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: Apr 28, 2017 4:46 AM HST

A complex weather pattern is expected for the next several days, introducing a slight chance for thunderstorms across most of the coastal waters today through Monday. A front and upper level trough just west of Kauai will continue to move southeast before stalling over the central islands Saturday. Small Craft Advisory winds and seas will fill in over the waters surrounding Kauai today as the front passes. A small break in thunderstorm chances should occur behind the front, before spreading across all waters late Saturday as an upper low and developing surface low slide over the island chain. The forecast confidence remains low on the exact placement of thunderstorm activity, but mariners should stay tuned to the updated forecast today and this weekend.

Surf along north facing shores will see a small bump tonight into Saturday from a short period choppy swell associated with the stronger winds behind the front. Surf will stay below advisory conditions. A series of small, longer period northwest swells are then expected for next week.

A series of long period south swells will grace the south facing shores into next week. The first set of swells will bring advisory level surf (8 ft) to exposed south facing shores today into early Saturday morning. A High Surf Advisory has been posted. Please refer to the Coastal Hazard Message, CFWHFO, for more information. Surf this weekend, along with a reinforcing south swell Monday and Tuesday remain borderline for advisory conditions.

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Marine Graphics

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 00Z Charts 24 hr 48 hr 72 hr
gif 12Z Charts 24 hr 48 hr 72 hr
Pacific Wind Wave
Analysis and Forecasts
00Z Charts
tif Analysis 24 hr 48 hr 72 hr
gif Analysis 24 hr 48 hr 72 hr
12Z 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.