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Marine Weather Message in Effect for the Coastal Waters

Marine section from the Area Forecast Discussion
issued at: Jun 22, 2017 3:30 AM HST

The current long period SSW swell will gradually decrease. However, this swell will be reinforced by another above average south swell, arriving this afternoon, and peaking late tonight or Friday.

In addition to the new southerly swell, tides have been running about a half a foot above predicted levels. These elevated tide levels will increase the risk for minor coastal flooding when combined with the high surf. For the next few afternoons, the predicted high tides are around 2.5 feet, which does not include the extra 1/2 foot mentioned above.

Other wave trains are affecting Hawaii as well, with a small out-of- season northwest swell diminishing today, a small trade wind- generated swell and a short period southeast swell. The southeast swell will continue into the weekend and will add a small component to the wave heights along south facing shores.

In the longer range, models indicate a northeast swell developing for the beginning of next week. This swell will need to be monitored as it interacts with the trade wind swell, and a High Surf Advisory may eventually be needed for east facing shores if the swell comes in bigger than anticipated.

Moderate to occasionally fresh trade winds may diminish slightly over the weekend, with a Small Craft Advisory now in effect through this afternoon for the typically windier zones around Maui and the Big Island.

For more details on the surf, please refer to the Oahu Collaborative Surf Forecast (SRDHFO) prepared by Pat Caldwell under WMO header FXHW52 PHFO.

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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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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.
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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.