High Surf Advisory issued December 21 at 3:31PM HST until December 23 at 6:00AM HST by NWS Honolulu HI

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

.An extended period of hazardous surf and beach conditions will
persist through Sunday night along exposed north and west facing
shores due to overlapping, winter-caliber northwest swells
(315-330 degrees). The current swell will be on a slow decline
tonight, but the largest swell in the recent series is expected to
arrive in the predawn hours, rapidly rise and peak through the
day Sunday, and then gradually ease Sunday night and Monday.

* WHAT…Surf of 9 to 15 feet tonight, building to 14 to 18 feet
Sunday.

* WHERE…North facing shores of the Big Island.

* WHEN…Until 6 AM HST Monday.

* IMPACTS…Moderate. Strong breaking waves and strong currents
will make swimming dangerous.