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whus46 kmtr 121016

coastal hazard message
national weather service san francisco ca
216 am pst thu dec 12 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-
216 am pst thu dec 12 2019

...high surf advisory remains in effect from 3 pm this afternoon
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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