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whus46 kmtr 112225

coastal hazard message
national weather service san francisco ca
225 pm pst wed dec 11 2019

san francisco-
coastal north bay including point reyes national seashore-
san francisco peninsula coast-northern monterey bay-
southern monterey bay and big sur coast-
225 pm pst wed dec 11 2019

...high surf advisory remains in effect from 3 pm thursday to
3 am pst saturday...

* waves and surf...northwest swells 12 to 14 feet at 17 to 18 
  second periods. breakers of 16 to 22 feet possible.

* timing...thursday night through early saturday morning.

* high tide...high tide will correspond with the peak of the swell
  friday morning between 10 am and 12 noon. localized coastal
  flooding possible as a result of increased wave run-up.

* impacts...large breaking waves along the coast will lead to
  increased wave run-up on beaches with waves topping and washing
  over large rocks and jetties. use extra caution near the surf 
  zone as these large waves will be capable of sweeping people 
  into the frigid and turbulent ocean water. cold water shock may 
  cause cardiac arrest, and it also can cause an involuntary gasp 
  reflex causing drowning, even for a good swimmer. long periods 
  increases the risk of rip currents. the surf zone will be 
  dangerous due to strong currents and powerful breaking waves.

precautionary/preparedness actions...

a high surf advisory means that high surf will affect beaches in
the advisory area, producing rip currents, localized beach
erosion and sneaker waves.



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