Residents of south-eastern Australia were treated to a dramatic and rare celestial display overnight as the unusual combination a massive cold front collided with summery storm conditions to create "thundersnow".

The seldom-seen phenomenon was caused by the Arctic vortex butting into a body of warm, humid air, according to Weatherzone forecaster Rob Sharpe.

Filmed by weather-watcher @BlackheathWx in the Blue Mountains, footage of the thundersnow shows the sky lighting up as a result of one storm while the second dumps flakes on the lawn.

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"Thunderstorms are generally limited to the warmer times of year because they rely on sharp contrasts in temperature and significant wind shear, and we saw both of those set-ups last night," Mr Sharpe told ninemsn.

"We had a very strong cold front move through and because there was some warm, humid air ahead of the front and some very dry cold air behind the front, the interaction of those air masses and the strong winds meant that we had some thunderstorms move along the ranges."

There has been snowfall in NSW and Victoria as temperatures plummet across the states today, but predictions of snow in Queensland appear to have been premature, though there is still a chance the sunshine state could see a dump before the week is out.

"There is a slight chance of some sleet or snow flurries over the higher terrain of the far southeast and Granite Belt," the Bureau of Meteorology predicted.

One feature of the Antarctic vortex is just how quickly it can change weather conditions, as evidenced by dashcam footage taken by motorist Raymond Lucas while he drove along the Hume Highway near Barnawartha in Victoria yesterday.

The video which was posted online overnight, shows a beautiful blue sky quickly wiped out by storm clouds – in less than two minutes, Mr Lucas is driving along a blanket of hail thick enough to resemble snow.

IN PICTURES: Skiers and snowmen in Queensland as Antarctic Blast brings more snow to Australia View Gallery

The low pressure system is expected to keep temperatures in the south-east extremely cool - in some areas below freezing – for most of the week.

In addition to the thundersnow, parts of New South Wales saw gale force winds overnight, with up to 50 cm of snow expected in skiing areas, and five to 15 cm forecast in the Blue Mountains and Central Tablelands.