974  
FZMY50 PGUM 152021  
SRFMY  
 
SURF ZONE FORECAST FOR THE MARIANA ISLANDS  
NATIONAL WEATHER SERVICE TIYAN GU  
621 AM CHST THU AUG 16 2018  
   
SYNOPSIS
 
THERE WILL BE A HIGH RISK OF RIP CURRENTS ALONG SOUTH  
AND EAST FACING REEFS TODAY, WITH A MODERATE RISK ELSEWHERE. THE  
HIGH RISK WILL SHIFT FROM EAST TO WEST FACING REEFS TONIGHT. THERE  
WILL ALSO BE A MODERATE RISK OF LIGHTNING THROUGH AT LEAST THE  
WEEKEND.  
 

 
 
GUZ001>004-161130-  
GUAM-ROTA-TINIAN-SAIPAN-  
621 AM CHST THU AUG 16 2018  
 
...HIGH SURF ADVISORY IN EFFECT UNTIL 5 AM CHST MONDAY ALONG SOUTH  
FACING REEFS...  
   
TODAY (6 AM TO 6 PM)
 
 
COASTAL WINDS............WINDY. SOUTH AT 20 TO 30 MPH.  
SURF ALONG NORTH FACING REEFS............2 TO 5 FEET.  
SURF ALONG EAST FACING REEFS............8 TO 11 FEET.  
SURF ALONG SOUTH FACING REEFS............7 TO 10 FEET.  
SURF ALONG WEST FACING REEFS............3 TO 6 FEET.  
PRIMARY SWELL...............SOUTH AT 4 TO 9 FEET.  
PRIMARY PERIOD..............9 SECONDS.  
SECONDARY SWELL...............EAST AT AROUND 3 FEET.  
SECONDARY PERIOD..............15 SECONDS.  
 
RIP CURRENT RISK.....HIGH. POUNDING SURF WILL PRODUCE LIFE  
THREATENING RIP CURRENTS AT REEFS AND BEACHES.  
 
SEA SURFACE TEMPERATURE AT RITIDIAN BUOY...84 DEGREES.  
MAXIMUM AFTERNOON HEAT INDEX...........AROUND 97.  
   
TONIGHT (6 PM TO 6 AM)
 
 
COASTAL WINDS............BREEZY. SOUTH AT 15 TO 25 MPH.  
SURF ALONG NORTH FACING REEFS............2 TO 5 FEET.  
SURF ALONG EAST FACING REEFS............5 TO 8 FEET.  
SURF ALONG SOUTH FACING REEFS............8 TO 11 FEET.  
SURF ALONG WEST FACING REEFS............7 TO 10 FEET.  
PRIMARY SWELL...............SOUTH AT 5 TO 10 FEET.  
PRIMARY PERIOD..............10 SECONDS.  
SECONDARY SWELL...............EAST AT AROUND 2 FEET.  
SECONDARY PERIOD..............14 SECONDS.  
 
RIP CURRENT RISK.....HIGH. POUNDING SURF WILL PRODUCE LIFE  
THREATENING RIP CURRENTS AT REEFS AND BEACHES.  
   
OUTLOOK
 
SURF ON SOUTH AND EAST FACING REEFS WILL DIMINISH WHILE  
SURF ON NORTH FACING REEFS COULD BUILD FRIDAY INTO THE WEEKEND.  
 
TIDE INFORMATION FOR THE NEXT 24 HOURS...  
 
AT APRA HARBOR, GUAM...  
HIGH TIDE 2.2 FEET AT 11:07 AM THURSDAY  
LOW TIDE 0.5 FEET AT 5:30 PM THURSDAY  
HIGH TIDE 2.4 FEET AT 11:42 PM THURSDAY  
LOW TIDE 0.5 FEET AT 6:24 AM FRIDAY  
 
AT ROTA ISLAND...  
HIGH TIDE 2.0 FEET AT 11:04 AM THURSDAY  
LOW TIDE 0.5 FEET AT 5:24 PM THURSDAY  
HIGH TIDE 2.3 FEET AT 11:39 PM THURSDAY  
LOW TIDE 0.5 FEET AT 6:18 AM FRIDAY  
 
AT TINIAN ISLAND...  
HIGH TIDE 1.6 FEET AT 11:05 AM THURSDAY  
LOW TIDE 0.2 FEET AT 5:07 PM THURSDAY  
HIGH TIDE 1.8 FEET AT 11:40 PM THURSDAY  
LOW TIDE 0.2 FEET AT 6:01 AM FRIDAY  
 
AT TANAPAG HARBOR, SAIPAN...  
HIGH TIDE 1.9 FEET AT 11:30 AM THURSDAY  
LOW TIDE 0.5 FEET AT 5:40 PM THURSDAY  
HIGH TIDE 2.2 FEET AT 12:08 AM FRIDAY  
LOW TIDE 0.5 FEET AT 6:44 AM FRIDAY  
 

 
 
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