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whhw40 phfo 210132

coastal hazard message
national weather service honolulu hi
332 pm hst mon nov 20 2017

...high surf advisory in effect for the north facing shores of
niihau kauai oahu molokai maui and the big island...

.buoy observations indicate that the north swell has remained
elevated through the day and new guidance shows that the swell
will decrease tuesday morning.

niihau-kauai windward-kauai leeward-oahu north shore-oahu koolau-
olomana-molokai windward-molokai leeward-maui windward west-
maui leeward west-maui central valley-windward haleakala-
big island north and east-
332 pm hst mon nov 20 2017

...high surf advisory now in effect until noon hst tuesday...

* surf...surf will be 12 to 18 feet through tonight, lowering to
  10 to 15 feet tuesday morning.
* timing...advisory level surf is expected through tuesday
  morning, then will subside tuesday afternoon.

* impacts...moderate...expect strong breaking waves, shore 
  break, and strong longshore and rip currents making swimming 
  difficult and dangerous. 

precautionary/preparedness actions...

beachgoers, swimmers, and surfers should heed all advice given by
ocean safety officials and exercise caution. when in doubt, do
not go out.



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