(BIVN) – The National Weather Service issued a High Surf Advisory for north-facing shores of Hawaii Island on Friday. Surf is expected to peak at 10 to 15 feet over night and gradually subside through the weekend.

Hawaii County Civil Defense added that the advisory includes north facing exposures of Puna shorelines.

“Oceanfront residents and beach-goers along affected shores are advised to be on the alert for possible high and dangerous surf,” civil defense stated. “You are asked to exercise caution due to the unpredictability of huge swells and dangerous surf.”

A long period large northwest swell will peak across the Hawaiian waters tonight, forecasters say. Warning level surf will continue along north and west facing shores of most islands through Saturday. The swell will slowly decline through the day Saturday.

North and west facing shores of Niihau, Kauai and Molokai and north facing shores of Oahu and Maui expect waves heights of 25 to 35 feet tonight, dropping to 20 to 25 feet Saturday.