HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI. . HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF THE BIG ISLAND. . ALL HIGH SURF WARNINGS CANCELLED. .Advisory level surf will persist through tonight and much of Tuesday along exposed north and west facing shores as a significant northwest (310-320 degrees) swell continues to gradually decrease. Heights will drop below advisory levels Tuesday night through Wednesday as the swell moves out. Surf may decrease below advisory level along Big Island shores by Tuesday afternoon, but confidence is low. * WHAT. Surf of 18 to 22 feet tonight and 10 to 15 feet Tuesday for north facing shores of Niihau, Kauai, Oahu, Molokai, and Maui. Surf of 14 to 18 ft tonight and 8 to 12 feet Tuesday for west facing shores of Niihau, Kauai, Oahu, and Molokai. * WHERE. Portions of Kauai, Maui, Molokai, Niihau and Oahu. * WHEN. Until 6 PM HST Tuesday. * IMPACTS. Moderate. Strong breaking waves and strong currents will make swimming dangerous.