644
FZPQ50 PGUM 180618
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
418 PM CHST THU JUN 18 2026
DISCUSSION
THERE WILL BE A MODERATE RISK OF RIP CURRENTS ALONG
EAST FACING REEFS OF THE MARIANAS, AND A MODERATE RISK OF LIGHTNING,
THROUGH AT LEAST FRIDAY NIGHT. TINIAN AND SAIPAN WILL HAVE LARGER SURF
THAN GUAM AND ROTA TONIGHT DUE TO WINDS FROM INVEST 92W.
GUZ001-MPZ001-182130-
GUAM-ROTA-
418 PM CHST THU JUN 18 2026
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 PM THURSDAY
THROUGH 600 AM SATURDAY
TONIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............2 TO 4 FEET.
EAST FACING REEFS............4 TO 6 FEET.
SOUTH FACING REEFS............2 TO 4 FEET.
WEST FACING REEFS............1 TO 2 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 4 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............SOUTHEAST AT AROUND 2 FEET.
SECONDARY PERIOD.............10 SECONDS.
WATER TEMPERATURE
IPAN BUOY.......... 84 DEGREES.
WINDS...............EAST AT 10 TO 15 MPH.
FRIDAY
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............2 TO 4 FEET.
EAST FACING REEFS............5 TO 7 FEET.
SOUTH FACING REEFS............2 TO 4 FEET.
WEST FACING REEFS............1 TO 2 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 4 TO 5 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............SOUTHEAST AT AROUND 2 FEET.
SECONDARY PERIOD.............10 SECONDS.
MAX HEAT INDEX.........AROUND 99.
WINDS...............SOUTHEAST AT 10 TO 15 MPH.
FRIDAY NIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............2 TO 3 FEET.
EAST FACING REEFS............4 TO 5 FEET.
SOUTH FACING REEFS............2 TO 3 FEET.
WEST FACING REEFS............1 TO 2 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 2 TO 3 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............SOUTHEAST AT AROUND 2 FEET.
SECONDARY PERIOD.............10 SECONDS.
WINDS...............SOUTHEAST AT 10 TO 15 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
HIGH TIDE 2.7 FEET AT 11:44 PM THURSDAY
LOW TIDE 1.8 FEET AT 5:10 AM FRIDAY
HIGH TIDE 2.5 FEET AT 9:44 AM FRIDAY
LOW TIDE -0.1 FEET AT 5:10 PM FRIDAY
HIGH TIDE 2.7 FEET AT 12:29 AM SATURDAY
LOW TIDE 1.6 FEET AT 6:12 AM SATURDAY
AT ROTA ISLAND...
HIGH TIDE 2.5 FEET AT 11:41 PM THURSDAY
LOW TIDE 1.6 FEET AT 5:04 AM FRIDAY
HIGH TIDE 2.4 FEET AT 9:41 AM FRIDAY
LOW TIDE -0.1 FEET AT 5:04 PM FRIDAY
HIGH TIDE 2.5 FEET AT 12:26 AM SATURDAY
LOW TIDE 1.5 FEET AT 6:06 AM SATURDAY
MPZ002-003-182130-
TINIAN-SAIPAN-
418 PM CHST THU JUN 18 2026
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 PM THURSDAY
THROUGH 600 AM SATURDAY
TONIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 4 FEET.
EAST FACING REEFS............6 TO 7 FEET.
SOUTH FACING REEFS............3 TO 4 FEET.
WEST FACING REEFS............AROUND 1 FOOT.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 5 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............SOUTHEAST AT AROUND 2 FEET.
SECONDARY PERIOD.............10 SECONDS.
WATER TEMPERATURE
TANAPAG BUOY.......... 86 DEGREES.
WINDS...............EAST AT 15 TO 20 MPH.
FRIDAY
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............2 TO 3 FEET.
EAST FACING REEFS............5 TO 7 FEET.
SOUTH FACING REEFS............3 TO 4 FEET.
WEST FACING REEFS............AROUND 1 FOOT.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 4 TO 5 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............SOUTHEAST AT AROUND 2 FEET.
SECONDARY PERIOD.............10 SECONDS.
MAX HEAT INDEX.........AROUND 100.
WINDS...............SOUTHEAST AT 15 TO 20 MPH.
FRIDAY NIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............2 TO 3 FEET.
EAST FACING REEFS............4 TO 5 FEET.
SOUTH FACING REEFS............2 TO 3 FEET.
WEST FACING REEFS............AROUND 1 FOOT.
SWELL/PERIOD
PRIMARY SWELL................EAST AT AROUND 3 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............SOUTHEAST AT AROUND 2 FEET.
SECONDARY PERIOD.............10 SECONDS.
WINDS...............SOUTHEAST AT 10 TO 15 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT TINIAN ISLAND...
HIGH TIDE 2.0 FEET AT 11:42 PM THURSDAY
LOW TIDE 0.6 FEET AT 4:47 AM FRIDAY
HIGH TIDE 1.9 FEET AT 9:42 AM FRIDAY
LOW TIDE 0.0 FEET AT 4:47 PM FRIDAY
HIGH TIDE 2.0 FEET AT 12:27 AM SATURDAY
LOW TIDE 0.5 FEET AT 5:49 AM SATURDAY
AT TANAPAG HARBOR, SAIPAN...
HIGH TIDE 2.5 FEET AT 12:10 AM FRIDAY
LOW TIDE 1.6 FEET AT 5:41 AM FRIDAY
HIGH TIDE 2.0 FEET AT 9:45 AM FRIDAY
LOW TIDE -0.4 FEET AT 5:16 PM FRIDAY
HIGH TIDE 2.4 FEET AT 12:48 AM SATURDAY
LOW TIDE 1.3 FEET AT 6:44 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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