875  
FZHW52 PHFO 210150  
SRFHFO  
 
SURF ZONE FORECAST  
NATIONAL WEATHER SERVICE HONOLULU HI  
350 PM HST THU JUL 20 2017  
 
HIZ005>011-211500-  
OAHU-  
350 PM HST THU JUL 20 2017  
 
SURF ALONG NORTH FACING SHORES WILL BE 2 FEET OR LESS THROUGH  
FRIDAY.  
 
SURF ALONG WEST FACING SHORES WILL BE 2 FEET OR LESS THROUGH  
FRIDAY.  
 
SURF ALONG EAST FACING SHORES WILL BE 4 TO 6 FEET THROUGH FRIDAY.  
 
SURF ALONG SOUTH FACING SHORES WILL BE 1 TO 3 FEET THROUGH FRIDAY.  
 
OUTLOOK THROUGH THURSDAY JULY 27:  
EAST SWELLS PRODUCED BY TROPICAL CYCLONE FERNANDA ARE FORECAST TO  
INCREASE SURF HEIGHTS ALONG EAST FACING SHORES INTO EARLY NEXT WEEK.  
THESE SWELLS COMBINED WITH LOCALLY GENERATED TRADE WIND WAVES WILL  
LIKELY CAUSE SURF TO REACH THE HIGH SURF ADVISORY CRITERIA ALONG EAST  
FACING SHORES STARTING THIS WEEKEND. SOME OF THIS EAST SWELL ENERGY  
MAY WRAP AROUND TO NORTH AND SOUTH FACING SHORES. LONG TERM GUIDANCE  
SHOWS ANOTHER LONG PERIOD EAST SWELL FROM A DISTANT TROPICAL CYCLONE  
GREG REACHING THE ISLANDS TUESDAY THROUGH THURSDAY NEXT WEEK. OTHERWISE,  
ONLY SMALL SURF IS EXPECTED ELSEWHERE.  
 
SURF HEIGHTS ARE FORECAST HEIGHTS OF THE FACE, OR FRONT, OF WAVES. THE  
SURF FORECAST IS BASED ON THE SIGNIFICANT WAVE HEIGHT, THE AVERAGE  
HEIGHT OF THE ONE THIRD LARGEST WAVES, AT THE LOCATIONS OF THE LARGEST  
BREAKERS. SOME WAVES MAY BE MORE THAN TWICE AS HIGH AS THE  
SIGNIFICANT WAVE HEIGHT. EXPECT TO ENCOUNTER RIP CURRENTS IN OR NEAR  
ANY SURF ZONE.  
 

 
 
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