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: May 22, 2017 8:47 PM HST

Trade winds continue to build across the state as high pressure moves far north of the islands. The Small Craft Advisory remains in effect for the typically windy zones around Maui County and the Big Island, as well as additional areas further to the west, through Wednesday. Trade winds are forecast to peak overnight and Tuesday, then weaken beginning Wednesday.

Northwest swell should peak overnight at the nearshore buoys, with resulting surf remaining below advisory levels on north and west facing shores. This swell is forecast to gradually decline while veering around to the NNW through Wednesday. A series of small and short-period NNE swells are expected later this week into the weekend.

The current small south swell will linger through Wednesday. A larger south swell is expected to arrive Friday and continue through most of the Memorial Day weekend. This swell may produce advisory level surf of 8 feet or greater along south facing shores. In addition, the combination of swell energy, high astronomical tides associated with the new moon, and ongoing higher than predicted water levels due to oceanographic factors, will likely result in minor coastal flooding due to wave run-up along south facing shores later this week and during the weekend, especially near the high tide times.

East facing shores will see short-period swell and choppy surf during the next couple of days due to the breezy trade winds.

For more detailed information on surf for Oahu, see the latest Collaborative Nearshore Swell and Wind Forecast (www.prh.noaa.gov/hnl/pages/SRF.php#Discussion).

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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.

Graphic Forecasts
for Hawaiian Islands and surrounding coastal waters
Pacific Streamline Analysis
(130E-110W,30S-30N)
tif Latest 00Z 06Z 12Z 18Z  
gif Latest 00Z 06Z 12Z 18Z Loop
North Pacific Surface Analysis
(130E-110W,EQ-60N)
From the Unified Surface Analysis
gif Latest 00Z 06Z 12Z 18Z Loop
Pacific Surface Forecast
(130E-110W,30S-50N)
gif 12Z Charts 24 hr 48 hr 72 hr
gif 00Z Charts 24 hr 48 hr 72 hr
Pacific Wind Wave
Analysis and Forecasts
12Z Charts
tif Analysis 24 hr 48 hr 72 hr
gif Analysis 24 hr 48 hr 72 hr
00Z Charts
tif Analysis 24 hr 48 hr 72 hr
gif Analysis 24 hr 48 hr 72 hr
Pacific Significant Cloud Features
(160E-110W, 30S-50N)
gif Latest 03Z 15Z
Pacific Sea Surface
Temperature Analysis

satellite-derived (updated twice weekly)
Symbols & Test Chart (gif)
Symbols & Test Chart (TIF)

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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
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.