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CA- san francisco

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>Marine Weather Warning

whus46 kmtr 251658

coastal hazard message
national weather service san francisco ca
858 am pst wed nov 25 2020

...breaking waves and coastal runup wednesday into thanksgiving...

.a large northwest swell train has arrived and will persist until 
at least noon on thanksgiving day. 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-
858 am pst wed nov 25 2020

...high surf advisory remains in effect until noon pst thursday...

* waves and surf...large breaking waves 18 to 24 feet along 
  northwest facing coastlines. 

* timing...today until noon on thanksgiving (thursday). 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. 

precautionary/preparedness actions...

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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