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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: Oct 22, 2018 9:26 PM HST

A Small Craft Advisory remains in effect for the windier areas near Maui and the Big Island through Wednesday night. The pressure gradient over the islands should weaken Wednesday night as the weak trough passing south of the region weakens.

A High Surf Advisory for south facing shores remains in effect through Tuesday afternoon. South swell is expected to decline tonight and Tuesday, with marginal advisory level surf expected Tuesday. A new long-period south-southwest swell is expected to arrive Wednesday, which could bring surf near advisory levels again along south facing shores by Wednesday night. A reinforcing south swell arriving Friday will likely keep surf elevated along south facing shores as we head into next weekend.

Surf along remaining shores is expected to remain below advisory levels through the end of the work week. Rough surf along east facing shores will increase slightly during the next few days due to the locally strong trade winds. A moderate north-northwest swell arriving late tonight and Tuesday is expected to peak Tuesday night or Wednesday. This swell will slowly decline Wednesday night. A reinforcing north-northwest swell arriving Thursday will maintain moderate surf along most north and west facing shores through early Saturday. A new north-northwest swell arriving late Saturday will likely cause surf to build along most north and west facing shores from Saturday night through Sunday.

See the latest Collaborative Nearshore Swell and Wind Forecast for Oahu (SRDHFO) for additional details on surf and swells.

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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
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gif Analysis 24 hr 48 hr 72 hr
Pacific Sea Surface
Temperature Analysis

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