220
FZPQ50 PGUM 181814
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
414 AM ChST Wed Nov 19 2025

.DISCUSSION...There will be a moderate risk of rip currents along
north and east facing reefs of the Marianas through Thursday. Trade-
wind swell and surf will then build Thursday night and Friday causing
the risk of rip currents to become high. There will be a moderate
risk for lighting for Guam this morning, then for all of the Marianas
beginning Thursday night.

$$

GUZ001-MPZ001>003-190900-
Guam-Rota-Tinian-Saipan-
414 AM ChST Wed Nov 19 2025

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

.TODAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 5 feet.
      East  facing reefs............5 to 7 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................Northeast at 4 to 6 feet.
      Primary period...............8 seconds.
Water Temperature
      Ritidian buoy..........85 Degrees.
Max Heat Index.........Around 100.
Winds...............East at 15 to 20 mph.

.TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 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 5 to 7 feet.
      Primary period...............8 seconds.
Winds...............East at 15 to 20 mph.

.THURSDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 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 5 to 7 feet.
      Primary period...............8 seconds.
Max Heat Index.........Around 101.
Winds...............East at 15 to 20 mph.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.0 feet at  7:55 AM Wednesday
Low  tide  1.3 feet at  1:08 PM Wednesday
High tide  2.1 feet at  6:14 PM Wednesday
Low  tide -0.4 feet at  1:26 AM Thursday
High tide  2.1 feet at  8:34 AM Thursday
Low  tide  1.3 feet at  1:48 PM Thursday

At Rota Island...
High tide  1.9 feet at  7:52 AM Wednesday
Low  tide  1.2 feet at  1:02 PM Wednesday
High tide  2.0 feet at  6:11 PM Wednesday
Low  tide -0.3 feet at  1:20 AM Thursday
High tide  1.9 feet at  8:31 AM Thursday
Low  tide  1.3 feet at  1:42 PM Thursday

At Tinian Island...
High tide  1.4 feet at  7:52 AM Wednesday
Low  tide  1.2 feet at 11:59 AM Wednesday
High tide  1.6 feet at  5:12 PM Wednesday
Low  tide -0.2 feet at  1:07 AM Thursday
High tide  1.5 feet at  8:45 AM Thursday
Low  tide  1.3 feet at 12:44 PM Thursday

At Tanapag Harbor, Saipan...
High tide  2.0 feet at  8:13 AM Wednesday
Low  tide  1.5 feet at 12:55 PM Wednesday
High tide  2.1 feet at  6:11 PM Wednesday
Low  tide -0.1 feet at  1:31 AM Thursday
High tide  2.0 feet at  8:54 AM Thursday
Low  tide  1.6 feet at  1:38 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.

$$