241
FZPQ50 PGUM 021802
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
402 AM 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.
These conditions are expected to begin to improve after this
afternoon as the two swells decrease. There is a moderate risk of
lightning for Guam this morning due to thunderstorms moving through
the southern waters of Guam, and then again for Guam and Rota Thursday
night as a trough passes near the Marianas.

$$

GUZ001-MPZ001>003-030915-
Guam-Rota-Tinian-Saipan-
402 AM ChST Wed Dec 3 2025

...HIGH SURF ADVISORY IN EFFECT UNTIL 4 PM CHST THIS AFTERNOON ALONG
NORTH FACING REEFS...
...HIGH RIP CURRENT RISK IN EFFECT THROUGH THIS AFTERNOON ALONG NORTH
AND EAST FACING REEFS...

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

.TODAY...
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 5 to 6 feet.
      Primary period...............10 seconds.
      Secondary swell..............Northeast at around 4 feet.
      Secondary period.............13 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Max Heat Index.........Around 96.
Winds...............East at 15 to 20 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............6 to 8 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...............9 seconds.
      Secondary swell..............Northeast at around 3 feet.
      Secondary period.............13 seconds.
Winds...............Southeast 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 98.
Winds...............Southeast at 10 to 15 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.1 feet at  6:43 AM Wednesday
Low  tide  1.2 feet at 11:45 AM Wednesday
High tide  2.4 feet at  5:15 PM Wednesday
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

At Rota Island...
High tide  2.0 feet at  6:40 AM Wednesday
Low  tide  1.1 feet at 11:39 AM Wednesday
High tide  2.3 feet at  5:12 PM Wednesday
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

At Tinian Island...
High tide  1.4 feet at  6:26 AM Wednesday
Low  tide  1.1 feet at 10:30 AM Wednesday
High tide  1.9 feet at  4:16 PM Wednesday
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

At Tanapag Harbor, Saipan...
High tide  2.1 feet at  7:00 AM Wednesday
Low  tide  1.4 feet at 11:41 AM Wednesday
High tide  2.4 feet at  5:10 PM Wednesday
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 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.

$$