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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 23, 2018 4:15 AM HST

An upper level disturbance west of the islands will maintain an unstable atmosphere over the region today, with heavy showers and some thunderstorms possible. Although the threat is for all waters, the greatest threat will be over the waters south and west of all islands, as well as the waters near Kauai due to the proximity to the upper level low. Expect reduced visibility, gusty winds and rough seas with the heavier showers and thunderstorms. The threat for heavy showers and thunderstorms will gradually shift north and west into Saturday.

Persistent strong high pressure northeast of the state will continue to produce an area of strong winds directed towards the area. A lingering surface trough, just west of the offshore waters will help to force a more southeast wind pattern for the state. The east-southeast/southeast winds have continue to increase over the last 12 hours, and some additional increase is likely today, with winds remaining elevated through most of next week. Model guidance suggests winds will increase further by the middle of next week, possibly reaching gale force, with the strongest winds around the Big Island and windward waters of the smaller islands, with the southeast flow being maintained through much of the event. The swell generated from these winds will continue to produce elevated surf along east-facing shores.

A High Surf Advisory for east facing shores today will continue through the weekend, and will likely continue into the middle of the week when surf could potentially reach warning levels. A Small Craft Advisory is posted across windward waters and around the Big Island for the combination of the elevated seas and increasing winds. As mentioned above, gale force winds are possible with the increasing winds next week.

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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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.