More rain could fall in Melbourne on Sunday than is usually recorded for the entire month of April with damaging winds and possible flash flooding forecast.
By 7am on Sunday, the State Emergency Service had responded to more than 140 requests for help across Victoria. But the emergency service said Saturday's storm was just a teaser to Sunday's worsening weather.
The Bureau of Meteorology predicts up to 60 millimetres could fall in Melbourne, higher than April's average monthly rainfall. Areas including the Dandenong Ranges and Yarra Valley could cop as much as 80 millimetres.
A severe weather warning has been issued for a large part of the state, while flash flooding warnings are in place for Bacchus Marsh and Geelong.
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Damaging winds with gusts of up to 110 kilometres per hour are expected and SES spokesman Kelvin Jewell said the winds may be upgraded from 'damaging' to 'destructive'.
"There will be another weather front crossing from the southwest [on Sunday morning] through into the central metropolitan region around early afternoon, and progressing into East Gippsland throughout the evening and into Monday," he said.
"There is quite a lot of rain associated with that, to the point where we're expecting some flash flooding in areas.
"The forecast at the moment is for damaging winds but there is the potential for that to be escalated to destructive winds."
Mr Jewell said the SES used calmer overnight conditions to clear existing requests for assistance and continue preparations for Sunday's storm activity.
By Sunday morning, flooding had been reported at Chadstone and Wheelers Hill with trees down at Carrum, Seaford and in the state's east.
The MCC has decided to close the MCG car park for Sunday's game between Essendon and Carlton because of the expected downpour.
Falls Creek, Ballarat, Geelong and Kyneton are also on alert.
Squally winds and rainfall aren't expected to ease until late Sunday night.
On Saturday, a man was treated by paramedics for a small facial cut when a tree fell on his car at Lyndhurst just before 4.15pm and a part of a building collapsed onto a road at Trafalgar in Gippsland about 5pm, but no one was injured.
Weatherzone: Melbourne storm tracker mapA small number of international flights to Melbourne were redirected on Saturday afternoon, but no departing flights were affected.
Melbourne Airport spokesman Grant Smith urged travellers to check with their airline to see if their flight would be affected on Sunday.
"It really does depend on what the day throws at us as to how the day pans out," he said.
Melbourne's temperature had climbed to 17.5 degrees at 6am on Sunday but plummeted to 11.7 by 9am.
Bureau of Meteorology senior forecaster Richard Carlyon said Sunday's forecast maximum of 19 degrees was likely to be reached early.
"Later in the afternoon it will be closer to 12 or 13 degrees. It will be a real contrast to the weather we've been experiencing though March and into April," Mr Carlyon said.
Despite the expected deluge the day is unlikely to break the record for Melbourne's wettest April day, which occurred in 1960 when 80mm of rain fell.
Glen Eira mayor Mary Delahunty said the stormy conditions won't stop a community fun day to launch Melbourne's most expensive playground, a new $10.8 million play space at Glen Huntly's Booran Reserve.
The cold front is only forecast to stick around until mid-week, with the thermostat to head north again on Wednesday and Thursday.
"We should see a lot more sun around by then as well, so this cold wintry spell shouldn't last too long," Mr Carlyon said.
A flood watch has been issued for the Werribee, Maribyrnong, Yarra, Dandenong and Bunyip catchments.
The Bureau said the Flood Watch means people living or working along rivers and streams should be alert to any warnings and ready to move to higher ground should if necessary.
Mr Carlyon said there was a possibility rivers would rise very quickly.
The Bureau of Meteorology and Melbourne Water will monitor the situation and issue catchment specific warnings if and when required.
To stay up-to-date, check the Vic Emergency website.