Watch the storm that beared down on Sydney and the state this week

After much of the state was lashed by wild weather overnight, the Bureau of Metereology (BoM) is warning to remain vigilant as ferocious storm cells may return this weekend.

A series of violent storms hit parts of the NSW central west late Thursday afternoon before moving out to Sydney throughout the night.

Large and even giant hail was experienced in parts of Western Sydney and as far north as Newcastle causing damage to property and vehicles.

In Mount Druitt, Western Sydney, unsuspecting shoppers were left shocked as the roof of the Westfield collapsed under the weight of the storm.

The NSW State Emergency Service (SES) on Friday confirmed they had received nearly 700 calls outs across the state, with most congregating around Armidale in the northern tablelands.

Just after 10pm on Thursday, the town felt the force of a tornado which left a radius of destruction of up to four kilometres.

"Most of the damage reported was roofs ripped of house, cars flipped over and a large amount of trees coming down as well," said Greg Swindells, Chief Superintendent of NSW SES.

Up to 4000 homes - or half the town - were left without power in the town on Friday. The New England University campus also had to close for the day following the destruction.

With a separate tornado touching down in Bathurst at the end of September, the Armidale tornado is now the second in as many weeks for the state.

Prior to the Bathurst tornado, it was in 2015 that a tornado last hit the state when it damaged parts of Sydney.

"It's certainly not something we see as common," Chief Superintendent Swindells said.

"It's the start of the storm season and it's given us an indication of what we can expect this year."

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Agata Imielska, the BoM's Hazard Preparedness and Response Manager for NSW/ACT, told media on Friday that intense storms may still be on the horizon for parts of northern NSW and Queensland.

"We have been pretty concerned heading into this storm season with the storm risk and also the flood risk," Ms Imielska said.

"We are going to see more storms, they are most likely in our warmest part of the year and we're not yet in summer.

"We still have a risk of storms [this weekend] if we do get something, it will be localised just as this weather system continues to move east. The main thing to keep an eye out for is those stronger winds."

This story Wild weather 'just the beginning' of storm season first appeared on Newcastle Herald.