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Dunedin and parts of Otago are in line for some heavy rain and snow as a low bears down on the South.
MetService says a complex trough is expected to move on to the South Island tonight, while a low deepens east of the country tomorrow.
Cold south to southeasterlies are expected to spread over the South overnight, then move northwards late tomorrow or Tuesday. Snow is expected to 200 metres about eastern parts of Otago, and Canterbury, and ''significant accumulations'' are possible about the mountains and high country.
MetService warns of snow on the alpine passes and Dunedin's northern motorway from tomorrow afternoon.
In a severe weather watch this morning, the forecaster says snowfall accumulations could approach warning criteria above 400 metres about Dunedin, North Otago, Central Otago, and the Canterbury high country.
Below the snowfall level, rainfall accumulations could approach local warning criteria (40 to 50mm in 12h) about Dunedin and North Otago from tomorrow afternoon.