898
FZPQ50 PGUM 031817
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
417 AM ChST Thu Dec 4 2025

.DISCUSSION...
Surf along north and east facing reefs have dropped below 9 feet and
allowed the high risk of rip currents to drop to moderate, while
there is a low risk of rip currents along south and west facing reefs.
Looking towards the weekend, another pulse of northerly swell,
generated by a system pushing off of Japan, is expected to enter the
region that will build surf along north facing reefs once again.
There will be a moderate risk of lightning for Guam and Rota tonight
and Friday as a weak trough passes near the Marianas.

$$

GUZ001-MPZ001>003-040930-
Guam-Rota-Tinian-Saipan-
417 AM ChST Thu Dec 4 2025

...HIGH SURF ADVISORY HAS EXPIRED...
...HIGH RISK OF RIP CURRENTS HAS EXPIRED...

36 hour Surf Zone Forecast for the Marianas from 600 AM Thursday
through 600 PM Friday

.TODAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 7 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...............8 seconds.
      Secondary swell..............Northeast at around 3 feet.
      Secondary period.............12 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Max Heat Index.........Around 99.
Winds...............East at 10 to 15 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 3 to 5 feet.
      Primary period...............8 seconds.
      Secondary swell..............Northeast at around 3 feet.
      Secondary period.............11 seconds.
Winds...............East at 10 to 15 mph.

.FRIDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 3 to 5 feet.
      Primary period...............8 seconds.
      Secondary swell..............Northeast at around 3 feet.
      Secondary period.............11 seconds.
Max Heat Index.........Around 97.
Winds...............East at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.3 feet at  7:42 AM Thursday
Low  tide  1.3 feet at 12:44 PM Thursday
High tide  2.4 feet at  5:55 PM Thursday
Low  tide -1.1 feet at  1:17 AM Friday
High tide  2.4 feet at  8:36 AM Friday
Low  tide  1.5 feet at  1:40 PM Friday
High tide  2.5 feet at  6:37 PM Friday

At Rota Island...
High tide  2.1 feet at  7:39 AM Thursday
Low  tide  1.3 feet at 12:38 PM Thursday
High tide  2.3 feet at  5:52 PM Thursday
Low  tide -1.0 feet at  1:11 AM Friday
High tide  2.2 feet at  8:33 AM Friday
Low  tide  1.4 feet at  1:34 PM Friday
High tide  2.3 feet at  6:34 PM Friday

At Tinian Island...
High tide  1.5 feet at  7:36 AM Thursday
Low  tide  1.3 feet at 11:26 AM Thursday
High tide  2.0 feet at  4:54 PM Thursday
Low  tide -0.7 feet at 12:54 AM Friday
High tide  1.7 feet at  8:41 AM Friday
Low  tide  1.4 feet at 12:27 PM Friday
High tide  2.0 feet at  5:37 PM Friday

At Tanapag Harbor, Saipan...
High tide  2.3 feet at  8:01 AM Thursday
Low  tide  1.6 feet at 12:41 PM Thursday
High tide  2.4 feet at  5:46 PM Thursday
Low  tide -0.8 feet at  1:20 AM Friday
High tide  2.4 feet at  8:57 AM Friday
Low  tide  1.7 feet at  1:46 PM Friday
High tide  2.4 feet at  6:26 PM Friday

* 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.

$$