Swell Matrix

Area Forecast Discussion

National Weather Service Honolulu Hi

911 am hst Mon may 11 2026

Synopsis

Breezy trade winds will continue through the week. Showers will favor windward and mauka areas, most frequently at night and during the early morning hours. An upper level disturbance may bring a slight uptick in trade wind shower coverage late this week into the weekend.

Aviation

Issued at 911 AM HST Mon May 11 2026

Stable trade wind weather is expected today, with trades increasing a bit more to breezy levels by the afternoon. Isolated to scattered showers will continue to ride in with the trade winds, especially over Kauai. Showers will be most prevalent in the overnight through morning periods, which could produce brief MVFR conditions. Otherwise VFR conditions should prevail at area terminals. AIRMET Sierra remains in effect for north through east sections of Kauai due to some lingering moisture in the area.

AIRMET Tango is also in effect for low-level turbulence downwind of island terrain. This AIRMET will likely be needed through the next several days.

Marine

Issued at 306 AM HST Mon May 11 2026

High pressure remains in place north of the Hawaiian Islands this week in maintenance of fresh to locally strong trades continuing into next weekend. The Small Craft Advisory remains in effect.

A small medium period NW swell maintains small surf along N and W shores today. Another small long period NW swell arrives Wednesday afternoon and peaks early Thursday.

Two additional small long period S swells arrive today and on Thursday keeping surf heights along S facing shores above flat levels. Surf along E shores remains below normal in the near term, with increasing surf peaking by Wednesday as trade winds strengthen.

Watches, Warnings, Advisories

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

Visit this site often? Consider supporting us with a $10 contribution.
Learn more