378  
FZPQ50 PGUM 181855  
SRFGUM  
 
SURF ZONE FORECAST FOR THE MARIANA ISLANDS  
NATIONAL WEATHER SERVICE TIYAN GU  
455 AM CHST SUN OCT 19 2025  
   
DISCUSSION
 
THERE WILL BE A MODERATE RISK OF RIP CURRENTS MOST OF  
THIS WEEK ALONG NORTH AND EAST FACING REEFS OF THE MARIANAS. A  
MODERATE RISK OF LIGHTNING COULD RETURN AROUND THURSDAY.  
 

 
 
GUZ001-MPZ001>003-191000-  
GUAM-ROTA-TINIAN-SAIPAN-  
455 AM CHST SUN OCT 19 2025  
 
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 AM SUNDAY  
THROUGH 600 PM MONDAY  
   
TODAY
 
 
RIP CURRENT RISK.....MODERATE *.  
SURF HEIGHT  
NORTH FACING REEFS............4 TO 6 FEET.  
EAST FACING REEFS............4 TO 6 FEET.  
SOUTH FACING REEFS............1 TO 3 FEET.  
WEST FACING REEFS............1 TO 3 FEET.  
SWELL/PERIOD  
PRIMARY SWELL................EAST AT 3 TO 5 FEET.  
PRIMARY PERIOD...............9 SECONDS.  
SECONDARY SWELL..............NORTH AT 2 TO 3 FEET.  
SECONDARY PERIOD.............10 SECONDS.  
WATER TEMPERATURE  
RITIDIAN BUOY..........86 DEGREES.  
MAX HEAT INDEX.........AROUND 102.  
WINDS...............EAST AT 15 TO 20 MPH.  
   
TONIGHT
 
 
RIP CURRENT RISK.....MODERATE *.  
SURF HEIGHT  
NORTH FACING REEFS............4 TO 6 FEET.  
EAST FACING REEFS............4 TO 6 FEET.  
SOUTH FACING REEFS............1 TO 3 FEET.  
WEST FACING REEFS............1 TO 3 FEET.  
SWELL/PERIOD  
PRIMARY SWELL................EAST AT 3 TO 5 FEET.  
PRIMARY PERIOD...............9 SECONDS.  
SECONDARY SWELL..............NORTH AT AROUND 2 FEET.  
SECONDARY PERIOD.............10 SECONDS.  
WINDS...............EAST AT 10 TO 20 MPH.  
   
MONDAY
 
 
RIP CURRENT RISK.....MODERATE *.  
SURF HEIGHT  
NORTH FACING REEFS............4 TO 6 FEET.  
EAST FACING REEFS............4 TO 6 FEET.  
SOUTH FACING REEFS............1 TO 3 FEET.  
WEST FACING REEFS............1 TO 3 FEET.  
SWELL/PERIOD  
PRIMARY SWELL................EAST AT 3 TO 5 FEET.  
PRIMARY PERIOD...............9 SECONDS.  
SECONDARY SWELL..............NORTH AT 2 TO 3 FEET.  
SECONDARY PERIOD.............13 SECONDS.  
MAX HEAT INDEX.........AROUND 100.  
WINDS...............EAST AT 10 TO 15 MPH.  
 
TIDE INFORMATION FOR THE NEXT 36 HOURS...  
 
AT APRA HARBOR, GUAM...  
HIGH TIDE 2.0 FEET AT 6:14 AM SUNDAY  
LOW TIDE 0.6 FEET AT 12:18 PM SUNDAY  
HIGH TIDE 2.3 FEET AT 6:30 PM SUNDAY  
LOW TIDE 0.4 FEET AT 12:58 AM MONDAY  
HIGH TIDE 2.1 FEET AT 7:03 AM MONDAY  
LOW TIDE 0.8 FEET AT 12:56 PM MONDAY  
HIGH TIDE 2.3 FEET AT 6:48 PM MONDAY  
 
AT ROTA ISLAND...  
HIGH TIDE 1.9 FEET AT 6:11 AM SUNDAY  
LOW TIDE 0.5 FEET AT 12:12 PM SUNDAY  
HIGH TIDE 2.1 FEET AT 6:27 PM SUNDAY  
LOW TIDE 0.4 FEET AT 12:52 AM MONDAY  
HIGH TIDE 2.0 FEET AT 7:00 AM MONDAY  
LOW TIDE 0.7 FEET AT 12:50 PM MONDAY  
HIGH TIDE 2.1 FEET AT 6:45 PM MONDAY  
 
AT TINIAN ISLAND...  
HIGH TIDE 1.3 FEET AT 5:22 AM SUNDAY  
LOW TIDE 0.4 FEET AT 11:32 AM SUNDAY  
HIGH TIDE 1.5 FEET AT 5:48 PM SUNDAY  
LOW TIDE 0.3 FEET AT 12:26 AM MONDAY  
HIGH TIDE 1.3 FEET AT 6:26 AM MONDAY  
LOW TIDE 0.6 FEET AT 12:09 PM MONDAY  
HIGH TIDE 1.5 FEET AT 6:04 PM MONDAY  
 
AT TANAPAG HARBOR, SAIPAN...  
HIGH TIDE 1.9 FEET AT 6:25 AM SUNDAY  
LOW TIDE 0.6 FEET AT 12:17 PM SUNDAY  
HIGH TIDE 2.1 FEET AT 6:35 PM SUNDAY  
LOW TIDE 0.5 FEET AT 12:57 AM MONDAY  
HIGH TIDE 1.9 FEET AT 7:16 AM MONDAY  
LOW TIDE 0.8 FEET AT 12:57 PM MONDAY  
HIGH TIDE 2.1 FEET AT 6:56 PM MONDAY  
 
* LOW RISK OF RIP CURRENTS - STRONG CURRENTS CAN STILL OCCUR NEAR  
JETTIES AND REEF CHANNELS. ALWAYS HAVE A FLOTATION DEVICE WITH YOU  
IN THE WATER.  
 
MODERATE RISK OF RIP CURRENTS - WAVE CONDITIONS SUPPORT STRONGER OR  
MORE FREQUENT RIP CURRENTS. ALWAYS HAVE A FLOTATION DEVICE WITH YOU  
IN THE WATER.  
 
HIGH RISK OF RIP CURRENTS - LARGE WAVES WILL PRODUCE STRONG RIP  
CURRENTS, ESPECIALLY ALONG NARROW REEFS AND BEACHES. RIP CURRENTS  
WILL BE LIFE THREATENING. IF CAUGHT IN A RIP CURRENT, SWIM PARALLEL  
TO THE BEACH RATHER THAN AGAINST THE CURRENT.  
 

 
 
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