FZMY50 PGUM 151141
CWFGUM

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
941 PM ChST Wed Apr 15 2026

Marianas Waters out to 40 nautical miles

PMZ150-152030-
941 PM ChST Wed Apr 15 2026

.Synopsis for Marianas Waters...
The eye of Typhoon Sinlaku is moving northwest, away from Tinian
and Saipan. Due to the large wind field around the system, life
threatening marine conditions will persist through at least
Thursday for Guam, Thursday evening for Rota, and Thursday night
into Friday for Tinian and Saipan. In addition to winds, Sinlaku
will produce heavy showers and isolated thunderstorms through
tonight. Combined seas are expected to be around 15 to 20 ft for
Guam, 20 to 25 feet for Rota, and 25 to 30 feet for Tinian and
Saipan through tonight as Sinlaku moves through.

$$

PMZ151-152030-
Guam Coastal Waters-
941 PM ChST Wed Apr 15 2026

...TROPICAL STORM WARNING IN EFFECT...
...TYPHOON WATCH REMAINS IN EFFECT...

.TONIGHT...Southwest tropical storm force wind to 35 kt with
gusts to 50 kt. Seas 17 to 20 ft.
.THURSDAY...Southwest wind 30 kt with occasional gusts to 45 kt.
Seas 15 to 18 ft.
.THURSDAY NIGHT...Southwest wind 20 to 25 kt with gusts to 35 kt.
Seas 12 to 15 ft.
.FRIDAY...Southwest wind 15 to 20 kt with gusts to 30 kt. Seas
11 to 14 ft.
.FRIDAY NIGHT...West wind 15 kt with gusts to 25 kt. Seas 9 to
11 ft. Wave Detail: Northwest 10 ft at 10 seconds and west 5 ft
at 5 seconds.
.SATURDAY...Southwest wind 10 to 15 kt. Seas 7 to 9 ft. Wave
Detail: Northwest 9 ft at 10 seconds and west 3 ft at 4 seconds.
.SUNDAY...Southwest wind 5 to 10 kt. Seas 5 to 7 ft. Wave Detail:
North 7 ft at 10 seconds and southwest 2 ft at 4 seconds.

$$

PMZ152-152030-
Rota Coastal Waters-
941 PM ChST Wed Apr 15 2026

...TYPHOON WARNING IN EFFECT...

.TONIGHT...Southwest tropical storm force wind to 40 kt with
gusts to 60 kt. Seas 21 to 25 ft. Scattered showers with isolated
thunderstorms.
.THURSDAY...Southwest tropical storm force wind to 35 kt with
gusts to 50 kt. Seas 18 to 20 ft. Isolated thunderstorms.
.THURSDAY NIGHT...Southwest wind 20 to 25 kt with gusts to 35 kt.
Seas 14 to 16 ft.
.FRIDAY...Southwest wind 20 to 25 kt. Seas 12 to 14 ft.
.FRIDAY NIGHT...West wind 15 to 20 kt. Seas 10 to 12 ft. Wave
Detail: Northwest 11 ft at 10 seconds and west 5 ft at 5 seconds.
.SATURDAY...Southwest wind 10 to 15 kt. Seas 7 to 9 ft. Wave
Detail: Northwest 9 ft at 10 seconds and southwest 3 ft at
5 seconds.
.SUNDAY...Southwest wind 5 to 10 kt. Seas 6 to 8 ft. Wave Detail:
North 7 ft at 10 seconds and southwest 2 ft at 4 seconds.

$$

PMZ153-154-152030-
Tinian Coastal Waters-Saipan Coastal Waters-
941 PM ChST Wed Apr 15 2026

...TYPHOON WARNING IN EFFECT...

.TONIGHT...Southwest tropical storm force wind to 60 kt with
gusts to 85 kt. Seas 25 to 29 ft. Widespread showers with
isolated thunderstorms.
.THURSDAY...Southwest tropical storm force wind to 45 kt with
gusts to 60 kt. Seas 20 to 24 ft. Scattered showers with isolated
thunderstorms.
.THURSDAY NIGHT...Southwest tropical storm force wind to 35 kt
with gusts to 45 kt. Seas 16 to 19 ft. Scattered showers.
.FRIDAY...Southwest wind 20 to 25 kt with gusts to 35 kt. Seas
13 to 16 ft. Scattered showers.
.FRIDAY NIGHT...West wind 15 to 25 kt. Seas 10 to 12 ft. Wave
Detail: Northwest 11 ft at 10 seconds and west 5 ft at 7 seconds.
.SATURDAY...Southwest wind 10 to 15 kt. Seas 7 to 9 ft. Wave
Detail: Northwest 9 ft at 9 seconds and southwest 3 ft at
5 seconds.
.SUNDAY...Southwest wind 5 to 10 kt. Seas 6 to 8 ft. Wave Detail:
North 7 ft at 11 seconds and southwest 2 ft at 4 seconds.

$$