188
FZPQ50 PGUM 031223 RRA
SRFGUM

Surf Zone Forecast for the Mariana Islands...DELAYED
National Weather Service Tiyan GU
1023 PM ChST Wed Dec 3 2025

.DISCUSSION...The primary east swell and a pulse of long-period
northeast swell are producing hazardous surf along north facing
reefs and a high risk of rip currents along north and east facing
reefs. There is a moderate risk of rip currents along south
facing reefs due to refracting the eastern swell. These conditions
are expected to begin to improve over the overnight hours as the
two swells begin to relax. There is a moderate risk of lightning
for Guam and Rota Thursday night as a trough passes near the
Marianas.

$$

GUZ001-MPZ001>003-040330-
Guam-Rota-Tinian-Saipan-
1023 PM ChST Wed Dec 3 2025

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM CHST THURSDAY
ALONG NORTH FACING REEFS...
...HIGH RISK OF RIP CURRENTS REMAINS THROUGH LATE TONIGHT ALONG
NORTH AND EAST FACING REEFS...

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

.TONIGHT...
Rip Current Risk.....High. Pounding surf will produce life
                     threatening rip currents at reefs and beaches.
Surf Height
      North facing reefs............7 to 9 feet.
      East  facing reefs............7 to 9 feet.
      South facing reefs............3 to 5 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 6 to 8 feet.
      Primary period...............9 seconds.
      Secondary swell..............Northeast at around 3 feet.
      Secondary period.............13 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Winds...............Southeast to east at 10 to 20 mph.

.THURSDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 7 feet.
      East  facing reefs............6 to 8 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............8 seconds.
      Secondary swell..............Northeast at around 3 feet.
      Secondary period.............13 seconds.
Max Heat Index.........Around 99.
Winds...............Southeast to east at 10 to 20 mph.

.THURSDAY NIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............5 to 7 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............5 to 7 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 3 to 5 feet.
      Primary period...............8 seconds.
      Secondary swell..............Northeast at around 3 feet.
      Secondary period.............13 seconds.
Winds...............East at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide -0.8 feet at 12:31 AM Thursday
High tide  2.3 feet at  7:42 AM Thursday
Low  tide  1.3 feet at 12:44 PM Thursday
High tide  2.4 feet at  5:55 PM Thursday
Low  tide -1.1 feet at  1:17 AM Friday
High tide  2.4 feet at  8:36 AM Friday

At Rota Island...
Low  tide -0.8 feet at 12:25 AM Thursday
High tide  2.1 feet at  7:39 AM Thursday
Low  tide  1.3 feet at 12:38 PM Thursday
High tide  2.3 feet at  5:52 PM Thursday
Low  tide -1.0 feet at  1:11 AM Friday
High tide  2.2 feet at  8:33 AM Friday

At Tinian Island...
Low  tide -0.5 feet at 12:04 AM Thursday
High tide  1.5 feet at  7:36 AM Thursday
Low  tide  1.3 feet at 11:26 AM Thursday
High tide  2.0 feet at  4:54 PM Thursday
Low  tide -0.7 feet at 12:54 AM Friday
High tide  1.7 feet at  8:41 AM Friday

At Tanapag Harbor, Saipan...
Low  tide -0.6 feet at 12:31 AM Thursday
High tide  2.3 feet at  8:01 AM Thursday
Low  tide  1.6 feet at 12:41 PM Thursday
High tide  2.4 feet at  5:46 PM Thursday
Low  tide -0.8 feet at  1:20 AM Friday
High tide  2.4 feet at  8:57 AM 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.

$$