A woman is dead after ferocious winds brought down a large tree on her family car, as rough seas also snapped the end off a Melbourne pier.
A child and a man are still fighting for their lives in critical conditions in hospital, while another child has minor injuries stemming from the "very large" gum tree's fall.
The State Emergency Service received 630 calls for help across Victoria in 24 hours due to heavy winds and rain on Friday morning.
Just after 9.30am paramedics were called to the Black Spur on the Maroondah Highway to try to free four people from a "serious incident".
"We saw a very large tree come down on a family car," SES chief officer Tim Wiebusch told reporters in Melbourne on Friday.
The woman, a front-seat passenger, died at the scene. Two children were taken to the Royal Children's Hospital while the male driver was taken to The Alfred hospital.
"One child has been airlifted to hospital with life-threatening injuries and the other taken to hospital by road ambulance with minor injuries," Victoria Police said.
Rough seas have also claimed the tip of Frankston's pier, which snapped off and floated away.
It later washed up on a nearby beach.
"It's fortunate the Bureau of Meteorology no longer has its weather station on the pier, it's now located on land. We all know what happened to the pier," BoM forecaster Kevin Parkyn told reporters.
Parks Victoria said the pier was due to be redeveloped anyway.
A number of flood warnings are still in place around Melbourne's outer suburbs, while heavy snow is expected in alpine regions.
A severe weather warning is in place for Gippsland, with damaging winds expected to reach up to 100km/h.
Mr Parkyn said the low pressure system that caused the terrible weather was a once in every five years type of event.
Mr Wiebusch said the SES had a number of calls about winds dislodging roofs and bringing down trees, while he warned people to be careful in the water around Frankston because debris from the pier might still be floating about.
Australian Associated Press