Twenty people have been hospitalised, with one man in a critical condition suffering a fractured skull, after a series of tornadoes swept across Victoria's northeast and fierce winds lashed the rest of the state.
Caravans were upended, roofs ripped off houses and buildings damaged as the tornado hit about 8pm (AEDT) yesterday, an SES spokesman said.
The tornado swept along Murray River townships near Bundalong, Rutherglen and Yarrawonga.
The SES fielded 60 calls for help in the region with 20 people hospitalised for injuries, according to the Herald Sun.
The newspaper also reported that a series of "mini-tornadoes" had hit the region.
A woman who filmed the tornado from her home in Mulwala, in the NSW-Victoria border region, last night reacted with disbelief as it brought lightning, strong winds and a hailstorm.
"This is like crazy. Oh my God! Look at the tornado!," she said.
"Oh my God mum, it is a tornado. That is insane"
The injuries and damage in northeast Victoria came as strong winds felled trees and damaged buildings across the state.
The SES spokesman said the greatest trauma risk was from falling buildings and roofs.
"It becomes dangerous and deadly debris," he said.
While the weather appeared to be a tornado, authorities had not yet officially confirmed it, the SES spokesman said.
"It definitely has tornado-like patterns. Certainly that's what it looks like," he said.
He said powerlines in the area are likely to be down.
SES volunteers have responded to more than 750 calls across the state since midnight on Wednesday amid wind gusts exceeding 100km/h.
Strong winds had hit Healesville, Nunawading and outer eastern metropolitan Melbourne, but the damage has been widespread.