451
FZMY50 PGUM 181803
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
403 AM ChST Wed Nov 19 2025

Marianas Waters out to 40 nautical miles

PMZ150-190900-
403 AM ChST Wed Nov 19 2025

.Synopsis for Marianas Waters...
Moderate to fresh trade winds are expected throughout the week.
Combined seas of 5 to 7 feet are expected to increase to between
7 and 10 feet by Friday, becoming hazardous to small craft. In
tandem with the trade-wind surge, showers and thunderstorms will
increase for Friday and Saturday.

$$

PMZ151-152-190900-
Guam Coastal Waters-Rota Coastal Waters-
403 AM ChST Wed Nov 19 2025

.TODAY...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail: East
6 ft at 8 seconds and east 4 ft at 4 seconds. Isolated
thunderstorms early this morning for Guam waters.
.TONIGHT...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail:
East 8 ft at 7 seconds and east 4 ft at 4 seconds.
.THURSDAY...East wind 20 kt. Seas 6 to 8 ft. Wave Detail: East
7 ft at 8 seconds and east 4 ft at 4 seconds.
.THURSDAY NIGHT...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave
Detail: East 8 ft at 7 seconds and east 4 ft at 4 seconds.
.FRIDAY AND SATURDAY...East wind 20 kt. Seas 8 to 10 ft. Wave
Detail: East 8 ft at 8 seconds, east 5 ft at 4 seconds and north
3 ft at 11 seconds. A chance of showers with a slight chance of
thunderstorms.
.SUNDAY...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail:
East 8 ft at 9 seconds and east 4 ft at 4 seconds.

$$

PMZ153-154-190900-
Tinian Coastal Waters-Saipan Coastal Waters-
403 AM ChST Wed Nov 19 2025

.TODAY...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail: East
6 ft at 8 seconds and east 4 ft at 4 seconds.
.TONIGHT...East wind 20 kt. Seas 6 to 8 ft. Wave Detail: East 6
ft at 8 seconds and east 3 ft at 5 seconds.
.THURSDAY...East wind 20 kt. Seas 6 to 8 ft. Wave Detail: East
7 ft at 8 seconds and east 3 ft at 4 seconds.
.THURSDAY NIGHT...East wind 20 kt. Seas 7 to 9 ft. Wave Detail:
East 7 ft at 8 seconds and east 4 ft at 4 seconds. Isolated
thunderstorms.
.FRIDAY...East wind 20 kt. Seas 8 to 10 ft. Wave Detail: East 8
ft at 8 seconds, east 5 ft at 4 seconds and north 3 ft at 11
seconds. Scattered showers with a slight chance of thunderstorms.
.SATURDAY...East wind 15 to 20 kt. Seas 8 to 10 ft. Wave Detail:
East 8 ft at 9 seconds, east 5 ft at 4 seconds and north 2 ft at
11 seconds. A chance of showers with a slight chance of
thunderstorms.
.SUNDAY...East wind 20 kt. Seas 7 to 9 ft. Wave Detail: East 8 ft
at 9 seconds and east 4 ft at 4 seconds.

$$