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Marine Product Dissemination Information

Marine Weather Message in Effect for the Coastal Waters

Marine section from the Area Forecast Discussion
issued at: Dec 14, 2018 8:21 PM HST

Trade winds are expected to ease some tonight and Saturday, with the typically windier areas near Maui and the Big Island continuing to see Small Craft Advisory (SCA) level winds. The current northwest swell continues to bring elevated seas, maintaining SCA level seas for other coastal waters near Molokai through tonight.

With the trade winds easing, expect surf along east facing shores to lower. The High Surf Advisory (HSA) for east facing shores was thus cancelled.

A new northwest swell will arrive late in the day Saturday, and rise rapidly to warning levels. It is expected to peak Sunday, and then subside some on Monday. An even larger northwest swell will build late Monday, once again peaking at warning levels. Exposed coastal waters will once again rise to over 10 feet as these swells come rolling through.

Expect the current SCA to once again be expanded to most, if not all, the coastal waters for the first half of the new week as the new swells arrive.

See the latest Oahu Surf Discussion (SRDHFO) for additional details on surf and swell.

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The Marine Radiofax Charts for Station KVM-70 are now available via E-mail or FTP. Click here for more details on the charts available. For information on FTPMAIL click here.

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Pacific Streamline Analysis
(130E-110W,30S-30N)
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gif Latest 00Z 06Z 12Z 18Z Loop
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From the Unified Surface Analysis
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Temperature Analysis

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About the Marine Program

Routine forecast are issued for the Hawaiian Coastal Waters, the Offshore Waters, and High Seas. Coastal Waters are within 40 nautical miles of the main Hawaiian islands. The Offshore area extends from this 40 nautical mile mark to 240 nautical miles of the main Hawaiian islands. The High Seas forecasts are issued for an area that covers approximately 15,000,000 square miles, extends as far north as 30N, and as far south as 25S, and between 120W south of the equator and 140W north of the equator to 160E.
Marine Area of Responsibility Map for High Seas
Map of Coastal Marine Zones
Map of Offshore Marine Zones

The marine forecasts issued are based on marine observations and model data. Marine observations include buoy and ship reports. Ship reports are invaluable to the NWS, and are reported through the U.S. Voluntary Observing Ship Project. If you are a mariner, please consider joining the nearly 1,000 volunteer ships from around the world that observe the weather at their location.