410
FZPQ50 PGUM 200610
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
410 PM 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>003-202200-
Guam-Rota-Tinian-Saipan-
410 PM ChST Thu Nov 20 2025

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

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

.TONIGHT...
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.
Winds...............East at 15 to 20 mph with gusts to 30 mph
through the evening.

.FRIDAY...
Rip Current Risk.....High. Pounding surf will produce life
                     threatening rip currents at reefs and beaches.
Surf Height
      North facing reefs............5 to 7 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................East at 6 to 8 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at 2 to 3 feet.
      Secondary period.............12 seconds.
Max Heat Index.........Around 100.
Winds...............East at 15 to 20 mph with gusts to 30 mph.

.FRIDAY NIGHT...
Rip Current Risk.....High. Pounding surf will produce life
                     threatening rip currents at reefs and beaches.
Surf Height
      North facing reefs............5 to 7 feet.
      East  facing reefs............9 to 11 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 7 to 9 feet.
      Primary period...............9 seconds.
      Secondary swell..............North at 2 to 3 feet.
      Secondary period.............11 seconds.
Winds...............East at 15 to 20 mph with gusts to 30 mph
through the evening.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
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
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

At Rota Island...
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
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

At Tinian Island...
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
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

At Tanapag Harbor, Saipan...
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
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 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.

$$