258
FZPQ50 PGUM 201811
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
411 AM CHST TUE JUL 21 2026
DISCUSSION
A LOW RISK OF RIP CURRENTS WILL CONTINUE ALONG ALL REEFS BEFORE WEST
AND SOUTH FACING REEFS POTENTIALLY BECOME MODERATE TONIGHT AS THE
SOUTHWEST MONSOON SWELL STRENGTHENS. A MODERATE RISK OF LIGHTNING IS
EXPECTED TONIGHT AND MAY CONTINUE THROUGH THE WEEKEND.
GUZ001-MPZ001>003-210800-
GUAM-ROTA-TINIAN-SAIPAN-
411 AM CHST TUE JUL 21 2026
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 AM TUESDAY
THROUGH 600 PM WEDNESDAY
TODAY
RIP CURRENT RISK.....LOW *.
SURF HEIGHT
NORTH FACING REEFS............2 TO 3 FEET.
EAST FACING REEFS............2 TO 4 FEET.
SOUTH FACING REEFS............2 TO 4 FEET.
WEST FACING REEFS............3 TO 4 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHWEST AT AROUND 3 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............EAST AT AROUND 2 FEET.
SECONDARY PERIOD.............9 SECONDS.
WATER TEMPERATURE
TANAPAG BUOY..........85 DEGREES.
MAX HEAT INDEX.........AROUND 101.
WINDS...............EAST AT 10 TO 15 MPH.
TONIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............2 TO 4 FEET.
EAST FACING REEFS............2 TO 4 FEET.
SOUTH FACING REEFS............3 TO 5 FEET.
WEST FACING REEFS............3 TO 5 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHWEST AT AROUND 4 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............EAST AT AROUND 2 FEET.
SECONDARY PERIOD.............9 SECONDS.
WINDS...............SOUTHEAST AT 10 TO 15 MPH IN THE EVENING
BECOMING LIGHT.
WEDNESDAY
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............2 TO 4 FEET.
EAST FACING REEFS............2 TO 4 FEET.
SOUTH FACING REEFS............4 TO 6 FEET.
WEST FACING REEFS............4 TO 6 FEET.
SWELL/PERIOD
PRIMARY SWELL................SOUTHWEST AT AROUND 5 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............EAST AT AROUND 2 FEET.
SECONDARY PERIOD.............9 SECONDS.
MAX HEAT INDEX.........AROUND 102.
WINDS...............SOUTH AT AROUND 10 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
LOW TIDE 0.9 FEET AT 7:29 AM TUESDAY
HIGH TIDE 1.9 FEET AT 1:30 PM TUESDAY
LOW TIDE 1.3 FEET AT 6:50 PM TUESDAY
HIGH TIDE 2.5 FEET AT 1:05 AM WEDNESDAY
LOW TIDE 0.7 FEET AT 8:25 AM WEDNESDAY
HIGH TIDE 1.9 FEET AT 3:16 PM WEDNESDAY
AT ROTA ISLAND...
LOW TIDE 0.8 FEET AT 7:23 AM TUESDAY
HIGH TIDE 1.8 FEET AT 1:27 PM TUESDAY
LOW TIDE 1.2 FEET AT 6:44 PM TUESDAY
HIGH TIDE 2.3 FEET AT 1:02 AM WEDNESDAY
LOW TIDE 0.6 FEET AT 8:19 AM WEDNESDAY
HIGH TIDE 1.8 FEET AT 3:13 PM WEDNESDAY
AT TINIAN ISLAND...
LOW TIDE 0.3 FEET AT 7:06 AM TUESDAY
HIGH TIDE 1.4 FEET AT 1:28 PM TUESDAY
LOW TIDE 0.4 FEET AT 6:27 PM TUESDAY
HIGH TIDE 1.8 FEET AT 1:03 AM WEDNESDAY
LOW TIDE 0.2 FEET AT 8:02 AM WEDNESDAY
HIGH TIDE 1.4 FEET AT 3:14 PM WEDNESDAY
AT TANAPAG HARBOR, SAIPAN...
LOW TIDE 0.6 FEET AT 7:50 AM TUESDAY
HIGH TIDE 1.5 FEET AT 1:45 PM TUESDAY
LOW TIDE 1.0 FEET AT 6:51 PM TUESDAY
HIGH TIDE 2.1 FEET AT 1:16 AM WEDNESDAY
LOW TIDE 0.4 FEET AT 8:45 AM WEDNESDAY
HIGH TIDE 1.5 FEET AT 3:43 PM 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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