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FZPQ50 PGUM 191751
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
351 AM ChST Thu Nov 20 2025

.DISCUSSION...A high risk of rip currents along east facing reefs,
and a moderate risk of rip currents along north facing reefs, are
expected for at least the rest of the week as elevated trade swell
lingers. A moderate risk of lightning is expected beginning Friday.

$$

GUZ001-MPZ001>003-200800-
Guam-Rota-Tinian-Saipan-
351 AM ChST Thu Nov 20 2025

...HIGH RISK OF RIP CURRENTS ALONG EAST FACING REEFS THROUGH LATE
MONDAY NIGHT...

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

.TODAY...
Rip Current Risk.....High *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............7 to 9 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 5 to 7 feet.
      Primary period...............8 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Max Heat Index.........Around 100.
Winds...............East at 10 to 20 mph.

.TONIGHT...
Rip Current Risk.....High *.
Surf Height
      North facing reefs............5 to 7 feet.
      East  facing reefs............7 to 9 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 6 to 8 feet.
      Primary period...............8 seconds.
Winds...............Breezy. East at 15 to 25 mph.

.FRIDAY...
Rip Current Risk.....High *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............7 to 9 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 6 to 8 feet.
      Primary period...............8 seconds.
Max Heat Index.........Around 100.
Winds...............Breezy. East at 15 to 25 mph.

Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.1 feet at  8:34 AM Thursday
Low  tide  1.3 feet at  1:48 PM Thursday
High tide  2.0 feet at  6:38 PM Thursday
Low  tide -0.5 feet at  1:54 AM Friday
High tide  2.1 feet at  9:11 AM Friday
Low  tide  1.4 feet at  2:26 PM Friday

At Rota Island...
High tide  1.9 feet at  8:31 AM Thursday
Low  tide  1.3 feet at  1:42 PM Thursday
High tide  1.9 feet at  6:35 PM Thursday
Low  tide -0.4 feet at  1:48 AM Friday
High tide  2.0 feet at  9:08 AM Friday
Low  tide  1.3 feet at  2:20 PM Friday

At Tinian Island...
High tide  1.5 feet at  8:45 AM Thursday
Low  tide  1.3 feet at 12:44 PM Thursday
High tide  1.6 feet at  5:33 PM Thursday
Low  tide -0.3 feet at  1:40 AM Friday
High tide  1.5 feet at  9:36 AM Friday
Low  tide  1.4 feet at  1:33 PM Friday

At Tanapag Harbor, Saipan...
High tide  2.0 feet at  8:54 AM Thursday
Low  tide  1.6 feet at  1:38 PM Thursday
High tide  2.1 feet at  6:31 PM Thursday
Low  tide -0.2 feet at  2:03 AM Friday
High tide  2.1 feet at  9:34 AM Friday
Low  tide  1.6 feet at  2:19 PM 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.

$$