877
FZPQ50 PGUM 201215
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
1015 PM CHST THU AUG 20 2026
DISCUSSION
THERE IS A MODERATE RISK OF RIP CURRENTS ALONG NORTH- AND WEST-
FACING REEFS. A MODERATE RISK OF RIP CURRENTS WILL DEVELOP FOR EAST
FACING REEFS FRIDAY. THIS WILL LIKELY BECOME A HIGH RISK OF RIP
CURRENTS FOR EAST FACING REEFS FRIDAY NIGHT AND SURF MAY REACH NEAR
HIGH SURF ADVISORY CRITERIA, PARTICULARILY FOR TINIAN AND SAIPAN AS
TROPICAL STORM SAUDEL MOVES CLOSER TO THE MARIANAS. A MODERATE RISK
OF LIGHTNING WILL ALSO BEGIN FRIDAY AND PERSIST THROUGH THE WEEK.
THIS SITUATION WILL CONTINUE TO BE MONITORED CLOSELY.
GUZ001-MPZ001-202000-
GUAM-ROTA-
1015 PM CHST THU AUG 20 2026
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 811 PM THURSDAY
THROUGH 600 AM SATURDAY
REST OF TONIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 5 FEET.
EAST FACING REEFS............2 TO 4 FEET.
SOUTH FACING REEFS............2 TO 4 FEET.
WEST FACING REEFS............3 TO 5 FEET.
SWELL/PERIOD
PRIMARY SWELL................NORTHEAST AT AROUND 3 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............WEST AT AROUND 3 FEET.
SECONDARY PERIOD.............8 SECONDS.
WATER TEMPERATURE
APRA HARBOR.......... 84 DEGREES.
WINDS...............NORTHEAST AT 10 MPH.
FRIDAY
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 5 FEET.
EAST FACING REEFS............5 TO 8 FEET.
SOUTH FACING REEFS............3 TO 5 FEET.
WEST FACING REEFS............3 TO 5 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHEAST AT 4 TO 6 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............WEST AT AROUND 3 FEET.
SECONDARY PERIOD.............9 SECONDS.
MAX HEAT INDEX.........AROUND 100.
WINDS...............LIGHT AND VARIABLE.
FRIDAY NIGHT
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 6 FEET.
EAST FACING REEFS............6 TO 10 FEET.
SOUTH FACING REEFS............3 TO 6 FEET.
WEST FACING REEFS............3 TO 5 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 5 TO 8 FEET.
PRIMARY PERIOD...............11 SECONDS.
SECONDARY SWELL..............SOUTH AT AROUND 3 FEET.
SECONDARY PERIOD.............8 SECONDS.
WINDS...............WEST AT 5 TO 15 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
HIGH TIDE 2.1 FEET AT 12:24 AM FRIDAY
LOW TIDE 0.4 FEET AT 8:20 AM FRIDAY
HIGH TIDE 2.0 FEET AT 4:29 PM FRIDAY
LOW TIDE 1.8 FEET AT 8:42 PM FRIDAY
HIGH TIDE 2.1 FEET AT 1:14 AM SATURDAY
LOW TIDE 0.3 FEET AT 9:21 AM SATURDAY
HIGH TIDE 2.1 FEET AT 5:34 PM SATURDAY
AT ROTA ISLAND...
HIGH TIDE 2.0 FEET AT 12:21 AM FRIDAY
LOW TIDE 0.4 FEET AT 8:14 AM FRIDAY
HIGH TIDE 1.9 FEET AT 4:26 PM FRIDAY
LOW TIDE 1.7 FEET AT 8:36 PM FRIDAY
HIGH TIDE 1.9 FEET AT 1:11 AM SATURDAY
LOW TIDE 0.3 FEET AT 9:15 AM SATURDAY
HIGH TIDE 1.9 FEET AT 5:31 PM SATURDAY
MPZ002-003-202000-
TINIAN-SAIPAN-
1015 PM CHST THU AUG 20 2026
..TROPICAL STORM WATCH REMAINS IN EFFECT
THE ISLANDS OF TINIAN AND SAIPAN ARE UNDER A TROPICAL STORM WATCH.
USERS ARE REFERRED TO THE TS SAUDEL LOCAL STATEMENT WTPQ81 PGUM HLSPQ1
FOR MORE UPDATED AND DETAILED SURF ZONE AND HAZARD INFORMATION.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT TINIAN ISLAND...
HIGH TIDE 1.6 FEET AT 12:22 AM FRIDAY
LOW TIDE 0.1 FEET AT 7:57 AM FRIDAY
HIGH TIDE 1.5 FEET AT 4:27 PM FRIDAY
LOW TIDE 0.6 FEET AT 8:19 PM FRIDAY
HIGH TIDE 1.5 FEET AT 1:12 AM SATURDAY
LOW TIDE 0.1 FEET AT 8:58 AM SATURDAY
HIGH TIDE 1.5 FEET AT 5:32 PM SATURDAY
AT TANAPAG HARBOR, SAIPAN...
HIGH TIDE 1.9 FEET AT 12:30 AM FRIDAY
LOW TIDE 0.3 FEET AT 8:41 AM FRIDAY
HIGH TIDE 1.7 FEET AT 5:25 PM FRIDAY
LOW TIDE 1.7 FEET AT 7:58 PM FRIDAY
HIGH TIDE 1.9 FEET AT 12:59 AM SATURDAY
LOW TIDE 0.2 FEET AT 9:40 AM SATURDAY
HIGH TIDE 1.8 FEET AT 6:20 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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