High Surf Warning issued December 18 at 3:28PM HST until December 19 at 6:00PM 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…

.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 18 to 25 feet rising
to 20 to 30 feet on Thursday along north facing shores of Kauai,
Niihau, Oahu, Molokai and Maui. Large breaking waves of 12 to 18
feet rising to 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…From 6 AM Wednesday to 6 PM HST Friday. 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.