(BIVN) – The National Weather Service in Honolulu has issued a High Surf Warning for Hawaiʻi Island, which is in effect until 6 a.m. HST Thursday. Hawaiʻi County Civil Defense is reporting closures in East Hawaiʻi.

The Hilo Bayfront Highway is closed in both directions due to crashing waves throwing rocks and debris onto the road.

The Laupahoehoe Boat Ramp is also closed.

Surf heights of 12 to 16 feet are expected along the east-facing shores of the Big Island. Surf could reach 15 to 20 feet along north facing shores. The large, north northeast swell is forecast to build this morning, peak in the afternoon and evening, then decline on Thursday.

“Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong longshore and rip currents,” the National Weather Service said. “Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous.”

A Marine Weather Statement has also been issued, warning that there is “the potential for surges in north facing harbors, including Hilo and Kahului Harbors. Mariners using these harbors should exercise caution when entering or leaving port and when mooring or launching vessels.”