Three dead, 1 missing as rain pounds New Zealand's largest city

Authorities said on Saturday that three people had died and at least one was missing after record levels of rainfall pounded New Zealand's largest city, causing widespread disruption.

Prime Minister Chris Hipkins flew to Auckland on a military plane after a state of emergency was declared in the region.

"Our priority is to ensure that Aucklanders are safe, that they're housed and that they have access to the essential services that they need,” Hipkins said.

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He said the city was in for a big cleanup and that people should remain indoors if possible. He said a break in the weather could prove temporary, with more heavy rain forecast.

"This is an unprecedented event in recent memory," Hipkins said.

Prime Minister Chris Hipkins speaks during a press conference. File photo

Friday was the wettest day ever recorded in Auckland, according to weather agencies, as the amount of rain that would typically fall over the entire summer hit in a single day. On Friday evening, more than 15 centimetres (6 inches) of rain fell in just three hours in some places.

The rain closed highways and poured into homes. Hundreds of people were stranded at Auckland Airport overnight after the airport stopped all flights and parts of the terminal were flooded.

Police said they found one man's body in a flooded culvert and another in a flooded carpark. They said fire and emergency crews found a third body after a landslide brought down a house in the suburb of Remuera. One person remained missing after being swept away by floodwaters, police said.

Hipkins said power had been restored to most places, although about 3,500 homes remained without electricity.

Video posted online showed chest-deep water in some places.

Lawmaker Ricardo Menéndez posted a video of water surging into houses. "We’ve just had to evacuate our home as the water was already rising rapidly and coming in aggressively,” he tweeted.

An area flooded during heavy rainfall in Auckland. Reuters

"We had every available career and volunteer crew on the road responding to the most serious events,” said district manager Brad Mosby.

Mosby said crews had rescued 126 people who were trapped in houses or cars, or who had been involved in vehicle crashes.

Air New Zealand said it resumed domestic flights in and out of Auckland on Saturday afternoon, but wasn't yet sure when international flights would resume.

"The flooding has had a huge impact our Auckland operations," said David Morgan, the airline's chief operational integrity and safety officer. "We’re working on getting customers to their final destinations and getting our crew and aircraft back in the right place. It might take a few days to get everything back on track.”

In a series of updates on Twitter, Auckland Airport said people were able to leave the airport early on Saturday for their homes or accommodation after hundreds spent the night in the terminal.

A portable building rests on a car after floodwaters shifted the structure in Auckland on Saturday. AP

"Unfortunately, due to earlier flooding in the baggage hall, we are currently unable to return checked luggage to you,” the airport wrote. "Your airline will make arrangements for its return at a later time.”

The storm also caused an Elton John concert to be cancelled just before it was due to start on Friday night. A second concert by John that was planned at the stadium on Saturday night was also cancelled.

About 40,000 people were expected to attend each concert at the Mt Smart Stadium. Thousands were already at the venue on Friday night when organisers decided to cancel not long before John was due to take the stage at 7:30pm.

Many concertgoers who had braved the conditions were frustrated the decision hadn't been made hours earlier.

Auckland Mayor Wayne Brown defended criticism that his office did not communicate the seriousness of the situation well and held off on declaring an emergency until about 9:30pm on Friday.

He said the timing of the emergency declaration was guided by experts.

"We will review everything that took place,” Brown said. "We've got to make sure we had the coordination, and the consultation with the public, correct.”