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whus46 kmtr 210100

coastal hazard message
national weather service san francisco bay area
600 pm pdt fri oct 20 2017

...high surf advisory expires at 6 pm and will be replaced with a
beach hazards statement through saturday evening...

.a large northwest swell of 15 to 18 feet with periods of 15 to
18 seconds peaked earlier today and will continue to taper off
through the overnight hours. this swell will result in breaking 
waves of generally around 12 to 15 feet, occasionally reaching up
to 20 feet at favored locations. these conditions will pose a 
threat to beachgoers and mariners traversing harbor entrances
through saturday evening.

san francisco-
coastal north bay including point reyes national seashore-
san francisco peninsula coast-northern monterey bay-
southern monterey bay and big sur coast-
600 pm pdt fri oct 20 2017

...beach hazards statement remains in effect through saturday
...high surf advisory will expire at 6 pm pdt this evening...

* seas...a northwesterly swell of 12 to 15 ft at 15 to 17 seconds
  will continue to create hazardous beach conditions. breaking 
  waves may reach up to 20 feet at favored locations.

* timing...through saturday evening. waves already peaked earlier
  friday and will continue to diminish overnight and into
  saturday. waves of generally around 12 to 15 feet, occasionally
  reaching up to 20 feet at favored locations.

* location...coastline from sonoma county south through monterey 
  county. in particular west to northwest facing beaches... 
  including but not limited to...ocean beach...montara state 
  beach and marina state beach. 

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. these large waves can be erratic and unpredictable. 
use extra caution near the surf zone as these large waves will be 
capable of sweeping people into the frigid and turbulent ocean 
water. mariners traversing the bar or harbor entrances are also 
urged to exercise extreme caution...or stay in port until the 
threat subsides.


precautionary/preparedness actions...

a beach hazard statement means the potentially dangerous
conditions may exist on specific beaches. these hazards may
include large shore break...strong rip currents...strong longshore
currents and possibly sneaker waves. all of which could be life
threatening. be sure to always keep your eyes on the ocean.



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