that translates to 50+ feet on the north shore around 7 p.m. north shore beaches on thursday saw 30 to 40 foot faces , west shores 15 to 25 feet and west shores of the big island 10 to 15 feet.currently a high surf warning is in effect until 6 a.m. saturday for the north and west shores of niihau , kauai , oahu and molokai , the north shore of maui .