A rare weather event could bring another bitterly cold blast to New Zealand.
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When temperatures over the South Pole climb by more than 25 C, it kicks off a "sudden stratospheric warning".
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Meteorologists think it will happen next week.
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NIWA forecaster Ben Noll told Simon and Phil the warming can allow cold stormy air to escape the pole.
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He says there's a lot of ocean in the Southern Hemisphere - so it doesn't mean New Zealand will feel the worst of it.
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