040
FZPQ50 PGUM 181902
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
502 AM ChST Tue Aug 19 2025

.DISCUSSION...There will be a moderate risk of rip currents along
east facing reefs of the Marianas through at least Thursday. Swell
will begin to subside after today, allowing the risk of rip currents
to become low along all reefs by the end of the week. There will be
a moderate risk of lightning  through at least Thursday.

$$

GUZ001-MPZ001>003-191015-
Guam-Rota-Tinian-Saipan-
502 AM ChST Tue Aug 19 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............2 to 4 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............1 to 2 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Max Heat Index.........Around 102.
Winds...............Southeast at 10 to 20 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 7 feet.
      East  facing reefs............6 to 8 feet.
      South facing reefs............5 to 7 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at 3 to 5 feet.
      Primary period...............8 seconds.
Winds...............Southeast at around 10 mph.

.WEDNESDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 5 feet.
      East  facing reefs............4 to 6 feet.
      South facing reefs............4 to 6 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at 3 to 4 feet.
      Primary period...............8 seconds.
Max Heat Index.........Around 102.
Winds...............East at around 10 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide -0.2 feet at 10:28 AM Tuesday
High tide  2.4 feet at  6:19 PM Tuesday
Low  tide  1.9 feet at 11:04 PM Tuesday
High tide  2.4 feet at  3:44 AM Wednesday
Low  tide -0.2 feet at 11:30 AM Wednesday
High tide  2.4 feet at  7:04 PM Wednesday
Low  tide  1.7 feet at 12:06 AM Thursday

At Rota Island...
Low  tide -0.2 feet at 10:22 AM Tuesday
High tide  2.2 feet at  6:16 PM Tuesday
Low  tide  1.7 feet at 10:58 PM Tuesday
High tide  2.3 feet at  3:41 AM Wednesday
Low  tide -0.2 feet at 11:24 AM Wednesday
High tide  2.3 feet at  7:01 PM Wednesday
Low  tide  1.6 feet at 12:00 AM Thursday

At Tinian Island...
Low  tide -0.4 feet at 10:06 AM Tuesday
High tide  1.6 feet at  6:14 PM Tuesday
Low  tide  1.4 feet at  9:53 PM Tuesday
High tide  1.8 feet at  2:40 AM Wednesday
Low  tide -0.4 feet at 11:02 AM Wednesday
High tide  1.6 feet at  6:54 PM Wednesday
Low  tide  1.3 feet at 10:58 PM Wednesday

At Tanapag Harbor, Saipan...
Low  tide -0.4 feet at 10:33 AM Tuesday
High tide  2.1 feet at  6:37 PM Tuesday
Low  tide  1.7 feet at 10:49 PM Tuesday
High tide  2.1 feet at  3:28 AM Wednesday
Low  tide -0.4 feet at 11:30 AM Wednesday
High tide  2.2 feet at  7:20 PM Wednesday
Low  tide  1.6 feet at 11:52 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.

$$