842
FZPQ50 PGUM 010643
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
443 PM ChST Mon Dec 1 2025

.DISCUSSION...Trade swell and a pulse of long-period north-northeast
swell are producing hazardous surf along north facing reefs and a
high risk of rip currents along north and east facing reefs. This is
expected through Tuesday afternoon for north facing reefs, with the
high rip risk continuing for east facing reefs through at least
Wednesday afternoon. Refracted swell waves are expected to slightly
add to surf along west and south reefs, so a moderate risk of rip
currents continues along south and west facing reefs through at
least Tuesday night. A moderate risk of lightning continues through
tonight for Guam.

$$

GUZ001-MPZ001>003-012200-
Guam-Rota-Tinian-Saipan-
443 PM ChST Mon Dec 1 2025

...HIGH SURF ADVISORY IN EFFECT UNTIL 5 PM CHST TUESDAY ALONG NORTH
FACING REEFS...
...HIGH RISK OF RIP CURRENTS THROUGH WEDNESDAY AFTERNOON ALONG NORTH
AND EAST FACING REEFS...

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

.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 10 feet.
      South facing reefs............4 to 6 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................East at 4 to 6 feet.
      Primary period...............8 seconds.
      Secondary swell..............Northeast at 2 to 4 feet.
      Secondary period.............13 to 14 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Winds...............East at 15 to 20 mph.

.TUESDAY...
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............8 to 10 feet.
      South facing reefs............4 to 6 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................East at 5 to 7 feet.
      Primary period...............8 seconds.
      Secondary swell..............Northeast at 3 to 4 feet.
      Secondary period.............13 seconds.
Max Heat Index.........Around 99.
Winds...............East at 15 to 20 mph.

.TUESDAY NIGHT...
Rip Current Risk.....High *.
Surf Height
      North facing reefs............7 to 8 feet.
      East  facing reefs............7 to 9 feet.
      South facing reefs............3 to 5 feet.
      West facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................East at 5 to 7 feet.
      Primary period...............8 seconds.
      Secondary swell..............Northeast at 2 to 4 feet.
      Secondary period.............13 seconds.
Winds...............East at 15 to 20 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  0.0 feet at 11:02 PM Monday
High tide  1.9 feet at  5:37 AM Tuesday
Low  tide  1.0 feet at 10:45 AM Tuesday
High tide  2.4 feet at  4:37 PM Tuesday
Low  tide -0.5 feet at 11:46 PM Tuesday
High tide  2.1 feet at  6:43 AM Wednesday

At Rota Island...
Low  tide  0.0 feet at 10:56 PM Monday
High tide  1.8 feet at  5:34 AM Tuesday
Low  tide  0.9 feet at 10:39 AM Tuesday
High tide  2.2 feet at  4:34 PM Tuesday
Low  tide -0.4 feet at 11:40 PM Tuesday
High tide  2.0 feet at  6:40 AM Wednesday

At Tinian Island...
Low  tide  0.0 feet at 10:33 PM Monday
High tide  1.2 feet at  5:06 AM Tuesday
Low  tide  0.8 feet at  9:38 AM Tuesday
High tide  1.8 feet at  3:42 PM Tuesday
Low  tide -0.3 feet at 11:18 PM Tuesday
High tide  1.4 feet at  6:26 AM Wednesday

At Tanapag Harbor, Saipan...
Low  tide  0.1 feet at 11:04 PM Monday
High tide  1.9 feet at  5:53 AM Tuesday
Low  tide  1.1 feet at 10:46 AM Tuesday
High tide  2.3 feet at  4:37 PM Tuesday
Low  tide -0.3 feet at 11:46 PM Tuesday
High tide  2.1 feet at  7:00 AM Wednesday

* 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.

$$