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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: Feb 17, 2019 3:47 AM HST

A surface low about 210 nm northeast of Maui is forecast to track west through Monday. A trough extends southwest of the low to the Alenuihaha Channel. There will be fresh to strong north winds west of the trough and light to moderate variable winds east of the trough. As the trough shifts west over the next few day, fresh to strong southeast winds will spread over the eastern offshore waters, but are not expected to reach the Hawaiian Coastal Waters.

Seas at NOAA Buoy 51000 northeast of the islands have subsided to 14 ft, 11 seconds as of 2 AM Sunday. Surf from this swell is expected to remain at High Surf Advisory (HSA) levels along north facing shores through Sunday and at High Surf Warning (HSW) levels along east facing shores (where the threshold is lower). A new west northwest swell should peak today. Surf from this swell is expected to remain below HSA levels.

A Small Craft Advisory (SCA) is in effect through late tonight for most Hawaiian Waters, mainly for the large seas associated with the northeast swell, however winds will remain above SCA levels today in waters around Kauai County. With the new west northwest swell building today, expect seas to remain above the 10 ft SCA threshold in many locations at least through tonight.

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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 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 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.