Surf along the north-facing shores of O'ahu is expected to reach 6 to 10 feet today, but much bigger waves are due in on Wednesday, the National Weather Service said.

A new northwest swell will arrive on Wednesday and build quickly overnight, forecasters said. The swell will peak Thursday with surf along north-facing shores likely exceeding the advisory level of 15 feet.

Elsewhere today, look for surf of 4 to 6 feet along east- and west-facing shores, and 3 to 5 feet along south-facing shores with a few locally higher sets up to 6 feet.