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Marine Weather Message in Effect for the Coastal Waters

Marine section from the Area Forecast Discussion
issued at: Feb 20, 2017 3:39 AM HST

The Sunday evening ASCAT pass did not find any gales in the Alenuihaha Channel, but did find some areas of 30-32 kt winds, and high-resolution models suggest that winds may increase a bit more today in the typically windy zones around Maui County. Thus the Gale Warning will remain posted through today for the Pailolo and Alenuihaha Channels and Maalaea Bay. Small Craft Advisory conditions will continue for all other waters due to the combination of strong winds and high/rough seas, and the advisory has been extended for those waters through Tuesday. The areas currently in the Gale Warning will need to be added to the advisory as well once the gales end.

In addition to the winds and rough seas, a north-northwest swell will remain near peak levels into this morning, then gradually ease later today through Tuesday. Significant wave heights at the nearshore buoys and at buoy 51101 are running somewhat above the latest wave model guidance. This swell will continue to produce advisory-level surf along north and west facing shores of the smaller islands today. With swell rising well above guidance levels at the Hilo buoy, we have decided to err on the side of caution and add the north facing shores of the Big Island to the high surf advisory for today as well.

Surf along east facing shores will gradually rise through midweek, and may reach advisory levels by Tuesday night or Wednesday.

On Wednesday, a moderate, long-period west-northwest swell associated with a developing gale east of Japan is expected to fill in, peaking late Wednesday through Wednesday night. This swell will gradually ease Thursday, before a reinforcing swell from the same direction, but longer period, builds in late Thursday night and Friday. If this source comes in slightly higher than predicted, advisory-level surf along north and west facing shores will be possible Wednesday and Wednesday night. Advisory-level surf looks more likely with the Friday swell event.

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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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