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: Jun 26, 2016 3:24 AM HST

The overnight ASCAT pass clipped the Big Island and Maui waters and reflected advisory-level winds across the Alenuihaha Channel and the waters south of the Big Island. This lines up well with the latest model guidance, which supports extending the small craft advisory for these waters through tonight, as well as for the Pailolo Channel and Maalaea Bay waters. Elsewhere, the winds are projected to remain just below advisory levels through much of the week with fresh trade winds persisting south of high pressure. The latest nearshore wave model guidance indicates the maximum seas across these windier zones remaining just below advisory level through the week.

Out at the area beaches, rough surf will continue along the east facing beaches through the week due to strong trade winds south of high pressure centered north of the state. After another small southerly pulse moves through tonight through Tuesday with below advisory-level south shore surf, a decent stretch of small surf seems likely through the remainder of the week and much of the first week of July. The ECMWF-WAVE solution depicts a batch of gales setting up southeast of New Zealand within Hawaii's swell window around the second of July, which would support a slight increase in south shore surf through the second week of July. However, the WAVEWATCH III and ensemble guidance depict a weaker solution over this area southeast of New Zealand through this time.

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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.