625  
FZPQ50 PGUM 172003  
SRFGUM  
 
SURF ZONE FORECAST FOR THE MARIANA ISLANDS  
NATIONAL WEATHER SERVICE TIYAN GU  
603 AM CHST SUN APR 18 2021  
   
SYNOPSIS
 
SWELL FROM DISTANT SUPER TYPHOON SURIGAE WILL MAINTAIN  
HAZARDOUS SURF ALONG WEST FACING REEFS THE NEXT FEW DAYS. THE RIP  
CURRENT RISK WILL BE HIGH ON WEST FACING REEFS AND MODERATE ON  
NORTH...EAST AND SOUTH EXPOSURES THROUGH THE WEEK.  
 

 
 
GUZ001>004-180900-  
GUAM-ROTA-TINIAN-SAIPAN-  
603 AM CHST SUN APR 18 2021  
   
..HIGH SURF ADVISORY REMAINS IN EFFECT ALONG WEST FACING REEFS
 
 
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 AM SUNDAY  
THROUGH 600 PM MONDAY  
   
TODAY THROUGH MONDAY (6 AM TO 6 PM MONDAY)
 
 
COASTAL WINDS............NORTHEAST AT 10 TO 15 MPH...  
BECOMING EAST AT 10 TO 15 MPH TONIGHT  
SURF ALONG NORTH FACING REEFS............4 TO 6 FEET.  
SURF ALONG EAST FACING REEFS............4 TO 6 FEET.  
SURF ALONG SOUTH FACING REEFS............5 TO 7 FEET.  
SURF ALONG WEST FACING REEFS............9 TO 11 FEET.  
PRIMARY SWELL...............WEST AT AROUND 7 FEET.  
PRIMARY PERIOD..............12 SECONDS.  
SECONDARY SWELL...............NORTHEAST AT AROUND 3 FEET.  
SECONDARY PERIOD..............11 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 95.  
 
   
OUTLOOK
 
LITTLE CHANGE THE NEXT SEVERAL DAYS.  
 
TIDE INFORMATION FOR THE NEXT 36 HOURS...  
 
AT APRA HARBOR, GUAM...  
LOW TIDE 1.6 FEET AT 5:43 AM SUNDAY  
HIGH TIDE 2.0 FEET AT 10:14 AM SUNDAY  
LOW TIDE 0.1 FEET AT 5:47 PM SUNDAY  
HIGH TIDE 2.1 FEET AT 1:35 AM MONDAY  
LOW TIDE 1.7 FEET AT 6:46 AM MONDAY  
HIGH TIDE 1.9 FEET AT 10:57 AM MONDAY  
LOW TIDE 0.1 FEET AT 6:43 PM MONDAY  
 
AT ROTA ISLAND...  
HIGH TIDE 1.9 FEET AT 10:11 AM SUNDAY  
LOW TIDE 0.1 FEET AT 5:41 PM SUNDAY  
HIGH TIDE 2.0 FEET AT 1:32 AM MONDAY  
LOW TIDE 1.6 FEET AT 6:40 AM MONDAY  
HIGH TIDE 1.8 FEET AT 10:54 AM MONDAY  
LOW TIDE 0.1 FEET AT 6:37 PM MONDAY  
HIGH TIDE 2.0 FEET AT 2:44 AM TUESDAY  
 
AT TINIAN ISLAND...  
LOW TIDE 1.3 FEET AT 5:44 AM SUNDAY  
HIGH TIDE 1.4 FEET AT 9:11 AM SUNDAY  
LOW TIDE 0.0 FEET AT 5:31 PM SUNDAY  
HIGH TIDE 1.5 FEET AT 2:39 AM MONDAY  
LOW TIDE 1.3 FEET AT 6:54 AM MONDAY  
HIGH TIDE 1.4 FEET AT 9:57 AM MONDAY  
LOW TIDE 0.0 FEET AT 6:29 PM MONDAY  
 
AT TANAPAG HARBOR, SAIPAN...  
LOW TIDE 1.6 FEET AT 6:00 AM SUNDAY  
HIGH TIDE 1.8 FEET AT 9:46 AM SUNDAY  
LOW TIDE 0.2 FEET AT 5:54 PM SUNDAY  
HIGH TIDE 2.0 FEET AT 2:08 AM MONDAY  
LOW TIDE 1.6 FEET AT 7:24 AM MONDAY  
HIGH TIDE 1.7 FEET AT 10:27 AM MONDAY  
LOW TIDE 0.2 FEET AT 6:53 PM MONDAY  
 

 
 
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