...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... A moderate to large, medium period NNW (350 degree) swell will fill in through the day and peak this afternoon before slowly declining Friday. * WHAT...Surf building to 14 to 18 feet late this afternoon along north facing shores and 8 to 12 feet along west facing shores. * WHERE...North and west facing shores of Molokai, and north facing shores of Maui. * WHEN...From 6 AM Thursday to 6 AM HST Friday. * IMPACTS...Moderate. Strong breaking waves and strong currents will make swimming dangerous.