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High Surf Advisory

Coastal Hazard Message
National Weather Service San Francisco CA
658 PM PST Tue Nov 24 2020

...Breaking Waves and Coastal Runup Wednesday into Thanksgiving...

.A large northwest swell train will arrive early Wednesday and
persist to at least noon on Thanksgiving Day. Long period
forerunners will arrive as early as tonight and may result in
infrequent sneaker waves and stronger rip currents through at
least sunrise Wednesday preceeding the high surf. Then, swell
heights will build to 14 to 16 feet at 16 to 19 seconds through
the day Wednesday which will result in large breaking waves of 18
to 24 feet, largest on northwest facing beaches. Brisk northwest
winds will be at the back of these northwest waves on Wednesday
and lead to enhanced coastal runup that can shift the shoreline
farther inland than individuals are accustomed to, and in some
cases at shallow northwest beaches, envelop most of or all of the
beach. Winds turn offshore Thursday which will allow large
breakers to persist through at least midday. In addition, enhanced
coastal erosion of the summer beach profiles will continue in
earnest with this large swell. Anomalously cool water temperatures
and turbulent, unpredictable seas will lead to hazardous
conditions along the coast. It is recommended that individuals
stay off rocks and coastal jetties if visiting the coastline and
remain vigilant of their surroundings until a safe distance from
the coast.

San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
Southern Monterey Bay and Big Sur Coast-
658 PM PST Tue Nov 24 2020


* WAVES AND SURF...Large breaking waves 18 to 24 feet along
  northwest facing coastlines.

* TIMING...6 AM Wednesday to Noon on Thanksgiving (Thursday).
  Long period forerunners will arrive Tuesday Night into
  Wednesday morning. Swell subsides late Thursday.

* IMPACTS...Large breaking waves in the surf zone and on
  beaches. These large waves can be erratic and unpredictable
  and may injure or knock beachgoers into the cold, turbulent
  ocean. Brisk winds at the back of these large breaking waves
  on Wednesday will enhance coastal runup on beaches and
  increase coastal erosion, especially at northwest beaches.
  Winds turn offshore on Thursday which will allow continued
  large breakers through at least midday.


A High Surf Advisory means that high surf will affect beaches in
the advisory area, producing large breaking waves, rip currents,
localized beach erosion and sneaker waves.



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