253  
FZPQ50 PGUM 240531  
SRFGUM  
 
SURF ZONE FORECAST FOR THE MARIANA ISLANDS  
NATIONAL WEATHER SERVICE TIYAN GU  
331 PM CHST FRI SEP 24 2021  
   
SYNOPSIS
 
THERE WILL BE A MODERATE RISK OF RIP CURRENTS ALONG EAST  
AND SOUTH FACING REEFS. THE RIP CURRENT RISK WILL THEN INCREASE TO  
MODERATE ALONG WEST FACING REEFS SATURDAY NIGHT. THERE WILL BE A  
MODERATE RISK OF LIGHTNING THROUGH SATURDAY, BECOMING A SLIGHT RISK  
SATURDAY EVENING.  
 

 
 
GUZ001>004-242100-  
GUAM-ROTA-TINIAN-SAIPAN-  
331 PM CHST FRI SEP 24 2021  
 
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 PM FRIDAY  
THROUGH 600 AM SUNDAY  
   
TONIGHT (6 PM TO 6 AM SATURDAY)
 
 
COASTAL WINDS............SOUTHEAST AT 10 TO 20 MPH.  
SURF ALONG NORTH FACING REEFS............1 TO 3 FEET.  
SURF ALONG EAST FACING REEFS............4 TO 6 FEET.  
SURF ALONG SOUTH FACING REEFS............5 TO 8 FEET.  
SURF ALONG WEST FACING REEFS............2 TO 4 FEET.  
PRIMARY SWELL...............SOUTH AT 3 TO 6 FEET.  
PRIMARY PERIOD..............8 SECONDS.  
SECONDARY SWELL...............EAST AT AROUND 4 FEET.  
SECONDARY PERIOD..............8 SECONDS.  
 
RIP CURRENT RISK.....MODERATE. WAVE CONDITIONS SUPPORT STRONGER OR  
MORE FREQUENT RIP CURRENTS. ALWAYS HAVE A  
FLOTATION DEVICE WITH YOU IN THE WATER.  
 
SEA SURFACE TEMPERATURE AT IPAN BUOY...85 DEGREES.  
   
SATURDAY (6 AM TO 6 PM)
 
 
COASTAL WINDS............SOUTHEAST AT 10 TO 15 MPH.  
SURF ALONG NORTH FACING REEFS............1 TO 3 FEET.  
SURF ALONG EAST FACING REEFS............3 TO 5 FEET.  
SURF ALONG SOUTH FACING REEFS............5 TO 7 FEET.  
SURF ALONG WEST FACING REEFS............3 TO 5 FEET.  
PRIMARY SWELL...............SOUTH AT 3 TO 5 FEET.  
PRIMARY PERIOD..............8 SECONDS.  
SECONDARY SWELL...............EAST AT AROUND 3 FEET.  
SECONDARY PERIOD..............8 SECONDS.  
 
RIP CURRENT RISK.....MODERATE. WAVE CONDITIONS SUPPORT STRONGER OR  
MORE FREQUENT RIP CURRENTS. ALWAYS HAVE A  
FLOTATION DEVICE WITH YOU IN THE WATER.  
 
MAXIMUM AFTERNOON HEAT INDEX...........AROUND 97.  
   
SATURDAY NIGHT (6 PM TO 6 AM SUNDAY)
 
 
COASTAL WINDS............SOUTHEAST AT AROUND 10 MPH.  
SURF ALONG NORTH FACING REEFS............1 TO 3 FEET.  
SURF ALONG EAST FACING REEFS............3 TO 5 FEET.  
SURF ALONG SOUTH FACING REEFS............4 TO 6 FEET.  
SURF ALONG WEST FACING REEFS............4 TO 6 FEET.  
PRIMARY SWELL...............SOUTHWEST AT 2 TO 4 FEET.  
PRIMARY PERIOD..............8 SECONDS.  
SECONDARY SWELL...............EAST AT AROUND 3 FEET.  
SECONDARY PERIOD..............9 SECONDS.  
 
RIP CURRENT RISK.....MODERATE. WAVE CONDITIONS SUPPORT STRONGER OR  
MORE FREQUENT RIP CURRENTS. ALWAYS HAVE A  
FLOTATION DEVICE WITH YOU IN THE WATER.  
   
OUTLOOK
 
SURF WILL BUILD 1 TO 2 FEET ALONG WEST FACING REEFS  
THROUGH MONDAY.  
 
TIDE INFORMATION FOR THE NEXT 36 HOURS...  
 
AT APRA HARBOR, GUAM...  
HIGH TIDE 2.2 FEET AT 9:18 PM FRIDAY  
LOW TIDE 0.4 FEET AT 4:03 AM SATURDAY  
HIGH TIDE 2.1 FEET AT 10:30 AM SATURDAY  
LOW TIDE 1.2 FEET AT 4:19 PM SATURDAY  
HIGH TIDE 2.1 FEET AT 9:40 PM SATURDAY  
LOW TIDE 0.3 FEET AT 4:38 AM SUNDAY  
 
AT ROTA ISLAND...  
HIGH TIDE 2.1 FEET AT 9:15 PM FRIDAY  
LOW TIDE 0.4 FEET AT 3:57 AM SATURDAY  
HIGH TIDE 2.0 FEET AT 10:27 AM SATURDAY  
LOW TIDE 1.1 FEET AT 4:13 PM SATURDAY  
HIGH TIDE 2.0 FEET AT 9:37 PM SATURDAY  
LOW TIDE 0.3 FEET AT 4:32 AM SUNDAY  
 
AT TINIAN ISLAND...  
HIGH TIDE 1.6 FEET AT 8:45 PM FRIDAY  
LOW TIDE 0.3 FEET AT 3:45 AM SATURDAY  
HIGH TIDE 1.4 FEET AT 10:37 AM SATURDAY  
LOW TIDE 1.0 FEET AT 4:10 PM SATURDAY  
HIGH TIDE 1.5 FEET AT 9:05 PM SATURDAY  
LOW TIDE 0.2 FEET AT 4:24 AM SUNDAY  
 
AT TANAPAG HARBOR, SAIPAN...  
HIGH TIDE 1.9 FEET AT 9:36 PM FRIDAY  
LOW TIDE 0.4 FEET AT 4:13 AM SATURDAY  
HIGH TIDE 1.9 FEET AT 10:58 AM SATURDAY  
LOW TIDE 1.1 FEET AT 4:23 PM SATURDAY  
HIGH TIDE 1.9 FEET AT 9:54 PM SATURDAY  
LOW TIDE 0.4 FEET AT 4:49 AM SUNDAY  
 

 
 
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