163
FZPQ50 PGUM 290706
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
506 PM ChST Sat Nov 29 2025

.DISCUSSION...There will be a moderate risk of rip currents along
north and east facing reefs of the Marianas through tonight. Then,
the arrival of long-period north-northeast swell will increase surf
along north and east facing reefs over the next few days. The rip
risk increases to high along east facing reefs first, then surf along
north-facing reefs may increase to the high rip risk and high surf
thresholds (9 foot surf along north facing reefs) Sunday night and
Monday. There will also be a moderate risk of lightning through
Monday for Tinian and Saipan and through Tuesday for Guam and Rota.

$$

GUZ001-MPZ001>003-292300-
Guam-Rota-Tinian-Saipan-
506 PM ChST Sat Nov 29 2025

...HIGH RISK OF RIP CURRENTS FROM SUNDAY MORNING THROUGH
WEDNESDAY AFTERNOON ALONG EAST FACING REEFS...

36 hour Surf Zone Forecast for the Marianas from 600 PM Saturday
through 600 AM Monday

.TONIGHT...
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 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at around 2 feet.
      Secondary period.............12 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Winds...............East at 10 to 20 mph.

.SUNDAY...
Rip Current Risk.....High *.
Surf Height
      North facing reefs............5 to 8 feet.
      East  facing reefs............7 to 9 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at around 4 feet.
      Secondary period.............12 seconds.
Max Heat Index.........Around 101.
Winds...............Breezy. East at 15 to 25 mph.

.SUNDAY NIGHT...
Rip Current Risk.....High. Pounding surf will produce life
                     threatening rip currents at reefs and beaches.
Surf Height
      North facing reefs............7 to 9 feet.
      East  facing reefs............7 to 9 feet.
      South facing reefs............3 to 4 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............10 seconds.
      Secondary swell..............North at around 5 feet.
      Secondary period.............14 seconds.
Winds...............East at 10 to 20 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  0.9 feet at  9:34 PM Saturday
High tide  1.5 feet at  2:35 AM Sunday
Low  tide  0.4 feet at  8:41 AM Sunday
High tide  2.3 feet at  3:29 PM Sunday
Low  tide  0.5 feet at 10:19 PM Sunday
High tide  1.7 feet at  4:15 AM Monday

At Rota Island...
Low  tide  0.8 feet at  9:28 PM Saturday
High tide  1.4 feet at  2:32 AM Sunday
Low  tide  0.4 feet at  8:35 AM Sunday
High tide  2.1 feet at  3:26 PM Sunday
Low  tide  0.4 feet at 10:13 PM Sunday
High tide  1.6 feet at  4:12 AM Monday

At Tinian Island...
Low  tide  0.7 feet at  9:08 PM Saturday
High tide  1.1 feet at  1:46 AM Sunday
Low  tide  0.3 feet at  7:58 AM Sunday
High tide  1.7 feet at  2:50 PM Sunday
Low  tide  0.4 feet at  9:50 PM Sunday
High tide  1.1 feet at  3:31 AM Monday

At Tanapag Harbor, Saipan...
Low  tide  1.0 feet at  9:48 PM Saturday
High tide  1.5 feet at  2:44 AM Sunday
Low  tide  0.6 feet at  8:50 AM Sunday
High tide  2.2 feet at  3:37 PM Sunday
Low  tide  0.6 feet at 10:26 PM Sunday
High tide  1.6 feet at  4:36 AM Monday

* 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.

$$