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How much rain have we seen in the past month? Extreme weather to become the norm, says expert

Northland, the Coromandel Peninsula and Bay of Plenty have been in the firing line as storm systems have rolled throughout the country this autumn, and are at risk of being hit again.

We have the numbers and why the affected regions could again be in the firing line as the climate changes. Source: 1 NEWS

Parts of the upper North Island have been saturated after two large storm systems hit in the space of weeks, with Edgecumbe the latest victim of the wild weather. 

Warm, moist air from the Tasman Sea and tropics is to blame for the 'big wet', and, according to one expert, the extreme weather is set to become common place.

"Areas that are open to the north will experience more of these tropical filaments spinning off and dumping more rain," Victoria University climate scientist David Frame said. 

Towns built on flood plains are particularly vulnerable when the land can no longer soak up the water.

Metservice meteorologist Georgina Griffiths said it's been "a really hard month" for the upper North Island. 

She said two month's worth of rain has fallen already in the first week of April. 

NIWA meteorologist Christ Brandolino said in early March, 475 millilitres of rain fell in Whangamata.

"It's a conveyor belt of moisture, simple as that," he said.