013
FZPQ50 PGUM 171842
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
442 AM ChST Tue Nov 18 2025

.DISCUSSION...There will be a moderate risk of rip currents along
north and east facing reefs of the Marianas through at least
Wednesday night. Then, the trade swell is expected to build for
the rest of the week. This will allow the rip current risk to
increase to high.

$$

GUZ001-MPZ001>003-180900-
Guam-Rota-Tinian-Saipan-
442 AM ChST Tue Nov 18 2025

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

.TODAY...
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................Northeast at 4 to 6 feet.
      Primary period...............8 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Max Heat Index.........Around 101.
Winds...............East at 10 to 20 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 5 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 4 to 6 feet.
      Primary period...............8 seconds.
Winds...............East at 10 to 20 mph.

.WEDNESDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............6 to 8 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................Northeast at 5 to 7 feet.
      Primary period...............8 seconds.
Max Heat Index.........Around 101.
Winds...............East at 10 to 20 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  1.9 feet at  7:13 AM Tuesday
Low  tide  1.1 feet at 12:26 PM Tuesday
High tide  2.1 feet at  5:52 PM Tuesday
Low  tide -0.2 feet at 12:58 AM Wednesday
High tide  2.0 feet at  7:55 AM Wednesday
Low  tide  1.3 feet at  1:08 PM Wednesday

At Rota Island...
High tide  1.8 feet at  7:10 AM Tuesday
Low  tide  1.1 feet at 12:20 PM Tuesday
High tide  2.0 feet at  5:49 PM Tuesday
Low  tide -0.2 feet at 12:52 AM Wednesday
High tide  1.9 feet at  7:52 AM Wednesday
Low  tide  1.2 feet at  1:02 PM Wednesday

At Tinian Island...
High tide  1.3 feet at  6:54 AM Tuesday
Low  tide  1.0 feet at 11:18 AM Tuesday
High tide  1.6 feet at  4:54 PM Tuesday
Low  tide -0.1 feet at 12:34 AM Wednesday
High tide  1.4 feet at  7:52 AM Wednesday
Low  tide  1.2 feet at 11:59 AM Wednesday

At Tanapag Harbor, Saipan...
High tide  1.9 feet at  7:29 AM Tuesday
Low  tide  1.3 feet at 12:14 PM Tuesday
High tide  2.1 feet at  5:53 PM Tuesday
Low  tide  0.0 feet at  1:00 AM Wednesday
High tide  2.0 feet at  8:13 AM Wednesday
Low  tide  1.5 feet at 12:55 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.

$$