317
FZPQ50 PGUM 210650
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
450 PM ChST Thu Aug 21 2025

.DISCUSSION...There will be a moderate risk of rip currents along
east facing reefs through tonight. On Friday, the rip risk for east
facing reefs drops to low and rip risk is expected to remain low for
all reefs through the weekend. There will also be a moderate risk of
lightning through the weekend.

$$

GUZ001-MPZ001>003-212200-
Guam-Rota-Tinian-Saipan-
450 PM ChST Thu Aug 21 2025

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

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............1 to 3 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at around 3 feet.
      Primary period...............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Winds...............East at 10 to 15 mph.

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

.FRIDAY NIGHT...
Rip Current Risk.....Low *.
Surf Height
      North facing reefs............1 to 2 feet.
      East  facing reefs............2 to 4 feet.
      South facing reefs............1 to 2 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at 1 to 3 feet.
      Primary period...............8 seconds.
Winds...............East at 5 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.5 feet at  7:41 PM Thursday
Low  tide  1.6 feet at 12:56 AM Friday
High tide  2.5 feet at  5:56 AM Friday
Low  tide -0.2 feet at  1:12 PM Friday
High tide  2.5 feet at  8:12 PM Friday
Low  tide  1.4 feet at  1:39 AM Saturday

At Rota Island...
High tide  2.3 feet at  7:38 PM Thursday
Low  tide  1.5 feet at 12:50 AM Friday
High tide  2.4 feet at  5:53 AM Friday
Low  tide -0.2 feet at  1:06 PM Friday
High tide  2.3 feet at  8:09 PM Friday
Low  tide  1.4 feet at  1:33 AM Saturday

At Tinian Island...
High tide  1.6 feet at  7:27 PM Thursday
Low  tide  1.3 feet at 11:56 PM Thursday
High tide  1.8 feet at  4:51 AM Friday
Low  tide -0.3 feet at 12:42 PM Friday
High tide  1.6 feet at  7:56 PM Friday
Low  tide  1.1 feet at 12:49 AM Saturday

At Tanapag Harbor, Saipan...
High tide  2.2 feet at  7:56 PM Thursday
Low  tide  1.5 feet at 12:52 AM Friday
High tide  2.2 feet at  5:54 AM Friday
Low  tide -0.3 feet at  1:17 PM Friday
High tide  2.2 feet at  8:28 PM Friday
Low  tide  1.3 feet at  1:46 AM Saturday

* 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.

$$