583
FZPQ50 PGUM 180655
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
455 PM CHST MON MAY 18 2026
DISCUSSION
THERE IS A HIGH RISK OF RIP CURRENTS ALONG EAST-FACING
REEFS DUE TO THE ELEVATED EASTERLY TRADE SWELL THAT IS EXPECTED TO
CONTINUE UNTIL TUESDAY AFTERNOON. A MODERATE RISK OF RIP CURRENTS
ALONG NORTH-FACING REEFS WILL CONTINUE AT LEAST THROUGH THE FIRST
HALF OF THIS WEEK.
GUZ001-MPZ001>003-182200-
GUAM-ROTA-TINIAN-SAIPAN-
455 PM CHST MON MAY 18 2026
...HIGH RISK OF RIP CURRENTS THROUGH TUESDAY AFTERNOON ALONG
EAST FACING REEFS...
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 PM MONDAY
THROUGH 600 AM WEDNESDAY
TONIGHT
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............4 TO 6 FEET.
EAST FACING REEFS............7 TO 9 FEET.
SOUTH FACING REEFS............2 TO 3 FEET.
WEST FACING REEFS............1 TO 2 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 5 TO 7 FEET.
PRIMARY PERIOD...............9 SECONDS.
WATER TEMPERATURE
TANAPAG BUOY.......... 84 DEGREES.
WINDS...............EAST AT 15 TO 20 MPH.
TUESDAY
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............4 TO 6 FEET.
EAST FACING REEFS............7 TO 9 FEET.
SOUTH FACING REEFS............2 TO 3 FEET.
WEST FACING REEFS............1 TO 2 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 5 TO 7 FEET.
PRIMARY PERIOD...............9 SECONDS.
MAX HEAT INDEX.........AROUND 98.
WINDS...............EAST AT 15 TO 20 MPH.
TUESDAY NIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............4 TO 6 FEET.
EAST FACING REEFS............6 TO 8 FEET.
SOUTH FACING REEFS............2 TO 3 FEET.
WEST FACING REEFS............1 TO 2 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 4 TO 6 FEET.
PRIMARY PERIOD...............8 SECONDS.
WINDS...............EAST AT 10 TO 20 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
HIGH TIDE 2.7 FEET AT 10:08 PM MONDAY
LOW TIDE 1.8 FEET AT 3:22 AM TUESDAY
HIGH TIDE 2.7 FEET AT 8:03 AM TUESDAY
LOW TIDE -0.7 FEET AT 3:37 PM TUESDAY
HIGH TIDE 2.7 FEET AT 11:09 PM TUESDAY
LOW TIDE 1.9 FEET AT 4:21 AM WEDNESDAY
HIGH TIDE 2.6 FEET AT 8:52 AM WEDNESDAY
AT ROTA ISLAND...
HIGH TIDE 2.5 FEET AT 10:05 PM MONDAY
LOW TIDE 1.7 FEET AT 3:16 AM TUESDAY
HIGH TIDE 2.5 FEET AT 8:00 AM TUESDAY
LOW TIDE -0.6 FEET AT 3:31 PM TUESDAY
HIGH TIDE 2.5 FEET AT 11:06 PM TUESDAY
LOW TIDE 1.8 FEET AT 4:15 AM WEDNESDAY
HIGH TIDE 2.4 FEET AT 8:49 AM WEDNESDAY
AT TINIAN ISLAND...
HIGH TIDE 2.0 FEET AT 10:06 PM MONDAY
LOW TIDE 0.6 FEET AT 2:59 AM TUESDAY
HIGH TIDE 2.0 FEET AT 8:01 AM TUESDAY
LOW TIDE -0.2 FEET AT 3:14 PM TUESDAY
HIGH TIDE 2.0 FEET AT 11:07 PM TUESDAY
LOW TIDE 0.6 FEET AT 3:58 AM WEDNESDAY
HIGH TIDE 1.9 FEET AT 8:50 AM WEDNESDAY
AT TANAPAG HARBOR, SAIPAN...
HIGH TIDE 2.5 FEET AT 10:42 PM MONDAY
LOW TIDE 1.8 FEET AT 3:35 AM TUESDAY
HIGH TIDE 2.3 FEET AT 7:44 AM TUESDAY
LOW TIDE -0.8 FEET AT 3:40 PM TUESDAY
HIGH TIDE 2.5 FEET AT 11:46 PM TUESDAY
LOW TIDE 1.9 FEET AT 4:44 AM WEDNESDAY
HIGH TIDE 2.2 FEET AT 8:34 AM WEDNESDAY
* 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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