National Weather Service (NWS) meteorologists are warning that dangerous surf along Hawaii’s north- and west-facing shores will be strong enough to potentially cause road closures near the affected shores.

Why It Matters

Hawaii is a popular destination, and the NWS Honolulu office is warning tourists and residents alike to stay away from the shoreline along the north- and west-facing shores of Niihau, Kauai, Oahu, Molokai and the north-facing shores of Maui. Surf as high as 35 feet is likely to surge and sweep across beaches, coastal benches and lava flows, impacting coastal properties and even infrastructure and roadways.

What To Know

A high surf warning was issued early Friday morning and will remain in place until Saturday morning.

The strong waves are caused by a large northwest swell that is expected to peak Friday afternoon and evening. In addition to the high surf, the swell will cause “powerful longshore and rip currents” at most beaches.

Harbor entrances could be impacted by large breaking waves and strong currents, the high-surf warning said, and channels also could be impacted, leading to challenging boat handling.

Surf will be highest for north-facing shores at 25 to 25 feet. West-facing shores are expecting surf of 18 to 22 feet.

The swell is originating from the northwest Pacific Ocean between Hawaii and Japan. Swells are normal for the Aloha State this time of year, but the typical surf size is 18 feet, making the ongoing surf higher than normal.

A small craft advisory is also in place, warning boaters that sea conditions could be hazardous to small craft.

What People Are Saying

NWS meteorologist Derek Wroe told Newsweek: “There are some areas that are more vulnerable than others. Certain areas that the beach is a bit lower. If there’s a road that’s close to it, sometimes waves will surge, run up the beach and push onto the road. It’s not very unusual for us to get surf of this size in January.”

NWS Honolulu, in a high-surf warning: “Stay away from the shoreline along the affected coasts. Be prepared for road closures. Postpone entering or leaving channels affected by the high surf until the surf subsides.”

What Happens Next

The high-surf warning is expected to expire by 6 a.m. local time Saturday morning.

In addition to the high surf, rain showers are expected on Friday as a cold front pushes down the island chain, according to the NWS Honolulu forecast. Another cold front is expected by the middle of next week, increasing the chance of rain and thunderstorms.

Wroe said there are no significant swells on the horizon that could prompt a high surf warning in the coming week.