A large north-northeast swell will bring advisory-level surf to north- and east-facing shores of the Big Island this weekend.
A high surf advisory remains goes into effect at 6 p.m. Friday and will remain posted until 6 a.m. Sunday. National Weather Service forecasters say north-facing shores could see 10- to 15-foot waves Friday evening that will rise to 15- to 20-foot waves Saturday. Wave heights of 4 to 8 feet are forecast for east-facing shores Friday evening that will increase to 6 to 10 feet Saturday.
The service categorized the surf’s impact as “moderate,” cautioning of strong breaking waves, shore break and strong long shore and rip currents that can make swimming dangerous. The surf will also produce moderate harbor surges and large breaking waves at harbor entrances. Mariners should use extreme caution when entering or leaving port, as well as when mooring and launching vessels.