Strong surf of at least 20 feet forecast for 5 islands’ shores

The powerful northwest swell that produced giant waves over the weekend continues to generate high surf along the north and west shores of several islands.

The National Weather Service issued a high-surf warning, effective through 6 p.m. Tuesday, for the north and west shores of Oahu, Kauai, Molo­kai and Nii­hau, and the north shore of Maui.

Forecasters predict surf of 21 to 28 feet along the north and west shores of Kauai and Nii­hau, and the north shores of Oahu, Maui and Molo­kai. Surf as high as 22 feet could hit the west shores of Oahu and Molo­kai by early Tuesday morning.

Oceangoers are warned to expect very strong breakers, high wave run-ups and strong longshore and rip currents. Breaking waves may occasionally enter harbors, making navigating the channels dangerous, according to the weather service.

The agency warned that anyone entering the ocean could face injury or death from significant shorebreak and dangerous currents. Boaters are also advised to be aware of an increased number of surfers using harbor channels to access surf spots.

Meanwhile, a high-wind warning was in effect for Hawaii island summits until 6 a.m. Tuesday.

Winds are expected to reach 55 to 65 mph, with localized gusts of more than 80 mph, in summit areas above 8,000 feet.

The weather service advises people to delay travel to the summits until the winds subside.

A small-craft advisory is also in effect until 4 p.m. Wednesday for Hawaii waters within 40 nautical miles, including the Hawaiian Islands Humpback Whale National Marine Sanctuary.

High pressure building in the northwest is expected to result in cool, clear weather over the next two days.

Southerly winds will return by Thursday as another front approaches from the west, the weather service reported.

The front is forecast to pass over the island chain by Friday evening. High pressure behind the front will bring cool northerly winds that will last through the weekend, according to forecasters.