Hawaiian Marine Products

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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: Mar 27, 2015 3:30 PM HST

A late morning scatterometer pass that sampled waters E of Oahu showed winds at or above small craft advisory criteria in waters N and S of the Big Island, but below criteria in other marine zones. Latest guidance from global and mesoscale models indicate that winds near 25 kt will continue over waters N and S of the Big Island overnight, where a SCA is in effect through 6 am Saturday. Trade winds are still expected to gradually ease through Saturday, and while a slight increase in wind speeds is expected sunday/ Monday, the expectation is that winds will remain below SCA speeds before winds diminish again somewhat Tuesday.

Not much surf to speak of currently, as lingering SSW and NNW swells gradually fade away through Saturday, and a small long-period SSE swell builds. A long-period NW swell will build and peak on Sunday, with peak surf heights nearing advisory levels along exposed N and W shores. This swell will gradually diminish in height and period through Tuesday. At its peak, this swell will bring combined seas close to the 10 ft threshold for SCA issuance. Swells arriving from the S will be relatively low in magnitude, but sufficiently large to keep some surf along S facing shores through the period, with the strongest source being a SSE swell that is currently on the rise. The recently updated Oahu surf discussion /srdhfo/ contains details on the sources of the expected swells.

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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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Map of 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.