-- Discussion containing changed information from previous version are highlighted. --
120
FXUS66 KMTR 041134
AFDMTR

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

...New AVIATION...

.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...
-- Changed Discussion --
(12Z TAFS)
Issued at 431 AM PDT Tue Jun 4 2024

VFR except for a patch or two of stratus and fog /LIFR-IFR/ along
the immediate coastline this morning. The NAM forecasts the ACV-SFO
pressure gradient to strengthen to nearly 9 mb by later today, the
UKI-STS pressure gradient strong at 2 mb to 3 mb. Local influxes of
cooler marine air will continue nearest the immediate coastline,
for example statistical guidance is forecasting a gusty west wind
to around 30 knots at KSFO this afternoon and evening. Additionally,
the leading edge of stratus and fog approx 300 miles northwest of
the Bay Area where surface dewpoint temps are higher is forecast
to reach our coastline late tonight and Wednesday morning per
recent HREF output; coastal waters sea surface temperatures remain
chilly which favors coastal stratus and fog.

Vicinity of SFO...VFR. Light west wind this morning, increasing to
22 to 32 knots beginning 21z and continuing to mid-late evening.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR. Light and variable winds this morning,
becoming west to northwest winds 5 to 12 knots during the day.
Patchy stratus and/or fog /LIFR-IFR/ early Wednesday morning.
-- End Changed Discussion --

&&

.MARINE...
(Today through Sunday)
Issued at 252 AM PDT Tue Jun 4 2024

Breezy to gusty north and northwest winds affect all of the
waters through the mid week. Meanwhile, large NW swell will arrive
in the coastal waters of Northern and Central California. These
rough seas will last through Thursday. Conditions will then
gradually improve going into the weekend.

&&

.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 from 8 AM this morning to 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 AM PDT Thursday for Pigeon Pt to Pt
     Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt
     Reyes 10-60 NM.

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

     Small Craft Advisory from 9 AM this morning to 3 AM 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...Canepa
MARINE...Murdock

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