Severe weather warnings for blizzard conditions and damaging winds have been issued for a large area of south-eastern Australia.

Extreme conditions had been expected to hit the NSW Snowy Mountains, parts of the South West Slopes and the ACT ranges on Monday night and Tuesday.

Meanwhile, Victoria was bracing for more destructive winds on Tuesday after being battered on Monday.

The Bureau of Meteorology said north-westerly winds had been expected to increase on Monday night, combining with snowfall forecast over the southern ranges.

Forecaster Ewan Mitchell said the weather system was expected to bring cold temperatures over southern and eastern parts of NSW on Tuesday, as well as gusty north-westerly winds.

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"There's a weather warning for blizzard conditions over the alpine areas and higher parts of the adjacent areas of the ACT, Snowy Mountains, South West Slopes and southern ranges," he said.

"The second severe weather warning is for damaging winds and that's for a larger area."

Snow started falling in Thredbo just before 3:00pm on Monday, reducing visibility to about 500 metres.

Thredbo Top Station AWS had reported average wind speeds of between 93 to 110 kilometres per hour, and wind gusts of up to 126 kph between 9:00am and 11:00am on Monday.

Snow had been expected to fall at heights of 1,100 metres on Monday night in the Alpine area, and at 700-900 metres over the southern ranges on Tuesday morning, before lifting again during the day.

"That will see fairly extensive snowfalls across the south-east of New South Wales overnight (Monday)," Mr Mitchell said.

Wind speeds in blizzards were forecast to increase to 60-80kph, with gusts of 90-110kph.

On the alpine peaks winds may reach 90-110kph with gusts to 130 kph.

Damaging winds of around 60-80 kph with peak gusts of 90-110 kph are also forecast for the Metropolitan, Illawarra and Southern Tablelands and parts of the Hunter, South Coast, South West Slopes, Snowy Mountains and ACT.

In Victoria winds as strong as 95kph were recorded in Port Phillip on Monday night and falling trees caused damage around the Melbourne metropolitan area.

Alpine areas were expecting gusts of 125kpm on Monday night and plenty of snow, which may also dust the Dandenong and Macedon ranges.

Commuters have been warned to take extra care on Tuesday morning with winds of around 90kph expected along Victoria's western and central coast.