Medical supplies have been picked up in Nelson and flown to Golden Bay in the helicopter that's taking two cabinet ministers around parts of the upper South Island hit by former cyclone Gita.
In New Zealand's South Island, about 200 tourists were still trapped after spending the night in their buses or in welfare centres, Radio NZ reported.
"The full impact of the storm will be felt overnight and tomorrow morning", said Christchurch Mayor Lianne Dalziel.
We hope everyone in Gita-affected areas continues to stay safe and our thoughts are with those who needed to be evacuated or suffered damage to their homes or communities.
Ahead of the storm, the military was deployed to towns expected to be hardest hit.
Cyclone Gita hit the Pacific island nations of Fiji and Tonga last week, packing winds up to 275 km/h.
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Tropical Cyclone Gita passed through the Kingdom of Tonga just 40 km from the capital city of Nuku'alofa as a Category 4 cyclone, with winds up to 200 km per hour.
A state of emergency has been declared in seven provinces including Taranaki, Nelson Tasman, Westland and Christchurch.
The storm damaged buildings and left thousands without power and roads are still closed as the fix efforts starts.
The cyclone had since been downgraded to a storm, but forecasters said it was still likely to wreak havoc on Tuesday evening as it traversed the centre of New Zealand.
National carrier Air New Zealand had cancelled several flights from Wellington since Tuesday afternoon and was working through the backlog on Wednesday.