A severe weather warning has been issued for south-east NSW, with a cold front forecast to bring heavy rain, large hail, damaging winds and possible flooding.

Thunderstorms were expected across large parts of the state on Thursday, with more severe storms possible in the north and southern inland areas, the Bureau of Meteorology said.

Those storms could bring large hail, heavy rainfall and damaging winds later on Thursday.

It comes as much of Australia’s south-east – including Victoria, Tasmania, the ACT and South Australia – faced another day of damaging winds and dangerous surf, with conditions expected to worsen.

It is the latest in several days of wild weather in Victoria, southern NSW, the ACT and Tasmania.

The weather bureau warned that isolated major flooding was possible in southern NSW, northern Tasmania and north-east Victoria, while minor to moderate flooding was possible elsewhere.

Alpine regions are predicted to be hit hardest, with gale-force winds and thunderstorms on Thursday.

In NSW, heavy rain may lead to flash flooding in the Illawarra, southern tablelands, the Hunter, south coast, central tablelands, north-west slopes and plains, central-west slopes and plains, south-west slopes, Snowy Mountains, and Riverina regions.

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NSW SES superintendent Barry Griffiths said volunteers at Wagga Wagga were preparing for riverine flooding of the Murrumbidgee River around Tumut and Gundagai.

“We have mobilised two high-clearance vehicles, a fixed-wing and been engaged with the local government agencies in those affected areas since Monday,” he said on the Nine Network.

Early on Thursday, there were thunderstorms across much of inland NSW and the southern ranges, with the “unsettled weather due to complex low moving east across the Bight”, BoM reported.

“Thunderstorms are possible for much of the state. Severe thunderstorms are possible in the northern and southern inland regions of NSW, with the potential to bring damaging winds, large hail and heavy rainfall on Thursday afternoon and evening,” it said.

The Snowy Mountains and the south-western slopes could cop six-hourly rainfall totals of up to 60 millimetres on Thursday, with localised falls of up to 100 millimetres possible.

There are also warnings of gale-force winds for the Illawarra and Batemans coast regions, with strong winds predicted to continue into Friday.

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Damaging wind gusts of about 90km/hr are possible over the ranges west of the ACT, east to Bombala, south to Crookwell and north to Oberon, while winds of more than 125km/hr are likely in alpine areas above 1900 metres on Thursday.

There were flood watches for areas including Braidwood, Goulburn, Bombala, Tumbarumba, Tumut, Khancoban and Thredbo Top Station.

In South Australia, Wednesday’s strong winds were expected to return on Thursday, with damaging winds across much of the state, including Adelaide.

The BoM said damaging winds were most likely on Thursday, with showers and thunderstorms expected to become widespread in southern SA.

Heavy rain is also forecast, including up to 60 millimetres in parts of the Lofty Ranges late on Thursday and early Friday.

This may result in a localised riverine or flash flood threat, the BoM warns.

Meanwhile, Victorians will get more thunderstorms on Thursday, with possibly “severe” activity in the north-east.

There is a minor flood warning for Seven and Castle creeks and a watch for minor to moderate flooding for north-east Victoria. Gale warnings remain for the west and central coasts and the central Gippsland coast areas until Friday.

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There are also severe weather warnings for parts of east Gippsland and Victoria’s north-east forecast district.

“A complex low-pressure system moving across the Great Australian Bight and an associated trough and cold front are causing the potential for heavy rainfall today over NSW and adjacent parts of north-east Victoria,” the BoM said.

“This front will move offshore early Friday morning.”

In Tasmania, there is a strong wind warning for much of the state on Thursday.

Conditions are expected to worsen on Friday with gale warnings for Tasmania’s far-north-west coast, central north coast, Banks Strait and Franklin Sound and east of Flinders Island.

-with AAP