The vigorous front and trough will generate powerful winds and rain in South Australia, Victoria, Tasmania and southern NSW with highland snow.
Snow is forecast below 700m in Tasmania, and 900m in Victoria, NSW while the ACT is heading for sub zero temperatures by Monday.
In Melbourne and other parts of Victoria, it will drop below 8C at night.
In NSW there will be a mix of sun and cloud across the state today.
There are showers forecast along the coast and eastern ranges, possible afternoon thunderstorm in the northeast.
A shower or two on the far southern ranges and slopes, maybe evening snow on the Alpine peaks.
Further north, Brisbane will barely feel warmer than 20C at all on Monday and the “feels like” temperatures will remain low into the week due to dry windy conditions.