FZPQ50 PGUM 230741
SRFGUM

Surf Zone Forecast for the Mariana Islands
National Weather Service Tiyan GU
541 PM ChST Sun Aug 23 2026

.DISCUSSION...
The High Surf Advisory and High Rip Current Risk Statement were 
extended due to the anticipation of a long-period, southwest swell 
from Tropical Depression 19W well to the west. Hazardous surf 
conditions may subside Monday night, so the hazards will be 
reassessed by then. There is a moderate risk of lightning for the 
next several days.

$$

GUZ001-MPZ001>003-232245-
Guam-Rota-Tinian-Saipan-
541 PM ChST Sun Aug 23 2026

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 PM CHST MONDAY NOW 
ALONG WEST-FACING REEFS...
...HIGH RISK OF RIP CURRENTS REMAINS THROUGH MONDAY AFTERNOON NOW 
ALONG WEST-FACING REEFS...

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

.TONIGHT...
Rip Current Risk.....High *. 
Surf Height
      North facing reefs............5 to 7 feet. 
      East  facing reefs............3 to 5 feet. 
      South facing reefs............4 to 6 feet. 
      West  facing reefs............7 to 9 feet. 
Swell/Period
      Primary swell................Southwest at 6 to 7 feet. 
      Primary period...............9 seconds. 
      Secondary swell..............North at 3 to 4 feet. 
      Secondary period.............10 seconds. 
      Tertiary swell...............Southeast at 2 to 3 feet.
      Tertiary period..............8 seconds.
Water Temperature
      Pago Bay buoy..........84 Degrees. 
Winds...............Southwest at 10 to 15 mph with gusts to 25 mph 
					near heavier showers.

.MONDAY...
Rip Current Risk.....High *. 
Surf Height
      North facing reefs............4 to 6 feet. 
      East  facing reefs............3 to 5 feet. 
      South facing reefs............5 to 7 feet. 
      West  facing reefs............8 to 10 feet. 
Swell/Period
      Primary swell................Southwest at 7 to 8 feet. 
      Primary period...............10 seconds. 
      Secondary swell..............North at 2 to 3 feet. 
      Secondary period.............10 seconds.
	  Tertiary swell...............Southeast at 2 to 3 feet.
      Tertiary period..............8 seconds.
Max Heat Index.........Around 101. 
Winds...............Southwest at 10 to 15 mph with gusts to 25 mph 
					near heavier showers.

.MONDAY NIGHT...
Rip Current Risk.....High *. 
Surf Height
      North facing reefs............4 to 6 feet. 
      East  facing reefs............3 to 5 feet. 
      South facing reefs............5 to 7 feet. 
      West  facing reefs............8 to 10 feet. 
Swell/Period
      Primary swell................Southwest at 7 to 8 feet. 
      Primary period...............10 seconds. 
      Secondary swell..............North at 2 to 3 feet. 
      Secondary period.............10 seconds.
	  Tertiary swell...............East at around 2 feet.
      Tertiary period..............12 seconds. 
Winds...............Southwest at 10 to 15 mph with gusts to 25 mph 
					near heavier showers.


Tide information for the next 36 hours...

At Apra Harbor, Guam...
High tide  2.1 feet at  6:18 PM Sunday
Low  tide  1.7 feet at 11:12 PM Sunday
High tide  2.1 feet at  3:37 AM Monday
Low  tide  0.2 feet at 11:14 AM Monday
High tide  2.2 feet at  6:52 PM Monday
Low  tide  1.7 feet at 11:56 PM Monday

At Rota Island...
High tide  2.0 feet at  6:15 PM Sunday
Low  tide  1.6 feet at 11:06 PM Sunday
High tide  1.9 feet at  3:34 AM Monday
Low  tide  0.2 feet at 11:08 AM Monday
High tide  2.1 feet at  6:49 PM Monday
Low  tide  1.6 feet at 11:50 PM Monday

At Tinian Island...
High tide  1.6 feet at  6:16 PM Sunday
Low  tide  0.6 feet at 10:49 PM Sunday
High tide  1.5 feet at  3:35 AM Monday
Low  tide  0.1 feet at 10:51 AM Monday
High tide  1.6 feet at  6:50 PM Monday
Low  tide0.5 feet at 11:33 PM Monday

At Tanapag Harbor, Saipan...
High tide  1.9 feet at  6:54 PM Sunday
Low  tide  1.7 feet at 10:40 PM Sunday
High tide  1.9 feet at  3:06 AM Monday
Low  tide  0.1 feet at 11:19 AM Monday
High tide  1.9 feet at  7:21 PM Monday
Low  tide  1.6 feet at 11:25 PM Monday

* 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.

$$