Coastal Waters Forecast
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FZMY50 PGUM 231220
CWFMY

Coastal Waters Forecast for the Mariana Islands
National Weather Service Tiyan GU
1002 PM ChST Mon Oct 23 2017

Marianas Waters out to 40 nautical miles

PMZ150-232100-
1002 PM ChST Mon Oct 23 2017

.Synopsis for Marianas Waters...Large long-period swell from distant
Typhoon Lan will continue to move through the Marianas. Tropical
Depression 27W, southeast of the Marianas, is expected to pass
just southwest of Guam on Tuesday and will bring stronger winds
and rougher seas beginning tonight. Therefore a Small Craft
Advisory remains in effect for all the Marianas. There is also a
Tropical Storm Watch, in case 27W either intensifies faster or
moves closer than currently forecast. Showers and thunderstorms
will increase as Tropical Depression 27W approaches on Tuesday.

$$

PMZ151-152-232100-
Guam Coastal Waters-Rota Coastal Waters-
1002 PM ChST Mon Oct 23 2017

...TROPICAL STORM WATCH IN EFFECT...
...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY AFTERNOON...

Updated for improving weather tonight.

.REST OF TONIGHT...Northeast wind 10 to 15 kt veering east 15 to
25 kt with gusts to 35 kt. Wind waves 2 ft or less becoming 3 to 5
ft. West swell 8 to 10 ft and east 4 ft shifting to the north and
northwest 7 ft. Isolated thunderstorms.
.TUESDAY...Tropical storm force wind possible. Southeast wind 25
to 35 kt with gusts to 45 kt. Combined seas 16 to 18 ft. Frequent
locally heavy showers and scattered thunderstorms. Visibility 1 NM
or less.
.TUESDAY NIGHT...Southeast wind 20 to 30 kt with gusts to 40 kt.
Wind waves 5 to 7 ft. Mixed swell south 9 ft and northwest 7 ft.
Occasional showers and isolated thunderstorms.
.WEDNESDAY...Southeast wind 20 to 30 kt with gusts to 40 kt. Wind
waves 5 to 7 ft. Mixed swell south 9 ft and northwest 6 ft.
Scattered showers and isolated thunderstorms.
.WEDNESDAY NIGHT...Southeast wind 5 to 15 kt with gusts to 25 kt.
Wind waves 2 to 4 ft. Mixed swell south 7 to 9 ft and northwest 5
to 6 ft. Scattered showers and isolated thunderstorms.
.THURSDAY...Southeast wind 5 to 15 kt. Wind waves 2 ft or less.
Mixed swell south 5 to 7 ft and northwest 3 to 4 ft. Isolated
thunderstorms.
.FRIDAY...East wind 10 kt. Wind waves 2 ft or less. Southwest
swell 4 to 6 ft and northwest 3 ft. Isolated thunderstorms.
.SATURDAY...East wind 5 to 15 kt. Wind waves 2 ft or less.
Northwest swell 3 to 5 ft and southwest 3 ft.


$$

PMZ153-154-232100-
Tinian Coastal Waters-Saipan Coastal Waters-
1002 PM ChST Mon Oct 23 2017

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY AFTERNOON...

Updated for improving weather tonight.

.REST OF TONIGHT...East wind 10 to 15 kt rising to 15 to 25 kt. Wind
waves 2 to 4 ft. West swell 8 to 10 ft and east 4 ft shifting to
the north and northwest 7 ft. Isolated thunderstorms.
.TUESDAY...Southeast wind 20 to 30 kt with gusts to 40 kt. Wind
waves 4 to 6 ft. Mixed swell east 9 ft and northwest 7 ft.
Occasional showers and isolated thunderstorms. Visibility 1 NM or
less.
.TUESDAY NIGHT...Southeast wind 20 to 30 kt. Wind waves 4 to 6
ft. Mixed swell south 9 ft and northwest 7 ft. Occasional showers
and isolated thunderstorms.
.WEDNESDAY...Southeast wind 20 to 30 kt. Wind waves 4 to 6 ft.
Mixed swell south 9 ft and northwest 6 ft. Scattered showers and
isolated thunderstorms.
.WEDNESDAY NIGHT...Southeast wind 10 to 20 kt. Wind waves 2 to 4
ft. Mixed swell south 7 to 9 ft and northwest 5 to 6 ft.
Scattered showers and isolated thunderstorms.
.THURSDAY...East wind 5 to 15 kt. Wind waves 2 ft or less. South
swell 6 to 8 ft and northwest 3 to 4 ft. Isolated thunderstorms.
.FRIDAY...East wind 5 to 10 kt. Wind waves 2 ft or less.
Southwest swell 4 to 6 ft and northwest 3 ft. Isolated
thunderstorms.
.SATURDAY...East wind 5 to 15 kt. Wind waves 2 ft or less.
Northwest swell 3 to 5 ft and southwest 3 ft.

$$



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