117
FZPQ50 PGUM 181800
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
400 AM CHST SAT JUL 19 2025
DISCUSSION
THERE IS A MODERATE RISK OF RIP CURRENTS ALONG EAST
FACING REEFS OF THE MARIANAS THROUGH AT LEAST THE WEEKEND.
WEST-SOUTHWEST SWELL MAY BUILD STARTING TONIGHT, POTENTIALLY
INCREASING SURF ENOUGH TO PRODUCE A MODERATE RISK OF RIP CURRENTS
ALONG SOUTH AND WEST FACING REEFS NEXT WEEK. A MODERATE RISK
OF LIGHTNING IS EXPECTED THROUGH THE WEEKEND.
GUZ001-MPZ001>003-190900-
GUAM-ROTA-TINIAN-SAIPAN-
400 AM CHST SAT JUL 19 2025
36 HOUR SURF ZONE FORECAST FOR THE MARIANAS FROM 600 AM SATURDAY
THROUGH 600 PM SUNDAY
TODAY
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 4 FEET.
EAST FACING REEFS............5 TO 7 FEET.
SOUTH FACING REEFS............1 TO 3 FEET.
WEST FACING REEFS............1 TO 2 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 3 TO 5 FEET.
PRIMARY PERIOD...............8 SECONDS.
WATER TEMPERATURE
RITIDIAN BUOY..........86 DEGREES.
MAX HEAT INDEX.........AROUND 100.
WINDS...............EAST AT 10 TO 15 MPH. GUSTS TO 25 MPH
NEAR SHOWERS.
TONIGHT
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............3 TO 4 FEET.
EAST FACING REEFS............5 TO 7 FEET.
SOUTH FACING REEFS............2 TO 3 FEET.
WEST FACING REEFS............1 TO 3 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 3 TO 5 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............WEST AT 1 TO 2 FEET.
SECONDARY PERIOD.............8 SECONDS.
WINDS...............EAST AT 10 TO 15 MPH.
SUNDAY
RIP CURRENT RISK.....MODERATE *.
SURF HEIGHT
NORTH FACING REEFS............2 TO 4 FEET.
EAST FACING REEFS............4 TO 6 FEET.
SOUTH FACING REEFS............2 TO 3 FEET.
WEST FACING REEFS............2 TO 3 FEET.
SWELL/PERIOD
PRIMARY SWELL................EAST AT 3 TO 4 FEET.
PRIMARY PERIOD...............8 SECONDS.
SECONDARY SWELL..............WEST AT 1 TO 2 FEET.
SECONDARY PERIOD.............9 SECONDS.
MAX HEAT INDEX.........AROUND 103.
WINDS...............SOUTHEAST AT 10 TO 15 MPH.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
LOW TIDE 0.4 FEET AT 8:40 AM SATURDAY
HIGH TIDE 2.1 FEET AT 3:29 PM SATURDAY
LOW TIDE 1.6 FEET AT 8:09 PM SATURDAY
HIGH TIDE 2.7 FEET AT 2:01 AM SUNDAY
LOW TIDE 0.1 FEET AT 9:41 AM SUNDAY
HIGH TIDE 2.2 FEET AT 5:09 PM SUNDAY
LOW TIDE 1.8 FEET AT 9:24 PM SUNDAY
AT ROTA ISLAND...
LOW TIDE 0.4 FEET AT 8:34 AM SATURDAY
HIGH TIDE 2.0 FEET AT 3:26 PM SATURDAY
LOW TIDE 1.5 FEET AT 8:03 PM SATURDAY
HIGH TIDE 2.5 FEET AT 1:58 AM SUNDAY
LOW TIDE 0.1 FEET AT 9:35 AM SUNDAY
HIGH TIDE 2.1 FEET AT 5:06 PM SUNDAY
LOW TIDE 1.7 FEET AT 9:18 PM SUNDAY
AT TINIAN ISLAND...
LOW TIDE 0.1 FEET AT 8:30 AM SATURDAY
HIGH TIDE 1.2 FEET AT 3:29 PM SATURDAY
LOW TIDE 1.1 FEET AT 7:12 PM SATURDAY
HIGH TIDE 1.9 FEET AT 1:20 AM SUNDAY
LOW TIDE -0.2 FEET AT 9:26 AM SUNDAY
HIGH TIDE 1.4 FEET AT 5:14 PM SUNDAY
LOW TIDE 1.3 FEET AT 8:20 PM SUNDAY
AT TANAPAG HARBOR, SAIPAN...
LOW TIDE 0.1 FEET AT 8:54 AM SATURDAY
HIGH TIDE 1.6 FEET AT 3:54 PM SATURDAY
LOW TIDE 1.3 FEET AT 8:00 PM SATURDAY
HIGH TIDE 2.3 FEET AT 1:53 AM SUNDAY
LOW TIDE -0.2 FEET AT 9:51 AM SUNDAY
HIGH TIDE 1.8 FEET AT 5:35 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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