The State Emergency Service (SES) says storms in northern New South Wales have destroyed at least one house and a dozen others have been severely damaged.
The village of Woodburn, south of Ballina, was hardest hit when the storm hit about 7pm AEDT last night.
The wild weather also caused .
The village of Woodburn, south of Ballina, was hardest hit when the storm hit about 7:00pm AEDT last night.
In NSW, the SES has received at least 90 calls for help across the state's north.
It has been advised that power for about 2,000 properties could be out for up to 48 hours because major power lines have come down.
SES acting region controller Kaylene Jones says strong winds and hail wrought havoc.
"There are between 12 and 14 houses that we're aware of at this point in time that have substantial structural damage," she said.
"So that's either entire rooves have been taken off, some walls are blown out and damaged and so on.
"Those houses are quite uninhabitable. There is one house that's completely collapsed."
Authorities predict it could take several days to clean up after the severe storm.
Woodburn resident Stewart Rofe was in his house when it was destroyed by the storm.
"I was watching this storm come over and I said to the family, 'we're going to get a nasty one' - and it just got worse and worse and then the hail happened," he said.
"I can't believe it. The roof's two doors over, brand new roof...in a tree. Missed the house next door...House is gutted all the way through."
Another resident, Alison Smith, whose house was severely damaged, says it is lucky her family was out when the storm struck.
"I'd hate to think, my two girls and my husband, would have been probably severely injured. It basically tore our whole our whole roof off our house and debris everywhere. Yeah, nothing left inside our house, everything is gone," she said.
© ABC 2012
08:28 EST The SES Commissioner says an 'after action' review will be undertaken by the organisation into its response to last month's deadly floods in Dungog.