A cold front is forecast to move north across New Zealand during Monday, while a low develops to the east of the South Island and then moves away to the east late Tuesday.
This front is expected to deliver a cold and showery south to southwest flow across the country, with snow lowering to 200 to 300 metres over the South Island from Monday, and possibly 500 to 600 metres across the lower and central North Island on Tuesday.
Snow is expected to affect many higher roads and farms in these areas, and there is a moderate risk of snow accumulations reaching warning criteria about inland parts of Otago, Canterbury
and Kaikoura during Monday and Tuesday (especially above 400 metres).
Also as the low deepens east of the South Island on Tuesday, it is expected to bring strong southwesterlies and a period of heavy rain to eastern coastal areas of central New Zealand. There is a moderate risk of rainfall accumulations reaching warning criteria and southwesterly gales becoming severe about coastal Canterbury from Banks Peninsula northwards, the Kaikoura Coast and southern
Late Tuesday, another front is forecast to approach the far south of New Zealand, and the west to southwest flow ahead of this front should strengthen. There is moderate confidence of west to southwest gales becoming severe about the south coast of the South Island including Stewart Island, and for northern Wairarapa including the Tararua District, and central Hawkes Bay from later Tuesday and during Wednesday.
During Thursday, a ridge moves onto the country from the Tasman Sea and cold strong west to southwest flow eases. The ridge slowly moves northeast on Friday as another front approaches New Zealand from the Tasman Sea.