507
FZPQ50 PGUM 171807
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
407 AM ChST Wed Jun 18 2025

.DISCUSSION...There will be a low risk of rip currents along all
reefs and beaches through tonight. The trade-wind swell will build
overnight and into Thursday morning, which will allow the surf to
increase along east facing reefs and bring the risk of rip currents
up to moderate along east facing reefs. Seas and surf will fall
around a foot this weekend as trade-winds and swell subside.

$$

GUZ001-MPZ001>003-181000-
Guam-Rota-Tinian-Saipan-
407 AM ChST Wed Jun 18 2025

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

.TODAY...
Rip Current Risk.....Low  *.
Surf Height
      North facing reefs............1 to 3 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 2 to 3 feet.
      Primary period...............8 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Max Heat Index.........Around 101.
Winds...............East at around 10 mph.

.TONIGHT...
Rip Current Risk.....Low  *.
Surf Height
      North facing reefs............1 to 3 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 2 to 3 feet.
      Primary period...............8 seconds.
Winds...............East at 10 to 15 mph.

.THURSDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............1 to 3 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............2 to 3 feet.
      West  facing reefs............Around 1 foot.
Swell/Period
      Primary swell................East at 2 to 4 feet.
      Primary period...............8 seconds.
Max Heat Index.........Around 102.
Winds...............East at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  1.5 feet at  7:20 AM Wednesday
High tide  2.1 feet at 11:56 AM Wednesday
Low  tide  0.5 feet at  6:43 PM Wednesday
High tide  2.7 feet at  1:45 AM Thursday
Low  tide  1.2 feet at  8:17 AM Thursday
High tide  2.0 feet at  1:27 PM Thursday

At Rota Island...
Low  tide  1.5 feet at  7:14 AM Wednesday
High tide  2.0 feet at 11:53 AM Wednesday
Low  tide  0.5 feet at  6:37 PM Wednesday
High tide  2.5 feet at  1:42 AM Thursday
Low  tide  1.2 feet at  8:11 AM Thursday
High tide  1.9 feet at  1:24 PM Thursday

At Tinian Island...
Low  tide  1.1 feet at  7:08 AM Wednesday
High tide  1.3 feet at 11:12 AM Wednesday
Low  tide  0.2 feet at  6:11 PM Wednesday
High tide  1.8 feet at  1:22 AM Thursday
Low  tide  0.8 feet at  8:07 AM Thursday
High tide  1.2 feet at 12:57 PM Thursday

At Tanapag Harbor, Saipan...
Low  tide  1.2 feet at  7:50 AM Wednesday
High tide  1.6 feet at 12:05 PM Wednesday
Low  tide  0.2 feet at  6:48 PM Wednesday
High tide  2.3 feet at  1:54 AM Thursday
Low  tide  0.9 feet at  8:40 AM Thursday
High tide  1.5 feet at  1:35 PM Thursday

* 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. If caught in a
rip current, swim parallel to the beach rather than against the
current.

$$