The National Weather Service has issued a high surf warning through tomorrow for O'ahu's North Shore. The weather service predicts wave faces of up to 25 feet will continue through both days due to a new northwest swell arriving tonight.

Forecaster Norman Hui urged people traveling to the North Shore to see the area's famous big waves to avoid going into the ocean, and even to keep a distance from the shoreline.

"Don't get too close to the coast," he said. "A rogue wave could come in and get you. And it always helps to check with a lifeguard."

Otherwise, Hui said, trade winds are expected to come in from the east at around 15 mph, providing excellent surfing conditions for those with the experience and qualifications to ride the mammoth waves.

He said the surf will slowly decline over the weekend.