Weather warnings for South Island as strong winds, heavy rain forecast

Winds gusting up to 130km/h are set to rattle parts of the South Island on Thursday and heavy rain is in store for other parts.

Strong northwesterlies followed by an active front will move northeast over the South Island today before crossing the North Island on Friday.

MetService said the front would bring downpours for the west of the South Island and heavy rain warnings had been issued.

MetService has issued weather warnings for much of the South Island. Photo / Supplied

Gale-force northwesterlies were expected to rattle southern and eastern areas of the South Island, as well as Wellington and Wairarapa, where strong wind warnings were in force.

Gusts could reach 130km/h in the Canterbury high country, and up to 120km/h in Fiordland, Southland, Stewart Island, Central Otago, Clutha and inland Dunedin.

— MetService (@MetService) August 11, 2021

Forecasters said strong gusts could damage trees, powerlines and unsecured structures and make driving conditions dangerous, especially for motorists in high-side vehicles and motorbikes.

Heavy rain is forecast for parts of the South Island's West Coast, including Buller and Westland, the headwaters of the Canterbury lakes and Fiordland, where weather warnings had been issued.

— NIWA Weather (@NiwaWeather) August 11, 2021

Looking ahead, a second weaker front is expected to move across much of the country on Saturday, followed by a narrow ridge, then a trough for the South Island on Sunday.

A series of active fronts, sitting within a strong northwest flow, will move onto the South Island on Monday.

The fronts are expected to bring periods of heavy rain to the western districts.