171
FZPQ50 PGUM 301854
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
454 AM CHST FRI JUL 31 2026
DISCUSSION
THERE WILL BE A MODERATE RISK OF RIP CURRENTS ALONG
SOUTH AND WEST FACING REEFS OF THE MARIANAS, WHICH COULD SPREAD TO
EAST FACING REEFS BY TONIGHT. THERE WILL ALSO BE A MODERATE RISK OF
LIGHTNING STARTING SUNDAY.
GUZ001-MPZ001>003-311000-
GUAM-ROTA-TINIAN-SAIPAN-
454 AM CHST FRI JUL 31 2026
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............1 TO 3 FEET.
EAST FACING REEFS............2 TO 4 FEET.
SOUTH FACING REEFS............3 TO 5 FEET.
WEST FACING REEFS............3 TO 5 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTH AT 1 TO 3 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............SOUTHWEST AT AROUND 3 FEET.
SECONDARY PERIOD.............8 SECONDS.
WATER TEMPERATURE
TANAPAG BUOY..........86 DEGREES.
MAX HEAT INDEX.........AROUND 104.
WINDS...............SOUTHWEST AT 10 MPH SHIFTING TO THE WEST IN
THE AFTERNOON.
TONIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............1 TO 3 FEET.
EAST FACING REEFS............4 TO 6 FEET.
SOUTH FACING REEFS............5 TO 7 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHEAST AT 2 TO 4 FEET.
PRIMARY PERIOD...............11 SECONDS.
SECONDARY SWELL..............SOUTHWEST AT AROUND 3 FEET.
SECONDARY PERIOD.............8 SECONDS.
WINDS...............WEST AT 10 TO 15 MPH.
SATURDAY
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............2 TO 4 FEET.
EAST FACING REEFS............4 TO 6 FEET.
SOUTH FACING REEFS............6 TO 8 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 3 TO 5 FEET.
PRIMARY PERIOD...............12 SECONDS.
SECONDARY SWELL..............SOUTHWEST AT AROUND 4 FEET.
SECONDARY PERIOD.............8 SECONDS.
MAX HEAT INDEX.........AROUND 103.
WINDS...............WEST AT 10 TO 20 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
HIGH TIDE 2.5 FEET AT 7:45 AM FRIDAY
LOW TIDE 0.1 FEET AT 2:53 PM FRIDAY
HIGH TIDE 2.5 FEET AT 9:47 PM FRIDAY
LOW TIDE 1.5 FEET AT 3:24 AM SATURDAY
HIGH TIDE 2.5 FEET AT 8:27 AM SATURDAY
LOW TIDE 0.2 FEET AT 3:26 PM SATURDAY
HIGH TIDE 2.5 FEET AT 10:10 PM SATURDAY
AT ROTA ISLAND...
HIGH TIDE 2.3 FEET AT 7:42 AM FRIDAY
LOW TIDE 0.0 FEET AT 2:47 PM FRIDAY
HIGH TIDE 2.3 FEET AT 9:44 PM FRIDAY
LOW TIDE 1.4 FEET AT 3:18 AM SATURDAY
HIGH TIDE 2.3 FEET AT 8:24 AM SATURDAY
LOW TIDE 0.2 FEET AT 3:20 PM SATURDAY
HIGH TIDE 2.4 FEET AT 10:07 PM SATURDAY
AT TINIAN ISLAND...
HIGH TIDE 1.8 FEET AT 7:43 AM FRIDAY
LOW TIDE 0.0 FEET AT 2:30 PM FRIDAY
HIGH TIDE 1.8 FEET AT 9:45 PM FRIDAY
LOW TIDE 0.5 FEET AT 3:01 AM SATURDAY
HIGH TIDE 1.8 FEET AT 8:25 AM SATURDAY
LOW TIDE 0.1 FEET AT 3:03 PM SATURDAY
HIGH TIDE 1.9 FEET AT 10:08 PM SATURDAY
AT TANAPAG HARBOR, SAIPAN...
HIGH TIDE 2.0 FEET AT 7:42 AM FRIDAY
LOW TIDE -0.2 FEET AT 3:03 PM FRIDAY
HIGH TIDE 2.1 FEET AT 10:18 PM FRIDAY
LOW TIDE 1.4 FEET AT 3:38 AM SATURDAY
HIGH TIDE 2.0 FEET AT 8:28 AM SATURDAY
LOW TIDE -0.1 FEET AT 3:34 PM SATURDAY
HIGH TIDE 2.2 FEET AT 10:41 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.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page