784
FZPQ50 PGUM 311800
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
400 AM ChST Fri Aug 1 2025

.DISCUSSION...A moderate risk of rip currents will continue along
west and north facing reefs as the elevated west-northwest swell
persists. A strengthening secondary trade swell will likely allow a
moderate risk current risk to develop along east facing reefs by
Saturday. A moderate risk of lightning is expected by noon, to then
continue the next few days.

$$

GUZ001-MPZ001>003-010800-
Guam-Rota-Tinian-Saipan-
400 AM ChST Fri Aug 1 2025

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

.TODAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 5 feet.
      East  facing reefs............2 to 4 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............4 to 6 feet.
Swell/Period
      Primary swell................West at 3 to 5 feet.
      Primary period...............10 seconds.
      Secondary swell..............East at around 2 feet.
      Secondary period.............8 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Max Heat Index.........Around 101.
Winds...............Light and variable becoming north around 10 mph
with gusts to 25 mph in the afternoon.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 5 feet.
      East  facing reefs............2 to 4 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............4 to 6 feet.
Swell/Period
      Primary swell................West at 3 to 5 feet.
      Primary period...............10 seconds.
      Secondary swell..............East at around 2 feet.
      Secondary period.............8 seconds.
Winds...............North at 10 to 15 mph.

.SATURDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............2 to 3 feet.
      West  facing reefs............4 to 6 feet.
Swell/Period
      Primary swell................West at 3 to 5 feet.
      Primary period...............10 seconds.
      Secondary swell..............East at around 3 feet.
      Secondary period.............8 seconds.
Max Heat Index.........Around 101.
Winds...............North at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  0.8 feet at  7:15 AM Friday
High tide  1.9 feet at  1:34 PM Friday
Low  tide  1.4 feet at  6:37 PM Friday
High tide  2.3 feet at 12:39 AM Saturday
Low  tide  0.7 feet at  8:06 AM Saturday
High tide  1.9 feet at  3:21 PM Saturday

At Rota Island...
Low  tide  0.8 feet at  7:09 AM Friday
High tide  1.8 feet at  1:31 PM Friday
Low  tide  1.3 feet at  6:31 PM Friday
High tide  2.2 feet at 12:36 AM Saturday
Low  tide  0.6 feet at  8:00 AM Saturday
High tide  1.8 feet at  3:18 PM Saturday

At Tinian Island...
Low  tide  0.4 feet at  7:15 AM Friday
High tide  1.1 feet at  1:46 PM Friday
Low  tide  1.0 feet at  5:42 PM Friday
High tide  1.6 feet at 12:03 AM Saturday
Low  tide  0.3 feet at  8:07 AM Saturday
High tide  1.2 feet at  3:46 PM Saturday

At Tanapag Harbor, Saipan...
Low  tide  0.6 feet at  7:40 AM Friday
High tide  1.4 feet at  1:44 PM Friday
Low  tide  1.1 feet at  6:21 PM Friday
High tide  2.0 feet at 12:51 AM Saturday
Low  tide  0.5 feet at  8:29 AM Saturday
High tide  1.4 feet at  3:53 PM 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.

$$