401
FZPQ50 PGUM 301852
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
452 AM CHST FRI OCT 31 2025
DISCUSSION
THERE WILL BE A MODERATE RISK FOR RIP CURRENTS ALONG NORTH AND EAST
FACING REEFS THROUGH TONIGHT. A MODERATE RISK FOR RIP CURRENTS IS
EXPECTED FOR SOUTH FACING REEFS TONIGHT AS WELL. A TRADE-WIND SWELL
WILL MOVE INTO THE REGION THIS WEEKEND BRINGING THE CHANCE FOR
HAZARDOUS SURF AND A HIGH RISK FOR RIP CURRENTS LATE THIS WEEKEND
AND INTO NEXT WEEK. THERE WILL BE A MODERATE RISK FOR THUNDERSTORMS
ON SATURDAY AND AGAIN SUNDAY NIGHT THROUGH WEDNESDAY.
GUZ001-MPZ001>003-311000-
GUAM-ROTA-TINIAN-SAIPAN-
452 AM CHST FRI OCT 31 2025
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 AM FRIDAY
THROUGH 600 PM SATURDAY
TODAY
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............4 TO 6 FEET.
EAST FACING REEFS............6 TO 8 FEET.
SOUTH FACING REEFS............2 TO 4 FEET.
WEST FACING REEFS............1 TO 3 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 4 TO 6 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............SOUTH AT AROUND 1 FOOT.
SECONDARY PERIOD.............11 SECONDS.
WATER TEMPERATURE
RITIDIAN BUOY..........86 DEGREES.
MAX HEAT INDEX.........AROUND 101.
WINDS...............EAST AT 10 TO 15 MPH.
TONIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 5 FEET.
EAST FACING REEFS............5 TO 7 FEET.
SOUTH FACING REEFS............3 TO 5 FEET.
WEST FACING REEFS............2 TO 4 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 3 TO 5 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............NORTH AT AROUND 2 FEET.
SECONDARY PERIOD.............11 SECONDS.
WINDS...............EAST AT 10 TO 15 MPH.
SATURDAY
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 5 FEET.
EAST FACING REEFS............5 TO 7 FEET.
SOUTH FACING REEFS............3 TO 5 FEET.
WEST FACING REEFS............2 TO 4 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 3 TO 5 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............NORTH AT 1 TO 3 FEET.
SECONDARY PERIOD.............11 SECONDS.
MAX HEAT INDEX.........AROUND 103.
WINDS...............EAST AT 10 TO 20 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
LOW TIDE 0.1 FEET AT 8:34 AM FRIDAY
HIGH TIDE 2.2 FEET AT 4:11 PM FRIDAY
LOW TIDE 1.2 FEET AT 10:15 PM FRIDAY
HIGH TIDE 1.7 FEET AT 2:49 AM SATURDAY
LOW TIDE 0.2 FEET AT 9:33 AM SATURDAY
HIGH TIDE 2.3 FEET AT 4:40 PM SATURDAY
LOW TIDE 0.9 FEET AT 10:54 PM SATURDAY
AT ROTA ISLAND...
LOW TIDE 0.1 FEET AT 8:28 AM FRIDAY
HIGH TIDE 2.0 FEET AT 4:08 PM FRIDAY
LOW TIDE 1.1 FEET AT 10:09 PM FRIDAY
HIGH TIDE 1.6 FEET AT 2:46 AM SATURDAY
LOW TIDE 0.2 FEET AT 9:27 AM SATURDAY
HIGH TIDE 2.1 FEET AT 4:37 PM SATURDAY
LOW TIDE 0.8 FEET AT 10:48 PM SATURDAY
AT TINIAN ISLAND...
LOW TIDE 0.0 FEET AT 8:08 AM FRIDAY
HIGH TIDE 1.5 FEET AT 3:46 PM FRIDAY
LOW TIDE 0.9 FEET AT 9:34 PM FRIDAY
HIGH TIDE 1.2 FEET AT 1:43 AM SATURDAY
LOW TIDE 0.1 FEET AT 8:57 AM SATURDAY
HIGH TIDE 1.5 FEET AT 4:05 PM SATURDAY
LOW TIDE 0.7 FEET AT 10:15 PM SATURDAY
AT TANAPAG HARBOR, SAIPAN...
LOW TIDE 0.2 FEET AT 8:43 AM FRIDAY
HIGH TIDE 2.1 FEET AT 4:24 PM FRIDAY
LOW TIDE 1.2 FEET AT 10:22 PM FRIDAY
HIGH TIDE 1.6 FEET AT 2:46 AM SATURDAY
LOW TIDE 0.3 FEET AT 9:41 AM SATURDAY
HIGH TIDE 2.1 FEET AT 4:50 PM SATURDAY
LOW TIDE 0.9 FEET AT 10:55 PM SATURDAY
* 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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