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Observed at 20:00, Tuesday 1 April BBC Weather in association with MeteoGroup, external All times are New Zealand Daylight Time (Pacific/Auckland, GMT+13) unless otherwise stated.

But an even more devastating catastrophe could happen at one of New Zealand's most iconic tourist destinations, Piopiotahi/Milford Sound. And it is unclear how this disaster can be prevented.

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Snaking along the edges of New Zealand's longest lake ... by The Helicopter Line and is subject to weather conditions. Other things to do in Milford Sound include hiking, kayaking, sailing ...