| Hang loose and, uh, hang two. |
The National Weather Service surf forecast is calling for surf along north and west shores to rise to 30 to 40 feet by daybreak on Kaua'i and to hit 30 to 35 feet on O'ahu's North Shore by this afternoon.
Surf will be slightly smaller on Molokai and Maui.
The high surf is being generated by a large northwest swell generated by a passing storm north of the islands a couple of days ago.
A high surf warning means that coastal residents need to make preparations to protect life and property from large waves that could result in coastal flooding.
Surf heights are forecast heights of the face or front of waves. The surf forecast is based on the significant wave height in the zone of maximum refraction. Some waves may be more than twice as high as the significant wave height. Expect to encounter rip currents in or near any surf zone.