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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 23, 2018 8:20 PM HST

Strong high pressure to the north will keep fresh to strong trade winds blowing through the rest of the weekend, with a slight drop off Monday. A Small Craft Advisory remains in effect for most waters east of Oahu through Sunday due to the breezy winds. Although the trades may slightly back off Monday, locally strong trades will remain likely over the typical channels around Maui County and south of the Big Island. Surf along east facing shores will remain rough due to the trade winds.

Surf along south facing shores is expected to trend back up next week as overlapping long-period south swells fill in due to recent activity across the southern Pacific. The first swell is currently building at the American Samoa buoy within the 12-13 second bands this afternoon, which should continue through the weekend as the second source fills in. The latest WAVEWATCH III guidance depicts this source peaking Monday at the Samoa buoy at 7 ft 15 seconds. Locally, surf will begin to build along south facing shores from the first source Tuesday, then become reinforced by Thursday as the second/larger source fills in. Surf may reach the south shore advisory level at the peak of this reinforcement by Thursday.

Looking ahead into the first week of July, the active trend could persist along south facing shores. The latest ECMWF and GFS guidance supports a gale-force low passing just south of the Tasman Sea and New Zealand Sunday through Monday with gales setting up within Hawaii's swell window.

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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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Pacific Sea Surface
Temperature Analysis

satellite-derived (updated twice weekly)
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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.