Dangerous waves set to hit entire west coast of New Zealand

Dangerous waves are set to hit New Zealand's western coastline on New Year's Day and they may be so high fishers and boaties could be in peril.

Beachgoers are being warned to expect increasing large and powerful swells that will rapidly double in height at North and South Island beaches throughout the day.

Metservice said the dangerous swells will suddenly arrive in sets with the potential to catch those near the water by surprise.

Fishing off rocks and crossing West Coast bars by boat may prove too hazardous for the next couple of days.

Dangerous swells arriving for New Year's Day. Swell is expected to rise on west coast beaches during New Year's Day, which could take beach users by surprise. Swell is driven by a large and persistent belt of westerly gales south of Australia. ^TA pic.twitter.com/1NcXPnVqNm

— MetService (@MetService) December 30, 2017

MetService said the waves had been generated from a deep storm in the Southern Ocean and driven by westerly gales roaring across the ocean south of Australia.

The long period waves would begin arriving in New Zealand waters on New Year's Day before rapidly getting larger.

MetService said if you were planning a west coast beach mission it would best to go to a patrolled beach.

🏄‍♀️🌊Swells on its way🌊🏄‍♂️
Gales south of Aus generating a pulse of swell. Waves may not appear large at first but will rise through tomorrow. As winds are far away, longest wavelengths arrive first. Wave energy proportional to wavelength, so are also powerful. ^TA pic.twitter.com/Wq0oou9vD1

— MetService (@MetService) December 30, 2017

Meanwhile the New Year is expected to be ushered in on a fine note for northern and eastern regions but wet in the west.

A front bringing wet weather is expected to stall over the South Island, keeping temperatures balmy in the north.