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FZPQ50 PGUM 301853
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
453 AM ChST Mon Dec 1 2025

.DISCUSSION...There will be a high risk of rip currents along north
and east facing reefs of the Marianas today, and hazardous surf along
north facing reefs. The high risk of rip currents will continue along
east facing reefs through Wednesday while diminishing to moderate
along the north reefs. There will also be a moderate risk of
lightning through tonight.

$$

GUZ001-MPZ001>003-011000-
Guam-Rota-Tinian-Saipan-
453 AM ChST Mon Dec 1 2025

...HIGH SURF ADVISORY IN EFFECT UNTIL 4 PM CHST THIS AFTERNOON ALONG
NORTH FACING REEFS...
...HIGH RISK OF RIP CURRENTS THROUGH WEDNESDAY AFTERNOON ALONG
NORTH AND EAST FACING REEFS...

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

.TODAY...
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 5 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............8 seconds.
      Secondary swell..............Northeast at 4 to 5 feet.
      Secondary period.............13 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Max Heat Index.........Around 101.
Winds...............East at 15 to 20 mph.

.TONIGHT...
Rip Current Risk.....High *.
Surf Height
      North facing reefs............6 to 8 feet.
      East  facing reefs............7 to 9 feet.
      South facing reefs............3 to 5 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............8 seconds.
      Secondary swell..............Northeast at 4 to 5 feet.
      Secondary period.............13 seconds.
Winds...............East at 10 to 20 mph.

.TUESDAY...
Rip Current Risk.....High *.
Surf Height
      North facing reefs............6 to 8 feet.
      East  facing reefs............8 to 10 feet.
      South facing reefs............3 to 5 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................East at 5 to 7 feet.
      Primary period...............8 seconds.
      Secondary swell..............Northeast at 4 to 5 feet.
      Secondary period.............13 seconds.
Max Heat Index.........Around 99.
Winds...............East at 15 to 20 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  0.7 feet at  9:43 AM Monday
High tide  2.3 feet at  4:02 PM Monday
Low  tide  0.0 feet at 11:02 PM Monday
High tide  1.9 feet at  5:37 AM Tuesday
Low  tide  1.0 feet at 10:45 AM Tuesday
High tide  2.4 feet at  4:37 PM Tuesday
Low  tide -0.5 feet at 11:46 PM Tuesday

At Rota Island...
Low  tide  0.7 feet at  9:37 AM Monday
High tide  2.2 feet at  3:59 PM Monday
Low  tide  0.0 feet at 10:56 PM Monday
High tide  1.8 feet at  5:34 AM Tuesday
Low  tide  0.9 feet at 10:39 AM Tuesday
High tide  2.2 feet at  4:34 PM Tuesday
Low  tide -0.4 feet at 11:40 PM Tuesday

At Tinian Island...
Low  tide  0.6 feet at  8:47 AM Monday
High tide  1.8 feet at  3:14 PM Monday
Low  tide  0.0 feet at 10:33 PM Monday
High tide  1.2 feet at  5:06 AM Tuesday
Low  tide  0.8 feet at  9:38 AM Tuesday
High tide  1.8 feet at  3:42 PM Tuesday
Low  tide -0.3 feet at 11:18 PM Tuesday

At Tanapag Harbor, Saipan...
Low  tide  0.8 feet at  9:50 AM Monday
High tide  2.2 feet at  4:06 PM Monday
Low  tide  0.1 feet at 11:04 PM Monday
High tide  1.9 feet at  5:53 AM Tuesday
Low  tide  1.1 feet at 10:46 AM Tuesday
High tide  2.3 feet at  4:37 PM Tuesday
Low  tide -0.3 feet at 11:46 PM Tuesday

* 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.

$$