'Dangerous' jet stream bringing rain, hail, snow and cold weather to Australia

Summer might be just weeks away, but it sure won't feel that way in the coming days.

After a brief reprieve from the wet weather, millions of Aussies are again bracing for stormy conditions, with cold temperatures and even snow on the way.

Showers and thunderstorms are forecast across most of NSW today and the Bureau of Meteorology says an unseasonal period of chilly weather will follow.

"A powerful and meandering jet stream will pass over Australia during the next 48 hours, producing a dangerous mix of damaging winds, heavy rain, severe thunderstorms, hail and snow in multiple states," Weatherzone meteorologist Ben Domensino warned on Monday.

Widespread rain is expected on already saturated or flooded catchments, with creeks and rivers in some areas likely to rise rapidly.

Of main concern are already-affected communities reeling from floods in the past few weeks.

Following the wet, cold air is likely to sweep over Australia's southeast, bringing cold temperatures, showers and alpine snow until midweek – all of which are unseasonal for November.

More heavy rain and possibly hail will hit western and southern NSW, with a severe thunderstorm warning for damaging winds and heavy falls issued for Nyngan, Cobar, Bourke, Wilcannia, White Cliffs and Ivanhoe.

For the next fortnight, above median rainfall (greater than 60 per cent chance) is forecast for most of eastern Australia, increasing to very likely (greater than 80 per cent chance) for the northeast and far southeastern mainland.

Snow is possible around the Central Tablelands and a light dusting might fall around the Northern Tablelands.

Meanwhile, there are still more than 80 State Emergency Service hazard warnings current for NSW.

They include evacuation orders for the Riverina town of Cootamundra where Muttama Creek is in flood.

Residents along the Murray River at Willow Bend, Moama and Mathoura have also been advised to seek higher ground, as have those on Adelong Creek, southeast of Wagga Wagga, which is a tributary of the Murrumbidgee River.

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Meanwhile rain and thunderstorms are also on the card from this morning for many Queensland residents.

"Severe storms with heavy rain possible in southern and inland southeast Queensland" early Tuesday morning, the Bureau of Meteorology said.

"Severe storms with damaging winds and large hail possible in some eastern parts in the afternoon and evening," the state bureau added.

with AAP

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