Swell Matrix

Area Forecast Discussion

National Weather Service Honolulu Hi

832 pm hst Tue Oct 13 2026

Synopsis

Moderate trades will gradually build to breezy levels through Thursday as weak troughing around the state dissipates and a new surface high develops north of the state. Expect limited clouds and showers to focus along windward and mauka areas, particularly during the overnight and early morning hours. Slightly wetter trade wind showers will be possible late Friday into the weekend. A drier trade wind pattern may develop early next week.

Aviation

Generally VFR conditions will occur across the state as mainly dry conditions prevail through Wednesday afternoon. Trades will persist through the period. Lighter winds may allow for the development of localized breezes within more trade wind-protected areas. Brief MVFR ceilings will be possible within more organized showers.

No AIRMETs are in effect.

Marine

Issued at 337 PM HST Tue Oct 13 2026

Troughs to the west and east, coupled with the high to the far northeast with an accompanying ridge north of the islands will maintain gentle to moderate trade winds through tomorrow. As the troughs weaken, the pressure gradient will tighten, and trades will strengthen to moderate to locally fresh Thursday. Winds may strengthen to Small Craft Advisory (SCA) levels as early as Wednesday night in some of the typical windier waters near Maui and the Big Island. Winds are then expected to remain at SCA levels through the weekend.

The current long period northwest swell will linger into tomorrow, holding surf near seasonal average for north and west facing shores, before declining Wednesday night through Friday. By late Friday, a medium period north- northwest swell will build and once again help bring surf to near seasonal averages through the weekend.

The current long period south-southwest swell will keep surf along south facing shores elevated through tomorrow. Another long period south swell will help produce surf near seasonal average Thursday into early this weekend.

Surf along east facing shores will remain small through Thursday as small wind waves and tiny east swell persist. Choppy surf will increase slightly as trade winds strengthen across the region Friday into the weekend.

Watches, Warnings, Advisories

None.

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