178
FZPQ50 PGUM 180600
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
400 PM CHST THU SEP 18 2025
DISCUSSION
THERE WILL BE A LOW RISK OF RIP CURRENTS ALONG ALL REEFS
OF THE MARIANAS THROUGH WEDNESDAY. THERE WILL ALSO BE A MODERATE RISK
OF LIGHTNING THROUGH AT LEAST FRIDAY NIGHT. A WEST SWELL COULD ARRIVE
MONDAY FROM A DEVELOPING TROPICAL DISTURBANCE THAT WILL BE FAR TO THE
WEST BY THEN.
GUZ001-MPZ001>003-181900-
GUAM-ROTA-TINIAN-SAIPAN-
400 PM CHST THU SEP 18 2025
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 PM THURSDAY
THROUGH 600 AM SATURDAY
TONIGHT
RIP CURRENT RISK.....LOW *.
SURF HEIGHT
NORTH FACING REEFS............1 TO 2 FEET.
EAST FACING REEFS............2 TO 4 FEET.
SOUTH FACING REEFS............1 TO 2 FEET.
WEST FACING REEFS............AROUND 1 FOOT.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 1 TO 3 FEET.
PRIMARY PERIOD...............8 SECONDS.
WATER TEMPERATURE
RITIDIAN BUOY..........86 DEGREES.
WINDS...............EAST AT 10 TO 15 MPH.
FRIDAY
RIP CURRENT RISK.....LOW *.
SURF HEIGHT
NORTH FACING REEFS............1 TO 2 FEET.
EAST FACING REEFS............2 TO 4 FEET.
SOUTH FACING REEFS............1 TO 2 FEET.
WEST FACING REEFS............AROUND 1 FOOT.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 1 TO 3 FEET.
PRIMARY PERIOD...............8 SECONDS.
MAX HEAT INDEX.........AROUND 101.
WINDS...............NORTH AT 10 TO 20 MPH.
FRIDAY NIGHT
RIP CURRENT RISK.....LOW *.
SURF HEIGHT
NORTH FACING REEFS............1 TO 2 FEET.
EAST FACING REEFS............2 TO 4 FEET.
SOUTH FACING REEFS............1 TO 2 FEET.
WEST FACING REEFS............AROUND 1 FOOT.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 3 FEET.
PRIMARY PERIOD...............8 SECONDS.
WINDS...............NORTHEAST AT 10 TO 20 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
HIGH TIDE 2.3 FEET AT 6:30 PM THURSDAY
LOW TIDE 1.3 FEET AT 12:02 AM FRIDAY
HIGH TIDE 2.2 FEET AT 5:07 AM FRIDAY
LOW TIDE 0.0 FEET AT 12:06 PM FRIDAY
HIGH TIDE 2.4 FEET AT 7:00 PM FRIDAY
LOW TIDE 1.1 FEET AT 12:44 AM SATURDAY
AT ROTA ISLAND...
HIGH TIDE 2.2 FEET AT 6:27 PM THURSDAY
LOW TIDE 1.3 FEET AT 11:56 PM THURSDAY
HIGH TIDE 2.1 FEET AT 5:04 AM FRIDAY
LOW TIDE 0.0 FEET AT 12:00 PM FRIDAY
HIGH TIDE 2.2 FEET AT 6:57 PM FRIDAY
LOW TIDE 1.1 FEET AT 12:38 AM SATURDAY
AT TINIAN ISLAND...
HIGH TIDE 1.5 FEET AT 6:07 PM THURSDAY
LOW TIDE 1.0 FEET AT 11:07 PM THURSDAY
HIGH TIDE 1.5 FEET AT 3:57 AM FRIDAY
LOW TIDE -0.2 FEET AT 11:30 AM FRIDAY
HIGH TIDE 1.5 FEET AT 6:34 PM FRIDAY
LOW TIDE 0.9 FEET AT 11:56 PM FRIDAY
AT TANAPAG HARBOR, SAIPAN...
HIGH TIDE 2.1 FEET AT 6:38 PM THURSDAY
LOW TIDE 1.3 FEET AT 11:56 PM THURSDAY
HIGH TIDE 2.0 FEET AT 5:11 AM FRIDAY
LOW TIDE 0.0 FEET AT 12:06 PM FRIDAY
HIGH TIDE 2.1 FEET AT 7:08 PM FRIDAY
LOW TIDE 1.1 FEET AT 12:41 AM 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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