Large surf is expected on the east and north shores of the islands this weekend, but the tradewinds and the accompanying tradewind showers will diminish, forecasters said tonight.

A high surf advisory for east-facing shores of Kauai, Oahu, Molokai, Maui and Hawaii island, with 6- to 10-foot faces, has been extended through 6 p.m. Saturday due to a north swell, a National Weather Service lead forecaster said. It was set to expire at 9 a.m. Friday.

The tradewinds will slowly diminish from 15 to 25 mph Thursday down to 10 to 20 mph for the weekend, turning southeasterly Sunday.

The north swell will also bring large but not advisory-level surf of 7 to 10 feet to north shores starting Friday afternoon.