High Surf Warning issued December 20 at 3:13AM HST until December 21 at 6:00PM HST by NWS Honolulu HI

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

.A series of large northwest to north-northwest (315-330 degrees)
swells will move through Hawaiian waters through the weekend and
into early next week. Warning level surf is expected to generally
prevail along north and west facing shores through the weekend,
with a brief dip down to advisory levels possible late Saturday
and Saturday night. For the Big Island, advisory level surf is
expected to hold in place through late Saturday afternoon.

* WHAT…Surf building to 25 to 35 feet along north facing shores
and 20 to 25 feet along west facing shores.

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

* WHEN…Until 6 PM HST Saturday.

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