Swell Matrix

Area Forecast Discussion

National Weather Service Honolulu Hi

830 pm hst Sat Nov 14 2026

Synopsis

Surface high pressure northwest of the Hawaiian Islands will slowly slide east over the next several days. Passing showers are possible over windward and mountain areas during this time period, mainly during the overnight to early morning hours. The next best chance for statewide rainfall should arrive Tuesday and Wednesday as increased low level moisture arrives with the unsettled cloud remnants of a dissipated front drifting into the region from the north. A passing weak upper level disturbance and low level cloud band drifting into the islands next week may extend this period of enhanced trade wind shower activity lasting into next weekend.

Aviation

Issued at 310 PM HST Sat Nov 14 2026 Breezy trade winds will continue into Sunday with brief periods of showers over windward and mountain areas, spilling into leeward areas at times.

AIRMET Sierra is in effect for mountain obscurations over north and east sections of Kauai, Oahu, Molokai, and Maui. Low clouds and scattered windward showers will maintain obscured terrain in this area.

AIRMET Tango remains in effect for low level moderate turbulence over and downwind of island mountains.

Marine

Issued at 310 PM HST Sat Nov 14 2026 Fresh to locally strong trade winds will increase tonight as a strong 1034 mb high builds far north of the islands. The Small Craft Advisory (SCA) has been expanded to all waters to account for the strengthening trades. Winds will diminish gradually late Sunday and Monday as the high moves to the northeast, but a new north swell will push combined seas above 10 feet for exposed waters, likely prompting an extension of the SCA for most zones. Expect moderate to locally strong trade winds to require a SCA for the typically windy waters Tuesday through the remainder of the week.

A small north-northwest swell will hold through tonight, followed by a moderate, long-period north swell building on Sunday. The north swell (350 to 010 degrees) will produce surf near High Surf Advisory thresholds along north-facing shores, as well as some exposed eastern shores, on Sunday afternoon into Monday morning, and a Marine Weather Statement has been issued to highlight surges in north-facing harbors, mainly at Kahului and Hilo Harbors. The north swell will gradually decline late Monday through Wednesday. A tiny pulse of northwest swell will be possible late next week, followed a moderate swell next weekend.

Rough surf along east-facing shores will remain above seasonal average over the next couple of days due to elevated trade wind swell and some wrapping north swell. East shore surf is expected to be around seasonal average Tuesday through the rest of the week. Mainly small background level surf will persist along south- facing shores through much of the week, though a small long-period swell will be possible on Friday.

Watches, Warnings, Advisories

Small Craft Advisory until 6 PM HST Sunday for Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters- Big Island Windward Waters-Kaiwi Channel-Kauai Channel-Kauai Leeward Waters-Kauai Northwest Waters-Kauai Windward Waters- Maalaea Bay-Maui County Leeward Waters-Maui County Windward Waters-Oahu Leeward Waters-Oahu Windward Waters-Pailolo Channel.

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