UPDATE: Sunday, 7:25 p.m.

The National Weather Service has extended the high surf warning for north and west shores of Niihau, Kauai, Oahu and Molokai, and north shores of Maui.

Surf will range from 20 to 25 feet early tonight and then lower into the 15- to 20-foot range by Monday morning.

Surf for the west shores of the Big Island should remain at advisory levels.

Both warnings are in effect until 6 p.m. Tuesday.

3:35 p.m.

The National Weather Service has extended the high surf warning for north and west shores of Niihau, Kauai, Oahu and Molokai, and north shores of Maui.

Surf is expected to reach 20 to 30 feet tonight and build to 20 to 25 feet on Sunday.

A separate updated warning for west shores of the Big Island forecasts large breaking waves of 7 to 10 feet tonight and 8 to 12 feet on Sunday.

Both warnings are in effect until 6 p.m. Sunday.

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A large northwest swell has prompted a high surf warning for north- and west shores of isles from Niihau to Maui through Sunday morning, and a high surf advisory for west shores of Hawaii island starting this evening.

The National Weather Service today issued a high surf warning for north and west shores of Niihau, Kauai, Oahu and Molokai, and north shores of Maui, effective until 6 a.m. Sunday.

North and west shores of Molokai and north shores of Maui are expected to see surf reach 18 to 25 feet later today, building to 20 to 30 feet tonight. Dangerously large breaking waves of 20 to 30 feet are forecast for Kauai, Oahu, and Niihau later today and tonight.

The swell will create hazardous conditions, with large, breaking surf joining significant shorebreak and dangerous currents to make entering the water very hazardous. Anyone entering the water could face significant injury or death, forecasters said.

On the Big Island, a high surf advisory is in effect starting at 6 p.m., with surf of 7 to 10 feet hitting west shores. The advisory is set to run until 6 a.m. Sunday.