143
FZPQ50 PGUM 170613
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
413 PM CHST FRI APR 17 2026
DISCUSSION
THERE WILL BE DEADLY RIP CURRENTS ALONG SOUTH, WEST AND
NORTH FACING REEFS OF GUAM AND ROTA TONIGHT AND FOR TINIAN AND SAIPAN
THROUGH SATURDAY. SURF WILL THEN SUBSIDE A BIT, THOUGH THE RIP
CURRENTS LOOK TO REMAIN HIGH, WITH LIFE THREATENING RIP CURRENTS OVER
THE WEEKEND. SURF AND RIP CURRENTS WILL DECREASE TO MODERATE BY
SUNDAY AFTERNOON. COASTAL FLOODING WILL CONTINUE AT TINIAN AND SAIPAN
THROUGH SUNDAY MORNING AND AT GUAM AND ROTA THROUGH SATURDAY
AFTERNOON.
GUZ001-MPZ001-172100-
GUAM-ROTA-
413 PM CHST FRI APR 17 2026
...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 10 AM CHST SATURDAY
ALONG SOUTH, WEST, AND NORTH FACING REEFS...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH SUNDAY AFTERNOON
ALONG SOUTH, WEST, AND NORTH FACING REEFS...
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 5 PM CHST SATURDAY
SOUTH, WEST, AND NORTH FACING SHORELINES...
...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 10 AM SATURDAY TO 5 PM
CHST SUNDAY ALONG SOUTH, WEST, AND NORTH FACING REEFS...
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 PM FRIDAY
THROUGH 600 AM SUNDAY
TONIGHT
RIP CURRENT RISK.....HIGH. HUGE WAVES WILL PRODUCE DEADLY RIP
CURRENTS. STAY OUT OF THE WATER.
SURF HEIGHT
NORTH FACING REEFS............16 TO 20 FEET.
EAST FACING REEFS............5 TO 7 FEET.
SOUTH FACING REEFS............12 TO 16 FEET.
WEST FACING REEFS............16 TO 20 FEET.
SWELL/PERIOD
PRIMARY SWELL................NORTHWEST AT 15 TO 18 FEET.
PRIMARY PERIOD...............12 SECONDS.
SECONDARY SWELL..............SOUTHWEST AT AROUND 8 FEET.
SECONDARY PERIOD.............9 SECONDS.
WATER TEMPERATURE
IPAN BUOY..........81 DEGREES.
WINDS...............WEST AT 10 TO 20 MPH.
SATURDAY
RIP CURRENT RISK.....HIGH. POUNDING SURF WILL PRODUCE LIFE
THREATENING RIP CURRENTS AT REEFS AND BEACHES.
SURF HEIGHT
NORTH FACING REEFS............14 TO 18 FEET.
EAST FACING REEFS............6 TO 8 FEET.
SOUTH FACING REEFS............11 TO 13 FEET.
WEST FACING REEFS............14 TO 18 FEET.
SWELL/PERIOD
PRIMARY SWELL................NORTHWEST AT 11 TO 16 FEET.
PRIMARY PERIOD...............11 SECONDS.
SECONDARY SWELL..............SOUTHWEST AT AROUND 6 FEET.
SECONDARY PERIOD.............8 SECONDS.
MAX HEAT INDEX.........AROUND 97.
WINDS...............SOUTHWEST AT 10 TO 15 MPH.
SATURDAY NIGHT
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............9 TO 12 FEET.
EAST FACING REEFS............3 TO 5 FEET.
SOUTH FACING REEFS............7 TO 9 FEET.
WEST FACING REEFS............8 TO 10 FEET.
SWELL/PERIOD
PRIMARY SWELL................NORTH AT 5 TO 8 FEET.
PRIMARY PERIOD...............11 SECONDS.
SECONDARY SWELL..............SOUTHWEST AT AROUND 4 FEET.
SECONDARY PERIOD.............9 SECONDS.
WINDS...............WEST AT AROUND 10 MPH IN THE EVENING
BECOMING LIGHT.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
HIGH TIDE 2.5 FEET AT 8:04 PM FRIDAY
LOW TIDE 1.0 FEET AT 1:51 AM SATURDAY
HIGH TIDE 2.5 FEET AT 7:24 AM SATURDAY
LOW TIDE -0.2 FEET AT 2:14 PM SATURDAY
HIGH TIDE 2.6 FEET AT 9:00 PM SATURDAY
LOW TIDE 1.3 FEET AT 2:39 AM SUNDAY
AT ROTA ISLAND...
HIGH TIDE 2.4 FEET AT 8:01 PM FRIDAY
LOW TIDE 1.0 FEET AT 1:45 AM SATURDAY
HIGH TIDE 2.4 FEET AT 7:21 AM SATURDAY
LOW TIDE -0.2 FEET AT 2:08 PM SATURDAY
HIGH TIDE 2.4 FEET AT 8:57 PM SATURDAY
LOW TIDE 1.2 FEET AT 2:33 AM SUNDAY
MPZ002-003-172100-
TINIAN-SAIPAN-
413 PM CHST FRI APR 17 2026
...COASTAL FLOOD WARNING REMAINS IN EFFECT UNTIL 5 AM CHST SATURDAY
ALONG SOUTH, WEST, AND NORTH FACING SHORELINES...
...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 10 AM CHST SATURDAY
ALONG SOUTH, WEST, AND NORTH FACING REEFS...
...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH SUNDAY AFTERNOON
ALONG SOUTH, WEST, AND NORTH FACING REEFS...
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT FROM 5 AM SATURDAY TO 11
AM CHST SUNDAY ALONG SOUTH, WEST, AND NORTH FACING SHORELINES...
...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 10 AM SATURDAY TO 5 PM
CHST SUNDAY ALONG SOUTH, WEST, AND NORTH FACING REEFS...
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 PM FRIDAY
THROUGH 600 AM SUNDAY
TONIGHT
RIP CURRENT RISK.....HIGH. POUNDING SURF WILL PRODUCE LIFE
THREATENING RIP CURRENTS AT REEFS AND BEACHES.
SURF HEIGHT
NORTH FACING REEFS............17 TO 23 FEET.
EAST FACING REEFS............5 TO 7 FEET.
SOUTH FACING REEFS............12 TO 17 FEET.
WEST FACING REEFS............16 TO 20 FEET.
SWELL/PERIOD
PRIMARY SWELL................NORTHWEST AT 17 TO 21 FEET.
PRIMARY PERIOD...............11 SECONDS.
SECONDARY SWELL..............SOUTHWEST AT AROUND 8 FEET.
SECONDARY PERIOD.............9 SECONDS.
WATER TEMPERATURE
IPAN BUOY..........80 DEGREES.
WINDS...............BREEZY. SOUTHWEST AT 15 TO 25 MPH.
SATURDAY
RIP CURRENT RISK.....HIGH. POUNDING SURF WILL PRODUCE LIFE
THREATENING RIP CURRENTS AT REEFS AND BEACHES.
SURF HEIGHT
NORTH FACING REEFS............14 TO 17 FEET.
EAST FACING REEFS............3 TO 5 FEET.
SOUTH FACING REEFS............11 TO 15 FEET.
WEST FACING REEFS............13 TO 17 FEET.
SWELL/PERIOD
PRIMARY SWELL................NORTHWEST AT 11 TO 15 FEET.
PRIMARY PERIOD...............11 SECONDS.
SECONDARY SWELL..............SOUTHWEST AT AROUND 6 FEET.
SECONDARY PERIOD.............8 SECONDS.
MAX HEAT INDEX.........AROUND 98.
WINDS...............SOUTHWEST AT 15 TO 20 MPH.
SATURDAY NIGHT
RIP CURRENT RISK.....HIGH *.
SURF HEIGHT
NORTH FACING REEFS............9 TO 12 FEET.
EAST FACING REEFS............4 TO 6 FEET.
SOUTH FACING REEFS............8 TO 10 FEET.
WEST FACING REEFS............9 TO 12 FEET.
SWELL/PERIOD
PRIMARY SWELL................NORTHWEST AT 7 TO 9 FEET.
PRIMARY PERIOD...............12 SECONDS.
SECONDARY SWELL..............SOUTHWEST AT AROUND 4 FEET.
SECONDARY PERIOD.............9 SECONDS.
WINDS...............SOUTHWEST AT 10 TO 15 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT TINIAN ISLAND...
HIGH TIDE 1.9 FEET AT 8:02 PM FRIDAY
LOW TIDE 0.3 FEET AT 1:28 AM SATURDAY
HIGH TIDE 1.9 FEET AT 7:22 AM SATURDAY
LOW TIDE -0.1 FEET AT 1:51 PM SATURDAY
HIGH TIDE 1.9 FEET AT 8:58 PM SATURDAY
LOW TIDE 0.4 FEET AT 2:16 AM SUNDAY
AT TANAPAG HARBOR, SAIPAN...
HIGH TIDE 2.2 FEET AT 8:21 PM FRIDAY
LOW TIDE 1.0 FEET AT 1:51 AM SATURDAY
HIGH TIDE 2.2 FEET AT 7:19 AM SATURDAY
LOW TIDE -0.3 FEET AT 2:17 PM SATURDAY
HIGH TIDE 2.3 FEET AT 9:22 PM SATURDAY
LOW TIDE 1.3 FEET AT 2:42 AM 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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