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Watch the moment a roof collapses inside a Toormina shopping centre during storm

Parts of Queensland and the NSW north coast are bracing for another day of heavy rainfall and storm activity following this week's record-breaking wild weather.

Emergency warnings have been downgraded around Mackay and the Bowen region after the past two days delivered powerful conditions.

A potential tornado warning for Darling Downs, north of Toowoomba and other parts of southern Queensland has also been downgraded.

LIKE SNOW: A thick blanket of hail fell across parts of the mid north coast, including Toormina and Coffs Harbour. Picture: NSW Incident Alerts

LIKE SNOW: A thick blanket of hail fell across parts of the mid north coast, including Toormina and Coffs Harbour. Picture: NSW Incident Alerts

Tennis ball sized hail measuring 16cm fell near Mackay, breaking the previously set Australian record by two centimetres. The previous record was set last October in south-east Queensland.

It is still a farcry from the world's record though, which was set in South Dakota in July 2010 when 20.3cm hail fell over parts of the city.

Meanwhile in Toormina near Coffs Harbour on the NSW North Coast on Wednesday, the growing storm cell brought down the roof of a shopping centre.

It follows weeks of storm activity across parts of NSW, ACT and Victoria, including several damaging tornadoes.

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This story Shopping centre roof collapses under weight of powerful storm cell first appeared on Port Macquarie News.