486
FZPQ50 PGUM 211818
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
418 AM CHST SAT AUG 22 2026
DISCUSSION
THERE WILL BE A HIGH RISK OF RIP CURRENTS ALONG EAST
FACING REEFS OF THE MARIANAS, AND ALONG NORTH FACING REEFS OF TINIAN
AND SAIPAN. THERE WILL ALSO BE A MODERATE RISK OF LIGHTNING THROUGH
ALL OF NEXT WEEK AS A MONSOON SURGE BRINGS SCATTERED SHOWERS AND
ISOLATED THUNDERSTORMS.
GUZ001-MPZ001-220930-
GUAM-ROTA-
418 AM CHST SAT AUG 22 2026
...HIGH RISK OF RIP CURRENTS THROUGH SUNDAY AFTERNOON ALONG NORTH AND
EAST FACING REEFS...
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 AM SATURDAY
THROUGH 600 PM SUNDAY
TODAY
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............4 TO 6 FEET.
EAST FACING REEFS............7 TO 9 FEET.
SOUTH FACING REEFS............4 TO 6 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHWEST AT 2 TO 4 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............EAST AT 4 TO 6 FEET.
SECONDARY PERIOD.............8 SECONDS.
WATER TEMPERATURE
REAL TIME OCEAN FORECAST SYSTEM...86 DEGREES.
MAX HEAT INDEX.........AROUND 103.
WINDS...............SOUTHWEST AT 10 TO 20 MPH.
TONIGHT
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............4 TO 6 FEET.
EAST FACING REEFS............7 TO 9 FEET.
SOUTH FACING REEFS............4 TO 6 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHWEST AT 4 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............EAST AT 5 TO 6 FEET.
SECONDARY PERIOD.............9 SECONDS.
WINDS...............SOUTHWEST AT 15 TO 20 MPH.
SUNDAY
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............4 TO 6 FEET.
EAST FACING REEFS............6 TO 9 FEET.
SOUTH FACING REEFS............4 TO 6 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHWEST AT 3 TO 4 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............SOUTHEAST AT 4 TO 6 FEET.
SECONDARY PERIOD.............9 SECONDS.
MAX HEAT INDEX.........AROUND 102.
WINDS...............SOUTHWEST AT 15 TO 20 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
LOW TIDE 0.3 FEET AT 9:21 AM SATURDAY
HIGH TIDE 2.1 FEET AT 5:34 PM SATURDAY
LOW TIDE 1.8 FEET AT 10:11 PM SATURDAY
HIGH TIDE 2.0 FEET AT 2:22 AM SUNDAY
LOW TIDE 0.3 FEET AT 10:21 AM SUNDAY
HIGH TIDE 2.1 FEET AT 6:18 PM SUNDAY
LOW TIDE 1.7 FEET AT 11:12 PM SUNDAY
AT ROTA ISLAND...
LOW TIDE 0.3 FEET AT 9:15 AM SATURDAY
HIGH TIDE 1.9 FEET AT 5:31 PM SATURDAY
LOW TIDE 1.7 FEET AT 10:05 PM SATURDAY
HIGH TIDE 1.9 FEET AT 2:19 AM SUNDAY
LOW TIDE 0.2 FEET AT 10:15 AM SUNDAY
HIGH TIDE 2.0 FEET AT 6:15 PM SUNDAY
LOW TIDE 1.6 FEET AT 11:06 PM SUNDAY
MPZ002-003-220930-
TINIAN-SAIPAN-
418 AM CHST SAT AUG 22 2026
...HIGH SURF ADVISORY IN EFFECT UNTIL 5 PM CHST SUNDAY ALONG NORTH
FACING REEFS...
...HIGH RISK OF RIP CURRENTS THROUGH SUNDAY AFTERNOON ALONG NORTH AND
EAST FACING REEFS...
..TROPICAL STORM WATCH IN EFFECT
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 AM SATURDAY
THROUGH 600 PM SUNDAY
TODAY
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............7 TO 10 FEET.
EAST FACING REEFS............7 TO 10 FEET.
SOUTH FACING REEFS............4 TO 6 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHWEST AT 2 TO 4 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............NORTHEAST AT 4 TO 7 FEET.
SECONDARY PERIOD.............9 SECONDS.
WATER TEMPERATURE
REAL TIME OCEAN FORECAST SYSTEM...86 DEGREES.
MAX HEAT INDEX.........AROUND 102.
WINDS...............WEST AT 15 TO 20 MPH.
TONIGHT
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............7 TO 10 FEET.
EAST FACING REEFS............7 TO 10 FEET.
SOUTH FACING REEFS............4 TO 6 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHWEST AT 2 TO 5 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............NORTHEAST AT 5 TO 7 FEET.
SECONDARY PERIOD.............9 SECONDS.
WINDS...............SOUTHWEST AT 15 TO 20 MPH.
SUNDAY
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............6 TO 8 FEET.
EAST FACING REEFS............6 TO 8 FEET.
SOUTH FACING REEFS............7 TO 9 FEET.
WEST FACING REEFS............7 TO 9 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHWEST AT AROUND 4 FEET.
PRIMARY PERIOD...............9 SECONDS.
SECONDARY SWELL..............SOUTHWEST AT 4 TO 7 FEET.
SECONDARY PERIOD.............9 SECONDS.
MAX HEAT INDEX.........AROUND 102.
WINDS...............SOUTHWEST AT 15 TO 20 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT TINIAN ISLAND...
LOW TIDE 0.1 FEET AT 8:58 AM SATURDAY
HIGH TIDE 1.5 FEET AT 5:32 PM SATURDAY
LOW TIDE 0.6 FEET AT 9:48 PM SATURDAY
HIGH TIDE 1.5 FEET AT 2:20 AM SUNDAY
LOW TIDE 0.1 FEET AT 9:58 AM SUNDAY
HIGH TIDE 1.6 FEET AT 6:16 PM SUNDAY
LOW TIDE 0.6 FEET AT 10:49 PM SUNDAY
AT TANAPAG HARBOR, SAIPAN...
LOW TIDE 0.2 FEET AT 9:40 AM SATURDAY
HIGH TIDE 1.8 FEET AT 6:20 PM SATURDAY
LOW TIDE 1.7 FEET AT 9:38 PM SATURDAY
HIGH TIDE 1.9 FEET AT 1:43 AM SUNDAY
LOW TIDE 0.1 FEET AT 10:33 AM SUNDAY
HIGH TIDE 1.9 FEET AT 6:54 PM SUNDAY
LOW TIDE 1.7 FEET AT 10:40 PM SUNDAY
* 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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