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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: Feb 15, 2019 11:37 AM HST

Strong high pressure far north of the state is currently being disrupted by a low located northeast of the Big Island. Winds will continue to be strong and gusty and out of the northeast for areas west of the Big Island through this afternoon and evening. Near the Big Island, winds will be a little more unpredictable due to the frequent showers and the low passing close to the area. But overall, winds will be mainly out of the north or northwest near the Big Island through this evening. The possibility for heavier showers and thunderstorms will remain near the Big Island and Maui County waters through this afternoon. As the low tracks north and west over the next few days, winds will begin to decrease in speed, and the direction will begin to shift to the north and then west over the weekend. Beyond the weekend, there is still quite a bit of uncertainty in the weather pattern due to an upper level low lingering near the state. But overall, winds will likely remain below Small Craft Advisory levels early next week.

The current northeast swell has decreased slightly compared to yesterday, but is still holding at heights well above normal. High Surf Advisories are posted for east facing shores through this afternoon, but will be extended at least through Saturday. A small to moderate northwest swell will begin to build on Saturday and is expected to peak at heights below advisory levels on Sunday.

A Small Craft Advisory (SCA) for all Hawaiian waters is posted through this afternoon, and will likely need to be extended for select zones as we get into the weekend.

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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
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From the Unified Surface 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.