A high surf warning for the north and west shores of isles stretching from Niihau to Maui has been extended to 6 a.m. Friday.
The National Weather Service has also issued a high surf advisory for the South Kona coast of Hawaii island, effective through 6 p.m. today.
Warning level surf is expected along most north and west shores from Kauai County to Maui as a large, northwest swell peaks this morning. Surf will be 25 to 35 feet today along north and west shores of Kauai County, and north shores of Oahu, Molokai and Maui. It is expected to lower to 20 to 30 feet tonight.
Surf along west shores of Oahu and Molokai is expected to rise to 15 to 25 feet today and lower to 14 to 20 feet tonight.
In the South Kona district of Hawaii island, surf is expected to rise to advisory levels of 6 to 10 feet today.
Additionally, low-lying coastlines and coastal roadways exposed to the swell may experience wave runup and overwash due to early morning high tides, weather officials said. Tide gauges are showing water levels near six-tenth of a foot higher than predicted.
On Maui, county officials have closed Baldwin Beach Park until further notice due to flooding from high surf.
Officials warn that ocean water may occasionally sweep across portions of beaches, the presence of very strong, breaking waves, and longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous.
Anyone entering the water could face significant injury or death.
The swell is expected to slowly subside through Saturday, Tradewinds, meanwhile, are expected to increase tonight and Friday, bringing passing showers to windward areas. A front stalling to the northwest is expected to bring more rain to Kauai over the next few days.
A gale warning has also been issued for offshore waters beyond 40 nautical miles to 240 nautical miles, including the area east of French Frigate Shoals at Papahanaumokuakea Marine National Monument.