Saipan Coastal Waters

PMZ154 · Coastal Waters Forecast, National Weather Service Tiyan GU · issued Sat, Oct 3, 4:00 AM GMT+10

Tropical Storm Warning in force. Today: Southwest tropical storm force wind to 45 kt. Gusts up to 60 kt. Seas 17 to 20 ft. Numerous locally heavy showers and scattered thunderstorms.

Saipan Coastal Waters on the map

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Tropical Storm Warning
Gale Warning

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Alerts in force

Tropical Storm Warning from Sat, Oct 3, 4:01 AM GMT+10 until Sat, Oct 3, 6:15 PM GMT+10

Tropical Storm Warning issued October 3 at 4:01AM ChST by NWS Tiyan GU

The full text

* WHAT...Southwest tropical storm force wind to 45 kt with gusts
to 60 kt and seas 14 to 20 feet.

* WHERE...Tinian and Saipan Coastal Waters.

* WHEN...Until further notice.

* IMPACTS...Very strong winds will cause hazardous seas which
could capsize or damage vessels and reduce visibility.

* ADDITIONAL DETAILS...Typhoon Choi-wan (26W) continues to
strengthen as it turns north-northeast near the northern
Marianas west of Pagan, with tropical storm force winds
continuing at Saipan. Hazardous seas continue.

A tropical storm warning means sustained winds of 34 to 63 kt are
expected due to a tropical storm within 36 hours.

The forecast

Coastal Waters Forecast from National Weather Service Tiyan GU, issued Sat, Oct 3, 4:00 AM GMT+10, valid until Sat, Oct 3, 7:30 PM GMT+10. Wind in knots, seas in feet.

TROPICAL STORM WARNING IN EFFECT

Today: Southwest tropical storm force wind to 45 kt. Gusts up to 60 kt. Seas 17 to 20 ft. Numerous locally heavy showers and scattered thunderstorms.
Tonight: Southwest wind 30 kt with gusts to 45 kt. Seas 16 to 18 ft. Scattered showers with isolated thunderstorms.
Sunday: Southwest wind 30 kt with gusts to 40 kt. Seas 14 to 16 ft. Scattered showers with isolated thunderstorms.
Sunday night: Southwest wind 30 kt. Seas 13 to 15 ft. Scattered showers with isolated thunderstorms.
Monday: Southwest wind 20 to 25 kt. Seas 11 to 13 ft. Wave Detail: West 11 ft at 9 seconds, southwest 7 ft at 8 seconds and northwest 3 ft at 13 seconds. A slight chance of thunderstorms.
Tuesday: Southwest wind 10 to 20 kt. Seas 8 to 10 ft. Wave Detail: West 9 ft at 9 seconds, southwest 4 ft at 6 seconds and northwest 3 ft at 13 seconds. A chance of showers with a slight chance of thunderstorms.
Wednesday: West wind 5 to 15 kt. Seas 5 to 7 ft. Wave Detail: West 6 ft at 9 seconds, northwest 3 ft at 13 seconds and west 2 ft at 4 seconds. A chance of showers with a slight chance of thunderstorms.

Synopsis

Synopsis for Marianas Waters

Strong to gale force southwesterlies will continue. Combined seas of 15 to 20 ft will persist through Saturday, then begin to gradually diminish as Typhoon Choi-wan (26W) moves away from the northern CNMI and brings elevated southwest monsoon swell to the Marianas. For Saipan and Tinian, a Tropical Storm Warning remains in effect. For Guam and Rota, a Gale Warning remains in effect. Mariners should continue monitoring the forecast for changes in the coming days.

The past year

Warnings, watches and advisories the National Weather Service issued for this zone over the past 12 months, from the Iowa Environmental Mesonet’s archive.

The archive of past products did not answer just now.

What this means

Marine forecasts give wind in knots (1 knot is 1.15 mph) and seas in feet, except the high seas forecasts, which give seas in meters. Seas are the significant wave height, the average of the highest third of the waves; individual waves may be more than twice that. On the Great Lakes the forecast gives waves, not seas. "Wave Detail" splits the seas into the wind waves and each swell, with its direction and period.

Each coastal office writes a Coastal Waters Forecast for the bays, sounds and ocean out to 20 to 60 nautical miles, or on the Great Lakes a Nearshore Marine Forecast within 5 nautical miles of shore; the Open Lakes Forecast covers the rest of each lake. The Ocean Prediction Center and the National Hurricane Center write the Offshore Waters Forecasts out to about 250 nautical miles, and the High Seas Forecasts beyond. Forecasts are issued at least twice a day and updated when they go wrong.

Small Craft Advisory: Winds or conditions hazardous to small boats. The thresholds are set by each NWS region: typically sustained winds or frequent gusts of 20 to 25 knots up to 33 knots, and seas of 5 to 7 feet or more.
Gale Warning: Sustained winds or frequent gusts of 34 to 47 knots, not from a tropical cyclone.
Storm Warning: Sustained winds or frequent gusts of 48 to 63 knots, not from a tropical cyclone.
Hurricane Force Wind Warning: Sustained winds or frequent gusts of 64 knots or more, not from a tropical cyclone.
Special Marine Warning: A thunderstorm or squall over the water with winds or gusts of 34 knots or more, hail of 3/4 inch or more, or a waterspout, for up to two hours.
Hazardous Seas Warning: Wave heights or steepness at or above the office’s warning threshold, when the wind alone does not warrant a warning.
Heavy Freezing Spray Warning: Spray freezing on a vessel at 2 cm (3/4 inch) an hour or more.
Tropical Storm and Hurricane Warnings: Tropical storm (34 to 63 knots) or hurricane (64 knots or more) conditions expected within 36 hours. Watches: possible within 48 hours.

Nearby

Open the live map with marine zones and buoys The hour-by-hour forecast for the middle of the zone Saipan Beaches Every Guam and Micronesia zone

Sources

Coastal Waters Forecast CWFGUM from National Weather Service Tiyan GU, issued Sat, Oct 3, 4:00 AM GMT+10. Original at NWS. Buoy reports from the National Data Buoy Center. Past products from the Iowa Environmental Mesonet. Zone outlines from the NWS marine and offshore zone boundaries. Warnings and advisories from the NWS API, read 20:46 UTC. All public domain, from the National Weather Service.