...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND NORTH FACING SHORES OF MAUI... .The northwest swell is beginning to fall as surf lowers to below advisory levels by Saturday morning. ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 AM HST SATURDAY... * WHAT...Surf up to 15 feet tonight along exposed north facing shores with a steady decline through early Saturday. Surf up to 12 feet tonight along exposed west facing shores with a steady decline through early Saturday. * WHERE...North and west facing shores of Niihau, Kauai, Oahu and Molokai, and north facing shores of Maui. * WHEN...Until 6 AM HST Saturday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous.