MetService warns of heavy rain, severe gales across South Island

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MetService has issued warnings for four areas in the South Island, with up to 400mm of rain forecast over the next two days.

MetService has issued warnings for four areas in the South Island, with up to 400mm of rain forecast over the next two days.

Orange heavy rain warnings are in place for Westland, the Canterbury headwaters, Grey and Buller districts.

The warning for Westland runs from noon Sunday to 1pm Monday, while the Canterbury headwaters warning runs from 2pm Sunday to 2pm Monday.

The ranges of the Grey District could receive 100 to 130mm, while 100 to 150mm is forecast for the Buller ranges.

Peak rainfall rates of up to 40mm an hour are expected about the Westland ranges and Canterbury main divide on Monday morning.

A front moving slowly northwards is the cause, bringing heavy north-westerly rain to the western South Island and the Tararua Range.

Severe northwest gales are also possible about the Canterbury High Country, Wellington and Wairarapa.

The rain may cause streams and rivers to rise rapidly, MetService warns. Surface flooding, slips and difficult driving conditions are also possible.

The strong wind watch for Wellington and Wairarapa runs from noon until 8pm Monday; the Canterbury watch runs from 10pm Sunday to 10am Monday.

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