614  
FZPQ50 PGUM 210646  
SRFGUM  
 
SURF ZONE FORECAST FOR THE MARIANA ISLANDS  
NATIONAL WEATHER SERVICE TIYAN GU  
446 PM CHST SAT DEC 21 2024  
   
SYNOPSIS  
A MODERATE RISK OF RIP CURRENTS EXISTS ALONG ALL REEFS  
DUE TO DOMINANT EAST SWELL AND BACKGROUND NORTH SWELL. A LARGER  
PULSE OF LONG-PERIOD NORTH SWELL ARRIVES SUNDAY, CREATING HAZARDOUS  
SURF AND DANGEROUS RIP CURRENTS ALONG NORTH FACING REEFS THROUGH  
MONDAY. SURF ALONG WEST FACING REEFS WILL BE NOTICEABLY ELEVATED,  
EXPECTED TO APPROACH BUT NOT TO EXCEED HAZARDOUS LEVELS AT THIS TIME.  
A MODERATE RISK OF LIGHTNING IS EXPECTED THROUGH SUNDAY.  
 
 
 
GUZ001-MPZ001>003-212200-  
GUAM-ROTA-TINIAN-SAIPAN-  
446 PM CHST SAT DEC 21 2024  
 
...HIGH RISK OF RIP CURRENTS IS NO LONGER IN EFFECT ALONG EAST FACING  
REEFS...  
...HIGH SURF ADVISORY IN EFFECT FROM 4 AM SUNDAY TO 4 AM CHST  
MONDAY ALONG NORTH FACING REEFS...  
...HIGH RISK OF RIP CURRENTS FROM SUNDAY MORNING THROUGH MONDAY  
AFTERNOON ALONG NORTH FACING REEFS...  
 
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 PM SATURDAY  
THROUGH 600 AM MONDAY  
   
TONIGHT (6 PM TO 6 AM SUNDAY)  
 
RIP CURRENT RISK.....MODERATE *.  
SURF HEIGHT  
NORTH FACING REEFS............4 TO 7 FEET.  
EAST FACING REEFS............6 TO 8 FEET.  
SOUTH FACING REEFS............3 TO 5 FEET.  
WEST FACING REEFS............4 TO 6 FEET.  
SWELL/PERIOD  
PRIMARY SWELL................EAST AT 5 TO 7 FEET.  
PRIMARY PERIOD...............9 SECONDS.  
SECONDARY SWELL..............NORTH AT 3 TO 4 FEET.  
SECONDARY PERIOD.............10 SECONDS.  
WATER TEMPERATURE  
RITIDIAN BUOY..........85 DEGREES.  
COASTAL WINDS............EAST AT 10 TO 15 MPH.  
 
   
SUNDAY AND SUNDAY NIGHT (6 AM TO 6 AM MONDAY)  
 
RIP CURRENT RISK.....HIGH. POUNDING SURF WILL PRODUCE LIFE  
THREATENING RIP CURRENTS AT REEFS AND  
BEACHES.  
SURF HEIGHT  
NORTH FACING REEFS............7 TO 10 FEET.  
EAST FACING REEFS............6 TO 8 FEET.  
SOUTH FACING REEFS............3 TO 5 FEET.  
WEST FACING REEFS............6 TO 8 FEET.  
SWELL/PERIOD  
PRIMARY SWELL................EAST AT 4 TO 6 FEET.  
PRIMARY PERIOD...............10 SECONDS.  
SECONDARY SWELL..............NORTH AT 5 TO 6 FEET.  
SECONDARY PERIOD.............12 SECONDS.  
MAXIMUM AFTERNOON HEAT INDEX...........AROUND 103.  
COASTAL WINDS............EAST AT 10 TO 15 MPH.  
   
OUTLOOK  
HAZARDOUS SWELL AND RIP CURRENTS ARE EXPECTED CONTINUE  
ALONG NORTH FACING REEFS THROUGH MONDAY AFTERNOON.  
 
TIDE INFORMATION FOR THE NEXT 36 HOURS...  
 
AT APRA HARBOR, GUAM...  
LOW TIDE 1.2 FEET AT 7:03 PM SATURDAY  
HIGH TIDE 1.5 FEET AT 11:05 PM SATURDAY  
LOW TIDE 0.1 FEET AT 6:14 AM SUNDAY  
HIGH TIDE 2.0 FEET AT 1:42 PM SUNDAY  
LOW TIDE 1.0 FEET AT 8:06 PM SUNDAY  
HIGH TIDE 1.4 FEET AT 12:24 AM MONDAY  
 
AT ROTA ISLAND...  
LOW TIDE 1.1 FEET AT 6:57 PM SATURDAY  
HIGH TIDE 1.4 FEET AT 11:02 PM SATURDAY  
LOW TIDE 0.1 FEET AT 6:08 AM SUNDAY  
HIGH TIDE 1.9 FEET AT 1:39 PM SUNDAY  
LOW TIDE 0.9 FEET AT 8:00 PM SUNDAY  
HIGH TIDE 1.3 FEET AT 12:21 AM MONDAY  
 
AT TINIAN ISLAND...  
LOW TIDE 1.1 FEET AT 6:54 PM SATURDAY  
HIGH TIDE 1.3 FEET AT 10:27 PM SATURDAY  
LOW TIDE 0.1 FEET AT 5:56 AM SUNDAY  
HIGH TIDE 1.6 FEET AT 1:29 PM SUNDAY  
LOW TIDE 0.9 FEET AT 7:57 PM SUNDAY  
HIGH TIDE 1.1 FEET AT 11:56 PM SUNDAY  
 
AT TANAPAG HARBOR, SAIPAN...  
LOW TIDE 1.4 FEET AT 7:42 PM SATURDAY  
HIGH TIDE 1.5 FEET AT 11:15 PM SATURDAY  
LOW TIDE 0.4 FEET AT 6:23 AM SUNDAY  
HIGH TIDE 2.1 FEET AT 1:56 PM SUNDAY  
LOW TIDE 1.2 FEET AT 8:44 PM SUNDAY  
HIGH TIDE 1.4 FEET AT 12:43 AM 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. IF CAUGHT IN  
A RIP CURRENT, SWIM PARALLEL TO THE BEACH RATHER THAN AGAINST THE  
CURRENT.  
 
 
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