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Marine Weather Message in Effect for the Coastal Waters

Marine section from the Area Forecast Discussion
issued at: Sep 20, 2014 8:30 PM HST

An increase in trade winds could bring near small craft advisory conditions over the typically windier waters around the Big Island and Maui county by the middle of next week.

Surf should remain below advisory criteria along all shores through the forecast period. Small swells will provide small background surf along most shorelines of all the islands through the weekend. Then a couple of N and NW swells will reach the islands by Wednesday and Thursday, with a n/ne swell possible Thursday and Friday. Small long-period S swells will keep surf heights near or below seasonal averages along S facing shores next week.

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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 the help file 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.
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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.