415  
FZPQ50 PGUM 220034 AAA  
SRFGUM  
 
SURF ZONE FORECAST FOR THE MARIANA ISLANDS...UPDATED  
NATIONAL WEATHER SERVICE TIYAN GU  
1034 AM CHST SUN DEC 22 2024  
 
UPDATED TO INCREASE SURF ALONG WEST, NORTH AND EAST REEFS AND  
UPDATED HEADLINES, SYNOPSIS, AND OUTLOOK.  
   
SYNOPSIS
 
A HIGH RISK OF RIP CURRENTS EXISTS ALONG NORTH, WEST AND  
EAST FACING REEFS. A LARGER PULSE OF LONG-PERIOD NORTH SWELL HAS  
ARRIVED, CREATING HAZARDOUS SURF AND DANGEROUS RIP CURRENTS ALONG  
NORTH AND WEST FACING REEFS THROUGH MONDAY. A MODERATE RISK OF  
LIGHTNING IS EXPECTED THROUGH TODAY.  
 

 
 
GUZ001-MPZ001>003-221545-  
GUAM-ROTA-TINIAN-SAIPAN-  
1034 AM CHST SUN DEC 22 2024  
 
...HIGH SURF ADVISORY IN EFFECT ALONG WEST AND NORTH FACING REEFS  
UNTIL 4 PM CHST MONDAY ...    
..HIGH RISK OF RIP CURRENTS ALONG WEST
 
NORTH AND EAST FACING  
REEFS THROUGH MONDAY AFTERNOON...  
 
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 1014 AM SUNDAY  
THROUGH 600 PM MONDAY  
   
REST OF TODAY
 
 
RIP CURRENT RISK.....HIGH. POUNDING SURF WILL PRODUCE LIFE  
THREATENING RIP CURRENTS AT REEFS AND  
BEACHES.  
SURF HEIGHT  
NORTH FACING REEFS............8 TO 12 FEET.  
EAST FACING REEFS............7 TO 9 FEET.  
SOUTH FACING REEFS............2 TO 4 FEET.  
WEST FACING REEFS............7 TO 9 FEET.  
SWELL/PERIOD  
PRIMARY SWELL................NORTH AT AROUND 8 FEET.  
PRIMARY PERIOD...............12 SECONDS.  
SECONDARY SWELL..............EAST AT 3 TO 6 FEET.  
SECONDARY PERIOD.............10 SECONDS.  
WATER TEMPERATURE  
RITIDIAN BUOY..........84 DEGREES.  
MAXIMUM AFTERNOON HEAT INDEX...........AROUND 103.  
COASTAL WINDS............EAST AT 10 TO 15 MPH.  
   
TONIGHT AND MONDAY (6 PM TO 6 PM MONDAY)
 
 
RIP CURRENT RISK.....HIGH *.  
SURF HEIGHT  
NORTH FACING REEFS............7 TO 11 FEET.  
EAST FACING REEFS............6 TO 9 FEET.  
SOUTH FACING REEFS............2 TO 4 FEET.  
WEST FACING REEFS............6 TO 9 FEET.  
SWELL/PERIOD  
PRIMARY SWELL................NORTH 7 TO 8 FEET.  
PRIMARY PERIOD...............12 SECONDS.  
SECONDARY SWELL..............EAST AT 4 TO 6 FEET.  
SECONDARY PERIOD.............9 SECONDS.  
COASTAL WINDS............EAST AT 10 TO 15 MPH.  
   
OUTLOOK
 
NORTH SWELL GRADUALLY SUBSIDES ALLOWING FOR SURF AND  
RIP RISK TO DROP BELOW HAZARDOUS LEVELS BY MONDAY NIGHT.  
 
TIDE INFORMATION FOR THE NEXT 36 HOURS...  
 
AT APRA HARBOR, GUAM...  
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  
LOW TIDE 0.4 FEET AT 6:57 AM MONDAY  
HIGH TIDE 2.0 FEET AT 2:11 PM MONDAY  
LOW TIDE 0.8 FEET AT 9:03 PM MONDAY  
HIGH TIDE 1.3 FEET AT 2:12 AM TUESDAY  
 
AT ROTA ISLAND...  
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  
LOW TIDE 0.4 FEET AT 6:51 AM MONDAY  
HIGH TIDE 1.9 FEET AT 2:08 PM MONDAY  
LOW TIDE 0.7 FEET AT 8:57 PM MONDAY  
HIGH TIDE 1.2 FEET AT 2:09 AM TUESDAY  
 
AT TINIAN ISLAND...  
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  
LOW TIDE 0.4 FEET AT 6:31 AM MONDAY  
HIGH TIDE 1.6 FEET AT 1:48 PM MONDAY  
LOW TIDE 0.7 FEET AT 8:49 PM MONDAY  
HIGH TIDE 1.0 FEET AT 1:39 AM TUESDAY  
 
AT TANAPAG HARBOR, SAIPAN...  
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 TIDE 0.7 FEET AT 7:04 AM MONDAY  
HIGH TIDE 2.0 FEET AT 2:23 PM MONDAY  
LOW TIDE 0.9 FEET AT 9:35 PM MONDAY  
HIGH TIDE 1.3 FEET AT 2:32 AM TUESDAY  
 
* 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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