Despite Gippsland and parts of Melbourne bearing the brunt of the damage, North East SES units still received more than 200 calls for assistance due to rain and high winds.

Rainfall totals exceeded 60 millimetres in the region and the highest total in the state was 275mm at Mt Baw Baw.

By Thursday morning, 2000 requests for assistance had been made across the state and 94 units were actively responding.

Requests for assistance had risen to 5000 by midday with significant power outages across the state.

North East crews including Chiltern were dispatched to assist in Kilmore, where 100km/h winds were recorded.

Between 40 and 60 centimetres of snow fell throughout Tuesday and Wednesday at Victorian Alpine resorts before the cold air moved into NSW.

The Bureau of Meteorology is forecasting snow on Friday and Saturday.

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Emergency Management Commissioner Andrew Crisp said the damage was widespread.

"There are more than 200,000 people in a significant part of the state that don't have power to their home," he said.

"In some areas it will take a number of days to restore power.

"What we're asking is for people to be sensible."

BOM senior meteorologist Kevin Parkyn said the low-pressure system had characteristics similar to an east-coast low.

"This had a nasty sting - it also had damaging and destructive winds," he said.

"Some of the more notable totals include at Mt Baw Baw with 278mm to 9am this morning, what looks like a record."

Victoria SES operations chief officer Tim Wiebusch said it was a unique event.

"The last time we've seen a wind event that's then led into a flooding event like this was 2008," he said.

"June in 2012 was the most recent event where we've seen similar flooding to what we're likely to see in the next couple of days."

BOM issued advice just before 1pm on Thursday that flooding was no longer expected in the Upper Murray, Mitta Mitta and Kiewa River Catchments.

Several flood warnings are current ranging from minor to major flooding in other parts of Victoria.