Remnants of Cyclone Debbie forecast to bring further downpours across country after the weekend

A month's worth of rain is expected to fall over New Zealand in one day next week as the remnants of Cyclone Debbie makes its way across the Tasman.

This weekend is spared the bad weather but come Monday the North Island and the upper South Island will be soaked - with a high risk of the same flooding seen in March.

Strong winds and rain from Cyclone Debbie lash Airlie Beach on Tuesday. Photo / Dan Peled

Cyclone Debbie brought devastation to Queensland with thousands evacuated, crops decimated and schools closed.

Phillip Duncan from WeatherWatch said the impact of Debbie on New Zealand would be more subdued, but still wet.

Duncan said a cold front would mix with the remnants of Debbie and bring heavy rain from Sunday.

"It's not too bad this weekend but next week is when the ex-cyclone will merge with other weather makers and produce some pretty big tropical rains for a time."

It's likely to be a case of "here we go again" with wet weather expected to hit Sunday and continue into the week.

Head Weather Analyst Philip Duncan, of weatherwatch.co.nz. Photo / Janna Dixon

"From Monday night until further into next week there are going to be downpours like March," he said.

"I would expect a month's worth of rain in one or two days."

Earlier this month Auckland was hit by flash-floods with the west Auckland suburb of New Lynn hit hard.

Houses were flooded, families evacuated and a large sinkhole appeared, where part of the footpath fell away and left a sheer drop underground.

Duncan couldn't say what areas would be affected most by flooding this time because the weather pattern was unpredictable.

"When lows connect with tropics you never know what you are going to get - next week is going to be an interesting week.

"But expect rain and flooding."

The low was also expected to bring cooler weather to Southland and Otago on Sunday but on Monday that will end with more humid temperatures expected.

Cyclone Debbie brought such wild weather a dead bull shark washed up in floodwaters on a road south of Townsville.

Emergency services used the shark to warn of the dangers of floodwater.

"Think it's safe to go back in the water? Think again," it said.

"You never know what lurks beneath the surface during a severe storm and what will wash up in the aftermath."

A bull shark washed up near Townsville after cyclone Debbie swept through Queensland. Photo / via Twitter

Tales of the devastation were recorded on social media under the hashtag #Bigwet.