Surfers will have their pick of waves Tuesday as a rising northwest swell and a declining south swell will bring waves of up to 8 feet to south and west shores and 8 to 12 feet on north shores.

But National Weather Service forecasters warn the high surf can be hazardous, creating strong currents that can make swimming difficult and dangerous.

The National Weather Service extended the high surf advisory for south shores of all islands until 6 p.m. Tuesday.  The waves are slowly declining but will remain above advisory levels, forecasters say.

Even as the south swell declines, an out-of-season northwest swell  is bringing waves to north and west shores.

The long-running south swell has been generating advisory-level surf since Thursday afternoon. Forecasters say even though the swell is declining, it should still keep moderate surf in the forecast through the end of the week.

The northwest swell should peak Tuesday and gradually subside Friday into Saturday.