761
FZPQ50 PGUM 161800
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
400 AM ChST Thu Jul 17 2025

.DISCUSSION...There will be a moderate risk of rip currents along
east facing reefs of the Marianas through at least the end of the
week. The west-southwest swell has been slower to develop but looks
to eventually build over the weekend, with a moderate risk of rip
currents possibly developing along south and west facing reefs.
A moderate risk of lightning is expected to continue through at
least Saturday.

$$

GUZ001-MPZ001>003-170900-
Guam-Rota-Tinian-Saipan-
400 AM ChST Thu Jul 17 2025

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............2 to 4 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...............9 seconds.
      Secondary swell..............West at around 2 feet.
      Secondary period.............7 seconds.
Water Temperature
      Ritidian buoy................86 Degrees.
Max Heat Index.....................Around 102.
Winds..............................East at 10 to 15 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 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...............9 seconds.
      Secondary swell..............West at around 2 feet.
      Secondary period.............7 seconds.
Winds..............................East at 5 to 15 mph.

.FRIDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 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...............9 seconds.
      Secondary swell..............West at around 2 feet.
      Secondary period.............7 seconds.
Max Heat Index.....................Around 100.
Winds..............................East at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  1.1 feet at  6:42 AM Thursday
High tide  2.1 feet at 12:06 PM Thursday
Low  tide  0.9 feet at  6:14 PM Thursday
High tide  2.7 feet at 12:44 AM Friday
Low  tide  0.8 feet at  7:40 AM Friday
High tide  2.1 feet at  1:41 PM Friday

At Rota Island...
Low  tide  1.0 feet at  6:36 AM Thursday
High tide  2.0 feet at 12:03 PM Thursday
Low  tide  0.8 feet at  6:08 PM Thursday
High tide  2.5 feet at 12:41 AM Friday
Low  tide  0.7 feet at  7:34 AM Friday
High tide  1.9 feet at  1:38 PM Friday

At Tinian Island...
Low  tide  0.7 feet at  6:31 AM Thursday
High tide  1.2 feet at 11:41 AM Thursday
Low  tide  0.5 feet at  5:34 PM Thursday
High tide  1.8 feet at 12:14 AM Friday
Low  tide  0.4 feet at  7:31 AM Friday
High tide  1.2 feet at  1:31 PM Friday

At Tanapag Harbor, Saipan...
Low  tide  0.8 feet at  7:03 AM Thursday
High tide  1.6 feet at 12:23 PM Thursday
Low  tide  0.6 feet at  6:17 PM Thursday
High tide  2.3 feet at 12:55 AM Friday
Low  tide  0.5 feet at  7:57 AM Friday
High tide  1.6 feet at  1:54 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.

$$