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FZPQ50 PGUM 210658
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
458 PM ChST Fri Nov 21 2025

.DISCUSSION...There will be a high risk of rip currents along north
and east facing reefs of the Marianas, which is leading to a high
surf advisory along north facing reefs. These are likely to continue
through at least Monday night. There will also be a moderate risk of
lightning starting around midnight tonight.

$$

GUZ001-MPZ001>003-212200-
Guam-Rota-Tinian-Saipan-
458 PM ChST Fri Nov 21 2025

...HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM CHST TUESDAY ALONG NORTH
FACING REEFS...
...HIGH RISK OF RIP CURRENTS THROUGH LATE MONDAY NIGHT ALONG NORTH AND
EAST FACING REEFS...

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

.TONIGHT...
Rip Current Risk.....High. Pounding surf will produce life
                     threatening rip currents at reefs and beaches.
Surf Height
      North facing reefs............8 to 10 feet.
      East  facing reefs............8 to 10 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................Northeast at 5 to 8 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at 2 to 3 feet.
      Secondary period.............11 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Winds...............Breezy. East at 15 to 25 mph.

.SATURDAY...
Rip Current Risk.....High. Pounding surf will produce life
                     threatening rip currents at reefs and beaches.
Surf Height
      North facing reefs............8 to 10 feet.
      East  facing reefs............8 to 10 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................Northeast at 5 to 8 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at 2 to 3 feet.
      Secondary period.............11 seconds.
Max Heat Index.........Around 100.
Winds...............Breezy. East at 15 to 25 mph.

.SATURDAY NIGHT...
Rip Current Risk.....High. Pounding surf will produce life
                     threatening rip currents at reefs and beaches.
Surf Height
      North facing reefs............8 to 10 feet.
      East  facing reefs............8 to 10 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................Northeast at 5 to 8 feet.
      Primary period...............9 seconds.
Winds...............Breezy. East at 15 to 25 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.0 feet at  7:04 PM Friday
Low  tide -0.5 feet at  2:25 AM Saturday
High tide  2.1 feet at  9:49 AM Saturday
Low  tide  1.5 feet at  3:04 PM Saturday
High tide  2.0 feet at  7:32 PM Saturday
Low  tide -0.5 feet at  3:00 AM Sunday
High tide  2.0 feet at 10:30 AM Sunday

At Rota Island...
High tide  1.9 feet at  7:01 PM Friday
Low  tide -0.5 feet at  2:19 AM Saturday
High tide  1.9 feet at  9:46 AM Saturday
Low  tide  1.4 feet at  2:58 PM Saturday
High tide  1.8 feet at  7:29 PM Saturday
Low  tide -0.5 feet at  2:54 AM Sunday
High tide  1.9 feet at 10:27 AM Sunday

At Tinian Island...
High tide  1.6 feet at  5:57 PM Friday
Low  tide -0.3 feet at  2:15 AM Saturday
High tide  1.6 feet at 10:28 AM Saturday
Low  tide  1.4 feet at  2:24 PM Saturday
High tide  1.6 feet at  6:25 PM Saturday
Low  tide -0.3 feet at  2:53 AM Sunday
High tide  1.6 feet at 11:22 AM Sunday

At Tanapag Harbor, Saipan...
High tide  2.0 feet at  6:53 PM Friday
Low  tide -0.2 feet at  2:35 AM Saturday
High tide  2.1 feet at 10:16 AM Saturday
Low  tide  1.7 feet at  2:58 PM Saturday
High tide  2.0 feet at  7:17 PM Saturday
Low  tide -0.2 feet at  3:09 AM Sunday
High tide  2.1 feet at 11:03 AM Sunday

* 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.

$$