WELLINGTON: Cyclone Gabrielle weakened and moved away from New Zealand on Wednesday as the country started to assess the damage caused by significant flooding, landslides and high winds that left three people dead and displaced thousands from their homes.

Gabrielle, which reached New Zealand on Sunday before making its way down the east coast of the North Island, cut off entire towns, washed away farms, bridges and livestock, and inundated homes, stranding people on roof tops.

"We thankfully are through the worst of the storm but we're not out of danger yet," Emergency Management Minister Kieran McAnulty said during a televised media briefing.

"This is a significant disaster and is going to take many weeks for those areas most affected to recover ... we are in this for the long haul."

Residents in hard-hit areas are now being asked to conserve water and food because of fears of shortages after the cyclone forced New Zealand on Tuesday to declare a national state of emergency for only the third time in its history.

Parts of New Zealand's North Island, where about 75% of the country's 5 million residents live, are enduring their second major storm in as many weeks. Record rains last month triggered flash floods and four people lost lives then.

Emergency crews on Wednesday found the body believed to be that of a volunteer firefighter who had been missing since Sunday night following a landslide at a beach community near the country's largest city of Auckland, authorities said.

Two other people have been confirmed dead in Hawke's Bay, a region on the eastern coast of the North Island. Authorities estimate more than 10,000 people have been displaced so far.

Helicopters winched people stuck on rooftops to safety, while military planes will be used to deliver essential supplies to isolated towns, McAnulty said.

EVACUATIONS CONTINUE

Meteorological service WeatherWatch said Cyclone Gabrielle is now east of the country and continuing to track away from the North Island with weather now improving.

Both domestic and international flights have resumed though airline schedules maybe disrupted for several days, Auckland Airport said in a tweet on Wednesday morning.

However, rivers in Hawke's Bay continue to pose risks and the local emergency management ordered further evacuations early on Wednesday. Electricity is out for around 225,000 customers across the island, hampering clean up.

Mother of four Jennie Perris, who lives on a 10-acre (4-hectare) block of land on the outskirts of Whangarei, about 170 km (106 miles) north of Auckland, said the family had been without power since Sunday.

Perris said the roads had cleared on Tuesday and the family had been able to head into the city and shower at her mother's house, charge devices and stock up on bottled water but it was now back to cooking on the barbecue.

"We're doing everything on it," she said.