Technical NOAA Weather Discussion

FXUS66 KMTR 271855
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
1155 AM PDT Sat Jun 27 2026

...New AVIATION, MARINE...

.KEY MESSAGES...
Updated at 1225 AM PDT Sat Jun 27 2026

 - Gusty onshore winds today with east-west mountain passes as 
   high as 50+ mph. Winds increase for the waters this weekend, 
   with marine impacts through early next week 

 - An upper trough brings cooler temperatures, moisture, and a
   deeper marine layer with AM drizzle today

 - Beach hazards return this morning through Wednesday morning 
   for south and southwest facing beaches along the Pacific Coast

&&

.SHORT TERM...
Issued at 1225 AM PDT Sat Jun 27 2026
(Tonight through Sunday)

With troughing firmly in place, below normal temperatures are 
expected today with coastal drizzle and pockets of light rain 
through the morning. As the heights tighten with the southward push 
of the trough, winds will be elevated again today with gusts 50+ mph 
through west-east passes and mountain peaks, 20-40 mph wind gusts 
elsewhere. Winds will increase not only across inland areas, but 
also over the waters. Gusts up to 30-40 kt will be possible with 
seas of 8 to 10 ft. Marine hazards are currently in effect through 
Sunday morning, please see the marine discussion for further 
information.

Along the Pacific coastal beaches, there is a possibility for 
marginal coastal flooding. Due to the upcoming full moon (Monday), 
thermal expansion of Pacific waters, and southerly swells, 
coastal flooding for low lying beaches at predominantly south 
facing beaches is possible at high tides through Monday. An uptick
in long period southerly swell will result in a high risk of rip 
currents and sneaker waves. Never turn your back to the ocean! 
Beach hazards will be in effect this weekend and into much of next
week, see the beaches discussion for more information. 

&&

.LONG TERM...
Issued at 1225 AM PDT Sat Jun 27 2026
(Sunday night through next Friday)

The pattern begins to shift Sunday as the aforementioned low weakens 
and starts to move up into Idaho and Montana and heights slowly 
increase. With this, the marine layer will begin to compress a bit 
each day into early next week, and temperatures will slowly warm 
back towards normal. General troughing is expected to continue into 
next week with temperatures slowly warming into the middle of the 
week, but generally should remain at or below normal through the 
forecast period. Windy conditions will persists especially over the 
marine environment leading to a series of marine hazards, please see 
the marine discussion for further information.

The concern for hazardous beach conditions return for Pacific Coast 
beaches this weekend as long period southerly swells return. More 
information below in Beaches, but remember to never turn your back 
to the ocean!

&&

.AVIATION...
(18Z TAFS)
Issued at 1155 AM PDT Sat Jun 27 2026

Lower clouds are scattering and eroding, while mid and high clouds 
continue to move through the area. Winds increase across the region 
into the afternoon becoming breezy to gusty with the strongest winds 
expected along the coast and around the SF Bay, affecting HAF, OAK, 
and SFO. Winds will ease into the night for most areas, the 
exceptions being SFO and HAF that remain windy and breezy into the 
late night. Cloud cover returns to the Monterey Bay into the late 
night with MVFR CIGs and light to moderate winds. This cloud cover 
erodes into the mid morning on Sunday, leading to widespread VFR.

Vicinity of SFO...Cloud cover continues to lift and scatter with 
clearer conditions expected into the afternoon as west winds build. 
Strong gusts build develop into the mid afternoon, peaking around 35 
kts. These winds last into the night before reducing. 

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Cloud cover is clearing leading to VFR as 
breezy west winds arrive. Winds will reduce slightly into the 
evening but remain breezy as scattered low clouds affect the area. 
Winds become light to moderate in the late night as MVFR CIGs fill 
over the terminals. These CIGs look to scatter into mid Sunday 
morning.

&&

.MARINE...
(Today through Thursday)
Issued at 1155 AM PDT Sat Jun 27 2026

Breezy northwest winds continue through the morning. Stronger
winds become more widespread across the the waters this afternoon
and through the night. These strong winds and rough seas will
result in hazardous conditions for small craft across the waters
at times well into the work week. Expect gale force gusts to
develop in the northern outer waters and along coastal jet regions
over the weekend as well. Long period southwest swell will
persist through the extended forecast.

&&

.BEACHES...
Issued at 1225 AM PDT Sat Jun 27 2026

A Beach Hazards Statement has been issued for the Pacific Coast 
Beaches from this morning through Wednesday morning as long 
period southerly swell returns to the coast, creating an increased
risk of sneaker waves and strong rip currents, especially for 
south and southwest facing beaches. Hazardous beach conditions are
advertised, specifically for moderate to steeply sloped beaches 
along the Pacific Coast of the North Bay, San Mateo, Santa Cruz 
counties. Sneaker waves will run up the beach much farther than 
other waves, potentially catching beachgoers by surprise and 
resulting in people being swept into the water. Rip currents are 
strong enough to pull the strongest swimmers away from shore. Swim
near a lifeguard if possible. Stay back from the beach, and away 
from jetties, piers, beachside rocks, and other infrastructure 
near the water. Never turn your back to the ocean! 

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through late Tuesday night for CAZ006-
     505-509-529-530.

PZ...Small Craft Advisory until 3 AM PDT Sunday for Mry Bay-SF Bay N 
     of Bay Bridge.

     Small Craft Advisory from 3 PM Sunday to 3 AM PDT Monday for Mry 
     Bay.

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

     Gale Warning from 3 PM this afternoon to 3 AM PDT Sunday for Pt 
     Arena to Pt Reyes 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-
     10 nm-Pt Reyes to Pigeon Pt 0-10 nm.

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

     Gale Warning from 3 PM this afternoon to 3 AM PDT Monday for Pt 
     Arena to Pt Reyes 10-60 NM.

     Small Craft Advisory from 3 PM this afternoon to 9 AM PDT Monday 
     for Pigeon Pt to Pt Pinos 10-60 NM.

&&

$$

SHORT TERM...Malarkey
LONG TERM....Malarkey
AVIATION...Murdock
MARINE...Murdock

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Prepared by Boulder-Creek.com Weather at: Sat Jun 27 12:30:03 PDT 2026
From the National Weather Service