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whus46 kmtr 190554

coastal hazard message
national weather service san francisco bay area
954 pm pst tue dec 18 2018

...another large, long period west to northwest swell will result
in high surf wednesday into wednesday night...

san francisco-
coastal north bay including point reyes national seashore-
san francisco peninsula coast-northern monterey bay-
southern monterey bay and big sur coast-
954 pm pst tue dec 18 2018

...high surf advisory remains in effect until 3 am pst thursday...

* waves and surf...west to northwest swell will gradually 
  subside overnight ahead of our next large, long period west to 
  northwest swell. this swell will result in breakers of 15 to 
  25 feet with breakers up to 30 feet at favored break points 
  along the coast. 

* timing...erratic and unpredictable waves will continue through 
  wednesday morning. energetic waves will then build during the 
  day wednesday before gradually subsiding thursday morning. 

* 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. 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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