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FZPQ50 PGUM 031026 AAA
SRFGUM

Surf Zone Forecast for the Mariana Islands...UPDATED
National Weather Service Tiyan GU
826 PM ChST Sun Aug 3 2025

Update for the increase in lightning potential for CNMI.

.DISCUSSION...A moderate risk of rip currents is expected along west,
north, and east facing reefs of the Marianas through Monday. As east
swell overtakes the west swell by Monday night, rip current risk is
likely to drop to low along west facing reefs. A moderate risk of
lightning is expected tonight.

$$

GUZ001-MPZ001>003-031900-
Guam-Rota-Tinian-Saipan-
826 PM ChST Sun Aug 3 2025

36 hour Surf Zone Forecast for the Marianas from 817 PM Sunday
through 600 AM Tuesday

.REST OF TONIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............4 to 6 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............2 to 4 feet.
      West  facing reefs............4 to 6 feet.
Swell/Period
      Primary swell................West at 3 to 4 feet.
      Primary period...............10 seconds.
      Secondary swell..............East at around 3 feet.
      Secondary period.............9 seconds.
Water Temperature
      Ritidian buoy..........86 Degrees.
Winds...............Southeast at 10 to 15 mph.

.MONDAY...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............3 to 5 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............3 to 5 feet.
Swell/Period
      Primary swell................East at 3 feet.
      Primary period...............9 seconds.
      Secondary swell..............West at around 3 feet.
      Secondary period.............9 seconds.
Max Heat Index.........Around 103.
Winds...............East at 10 to 15 mph.

.MONDAY NIGHT...
Rip Current Risk.....Moderate *.
Surf Height
      North facing reefs............2 to 4 feet.
      East  facing reefs............3 to 5 feet.
      South facing reefs............1 to 3 feet.
      West  facing reefs............2 to 4 feet.
Swell/Period
      Primary swell................East at 2 to 4 feet.
      Primary period...............8 seconds.
      Secondary swell..............West at around 2 feet.
      Secondary period.............9 seconds.
Winds...............East at 10 to 15 mph.

Tide information for the next 36 hours...

At Apra Harbor, Guam...
Low  tide  1.8 feet at  8:49 PM Sunday
High tide  2.2 feet at  1:57 AM Monday
Low  tide  0.3 feet at  9:56 AM Monday
High tide  2.1 feet at  6:01 PM Monday
Low  tide  1.9 feet at 10:14 PM Monday
High tide  2.2 feet at  2:54 AM Tuesday


At Rota Island...
Low  tide  1.7 feet at  8:43 PM Sunday
High tide  2.1 feet at  1:54 AM Monday
Low  tide  0.3 feet at  9:50 AM Monday
High tide  2.0 feet at  5:58 PM Monday
Low  tide  1.7 feet at 10:08 PM Monday
High tide  2.1 feet at  2:51 AM Tuesday


At Tinian Island...
High tide  1.6 feet at  1:04 AM Monday
Low  tide  0.0 feet at  9:47 AM Monday
High tide  1.4 feet at  6:21 PM Monday
Low  tide  1.4 feet at  8:56 PM Monday
High tide  1.6 feet at  1:49 AM Tuesday
Low  tide -0.1 feet at 10:34 AM Tuesday

At Tanapag Harbor, Saipan...
High tide  2.0 feet at  1:37 AM Monday
Low  tide  0.2 feet at 10:12 AM Monday
High tide  1.7 feet at  6:47 PM Monday
Low  tide  1.7 feet at  9:13 PM Monday
High tide  2.0 feet at  2:17 AM Tuesday
Low  tide  0.0 feet at 10:58 AM Tuesday


* 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.

$$