High Surf Warning issued December 19 at 3:27PM HST until December 21 at 6:00AM HST by NWS Honolulu HI

…HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF KAUAI
NIIHAU OAHU AND MOLOKAI AND FOR NORTH FACING SHORES OF MAUI…
…HIGH SURF ADVISORY FOR WEST FACING SHORES OF THE BIG ISLAND…

.A series of large northwest to north-northwest (315-330 degrees)
swells will move through Hawaiian waters into Monday. The
overlapping pulses of swell will likely maintain surf near or
above warning thresholds along affected shores most of the time
through at least the weekend, with the largest swell expected on
Sunday. Advisory level surf will be possible along west facing
shores of the Big Island.

* WHAT…Dangerously large breaking waves of 25 to 35 feet along
north facing shores of Kauai, Niihau, Oahu, Molokai and Maui.
Large breaking waves of 15 to 20 feet along west facing shores
of Kauai, Niihau, Oahu, and Molokai.

* WHERE…North and west facing shores of Kauai, Niihau, Oahu,
and Molokai, and north facing shores of Maui.

* WHEN…Until 6 AM HST Saturday. This warning will likely be
extended through the weekend.

* IMPACTS…High. Expect very strong breaking waves and powerful
currents. Waves breaking in channel entrances may make
navigating the channels dangerous.