519
FZPQ50 PGUM 081758
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
358 AM ChST Tue Dec 9 2025

.DISCUSSION...A moderate risk of rip currents is expected along north
and east facing reefs of the Marianas for at least the next few days
due to the mixture of a seasonal trade well and background north
swell. High surf of 9 feet and high risk of rip currents are possible
once again along north facing reefs later this week as a shear line
continues to descend toward the Marianas.

$$

GUZ001-MPZ001>003-090900-
Guam-Rota-Tinian-Saipan-
358 AM ChST Tue Dec 9 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............6 to 8 feet.
      East  facing reefs............6 to 8 feet.
      South facing reefs............1 to 2 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 3 to 4 feet.
      Secondary period.............10 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Max Heat Index.........Around 98.
Winds...............East at 10 to 15 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 7 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 4 to 5 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at around 3 feet.
      Secondary period.............9 seconds.
Winds...............East at 10 to 15 mph.

.WEDNESDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 7 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 4 to 5 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at around 3 feet.
      Secondary period.............9 seconds.
Max Heat Index.........Around 99.
Winds...............Breezy. East at 15 to 25 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide -0.8 feet at  4:38 AM Tuesday
High tide  2.2 feet at 12:16 PM Tuesday
Low  tide  1.4 feet at  5:35 PM Tuesday
High tide  2.0 feet at  9:52 PM Tuesday
Low  tide -0.5 feet at  5:29 AM Wednesday
High tide  2.1 feet at  1:07 PM Wednesday
Low  tide  1.3 feet at  6:46 PM Wednesday

At Rota Island...
Low  tide -0.8 feet at  4:32 AM Tuesday
High tide  2.0 feet at 12:13 PM Tuesday
Low  tide  1.3 feet at  5:29 PM Tuesday
High tide  1.9 feet at  9:49 PM Tuesday
Low  tide -0.5 feet at  5:23 AM Wednesday
High tide  2.0 feet at  1:04 PM Wednesday
Low  tide  1.2 feet at  6:40 PM Wednesday

At Tinian Island...
Low  tide -0.3 feet at  4:15 AM Tuesday
High tide  1.6 feet at 12:14 PM Tuesday
Low  tide  0.5 feet at  5:12 PM Tuesday
High tide  1.5 feet at  9:50 PM Tuesday
Low  tide -0.2 feet at  5:06 AM Wednesday
High tide  1.6 feet at  1:05 PM Wednesday
Low  tide  0.4 feet at  6:23 PM Wednesday

At Tanapag Harbor, Saipan...
Low  tide -0.5 feet at  4:42 AM Tuesday
High tide  2.4 feet at 12:34 PM Tuesday
Low  tide  1.6 feet at  6:03 PM Tuesday
High tide  1.9 feet at  9:52 PM Tuesday
Low  tide -0.2 feet at  5:36 AM Wednesday
High tide  2.3 feet at  1:18 PM Wednesday
Low  tide  1.4 feet at  7:17 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.

$$