Swell Matrix

Area Forecast Discussion

National Weather Service Honolulu Hi

811 pm hst Wed apr 1 2026

Synopsis

Partly cloudy skies with lower humidity under breezy trades will continue the next several days. Limited shower activity will be confined to primarily windward zones and mauka slopes. Long range model guidance are coming more in line with the evolution of a deepening trough northwest of the state mid next week. This trough will pull up a more mositure-rich southern air mass and likely be the impetus to higher statewide precipitation.

Aviation

Issued at 752 PM HST Wed Apr 1 2026

Moderate to locally breezy ENE trades persist through the period, anticipated to gradually weaken through the remainder of the week. Embedded isolated trade showers continue, predominately across windward and mauka areas, which may lower ceilings and visibility to MVFR at times. Otherwise, VFR conditions will prevail.

No AIRMETs are currently in effect.

Marine

Issued at 752 PM HST Wed Apr 1 2026

Weakening high pressure north of the islands will shift eastward over the next few days, leading to a weakening of the trade winds into the moderate range. Winds could then veer out of the southeast next week ahead of an approaching front. A Small Craft Advisory is in effect for the typically windier waters around Maui County and the Big Island through Thursday night.

The current mid period northeast swell (7 ft, 9-11 seconds at 040 degrees) will gradually decrease tomorrow as the northeast trade winds slowly decrease. As a result, east shore surf will gradually decline tomorrow through the rest of the week, but will still retain a little size and chop due to the moderate to locally breezy trades.

The next small, medium-period northwest (310 degree) swell will arrive this weekend into next week and bring a small bump in surf for north and west facing shores. Along south facing shores, expect small reinforcements to sustain small surf through the week until a slightly larger long period south swell fills in early next week.

Watches, Warnings, Advisories

Small Craft Advisory until 6 AM HST Friday for Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters- Maalaea Bay-Pailolo Channel.

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