1949.

&&

.LONG TERM...
(Wednesday through Monday)
Issued at 247 AM PDT Tue Jun 4 2024

As mentioned, the heat advisory continues inland areas Wednesday
and Thursday. Warm to hot daytime highs, above to well above June
normal highs - hottest inland with 90s to lower 100s, nearer the
coast 80s and 90s, and 70s/80 at the beaches. Hot weather will
result in elevated fire weather conditions at least through
Thursday. Improving chances of patchy night and morning coastal
stratus and fog redeveloping later in the week. The NAM forecasts
the SFO-SAC pressure gradient (westerly winds) prevailing Thursday
afternoon and evening, however it still make take an extra day or
two for the afternoon sea breeze to bring some relief farther inland.

A high pressure system is forecast to remain nearly stationary over
the west late this week into next week, surrounded by low pressure
systems of various strength. Weak upper level troughing may reach
California over the weekend, the daily sea breeze likely during
then bringing relief at least partially inland each afternoon and
evening.

&&

.AVIATION...
(18Z TAFS)
Issued at 1042 AM PDT Tue Jun 4 2024

Currently VFR at all terminals with not a cloud in the sky. High
confidence in VFR through the TAF period at all terminals except the
Monterey Bay terminals of MRY and SNS. Winds will remain onshore
through the TAF period, becoming gusty this afternoon.

Vicinity of SFO...Currently VFR with offshore flow. High confidence
in VFR through the TAF period. Winds will transition to become
westerly and gusty this afternoon with gusts up to 30 knots to be
expected. Winds will diminish overnight and remain westerly through
the TAF period.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Currently VFR with northwesterly flow at
both terminals. Winds will prevail out of the west/northwest through
the TAF period. Confidence is not high on if the terminals will see
any reduction in flight category through the TAF period; however,
with the pattern being dominated by high pressure, the most
likely outcome would be LIFR conditions in the early-to-mid
morning hours with greater confidence of occurrence at MRY as
compared to SNS.

&&

.MARINE...
(Today through Sunday)
Issued at 1042 AM PDT Tue Jun 4 2024

Surface high pressure over the Eastern Pacific Ocean will build
and  move east, allowing for strong northwesterly breezes to
prevail  today and tomorrow with gale force gusts possible over
the outer  waters and the northern coastal zones this afternoon
and evening.  As this surface high pressure traverses to the north
Thursday,  the pressure gradient will be allowed to relax and
northwesterly  breezes will be allowed to diminish. By the
weekend, another  surface high pressure over the Eastern Pacific
Ocean builds and  moves to the northeast, tightening the pressure
gradient, allowing for strong northwesterly breezes to prevail
over the northernmost zones. Significant wave heights build to 12
to 14 feet by  Wednesday with an abating trend set for Thursday
through Saturday  before significant wave heights build again
towards the end of the period.

&&

.BEACHES...
Issued at 859 PM PDT Mon Jun 3 2024

A Beach Hazards Statement is in effect from Wednesday morning
through Thursday evening.

A moderate-rough NW swell will arrive Wednesday and create large
breaking waves and an increased risk for sneaker waves. Breaking
waves will reach as high as 15-20 ft, especially along steep
beaches. Sneaker waves can run over 100 ft up a dry beach, pulling
people in the water from rocks, jetties, and beaches. Inexperienced
swimmers should stay out of the water. Observe the ocean for 20
minutes before relaxing on the beach. The hot weather inland will
lead to more people visiting the beach this week. Know where
lifeguards are, obey their instructions, and never turn your back
on the ocean!

&&

.CLIMATE...
Issued at 127 AM PDT Sat Jun 1 2024

Record high temperatures at the long term climate stations for
June 4th and 5th:

Station             June 4th             June 5th

Santa Rosa          98 in 1949           102 in 1926
Kentfield          101 in 1981           102 in 1926
Napa               102 in 1981           105 in 1903
Richmond            90 in 1955            86 in 1983
Livermore          105 in 1960           104 in 1926
San Francisco       92 in 1949            95 in 1883
SFO Airport         92 in 1955, 1949      89 in 1972
Redwood City       100 in 1981            97 in 2002, 1972
Half Moon Bay       71 in 1955            74 in 1958
Oakland downtown    96 in 1981            87 in 2002
San Jose            98 in 1904           100 in 1926
Salinas Airport     92 in 1949            87 in 1949
King City          102 in 1981, 1957     105 in 1926

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement from Wednesday morning through Thursday
     evening for CAZ006-505-509-530.

     Heat Advisory until midnight PDT Thursday night for CAZ503-504-
     506-510-515.

     Heat Advisory from 8 AM Wednesday to midnight PDT Thursday night
     for CAZ513-514-516-518.

PZ...Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this
     evening for Mry Bay-SF Bay N of Bay Bridge.

     Small Craft Advisory until 3 PM PDT this afternoon for Pigeon Pt
     to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm.

     Gale Warning from 3 PM this afternoon to 9 PM PDT this evening
     for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-
     10 nm.

     Small Craft Advisory until 3 AM PDT Thursday for Pt Arena to Pt
     Reyes 10-60 NM-Pt Reyes to Pigeon Pt 0-10 nm.

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

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

     Small Craft Advisory until 9 AM PDT Wednesday for Pt Pinos to Pt
     Piedras Blancas 0-10 nm.

&&

$$

SHORT TERM...Canepa
LONG TERM....Canepa
AVIATION...Sarment
MARINE...Sarment

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