What you need to know

• A tornado swept through the Northland township of Mangawhai about 3am on Sunday morning
• Two people were taken to hospital in a serious condition
• At least 50 homes were damaged
• Around 150 properties on Moir Street and Old Waipu Road remain without power on Monday

Northland MP Grant McCallum is promising the Government will do whatever it can to support the people of Mangawhai.

He told Morning Report he is feeding through information to acting Emergency Management and Recovery Minister Simeon Brown while Mark Mitchell is overseas.

In regards to the stickered properties, he encouraged owners to contact their insurance provider first thing on Monday morning.

"Please get in touch with the insurance companies and talk to them before you start ripping into tidying up things, because they might need to come and make assessments and things like that."

McCallum said the Kaipara District Council will carry the cost of clearing away debris.

"In the affected areas, if people put all the rubbish and all the damaged things on their berms outside their houses, the council will coordinate them being picked up and will be at no charge."

Photo credit: RNZ / Finn Blackwell

It could take months for storm damage in Mangawhai to be fully repaired after a devastating tornado, Kaipara Civil Defence expects.

At least 50 homes were damaged, and trees and about 20 power poles downed, when the storm ripped through the Northland township about 3am on Sunday, leaving roads covered in debris.Multiple houses had roofs torn off and a few homes and a business were destroyed.

Nick Berthoud, owner of a house on Old Waipu Road, said he had only lived in it for one year before it was destroyed in the storm.

"Two years to build, been one year in it and now this," Nick Berthoud told RNZ. "Yeah, a bit devastating.

So far, three properties have been yellow stickered - restricting entry - and another has been white-stickered, meaning it's damaged but people can go inside.