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© Supplied A car stuck in floodwaters at Canterbury Rd, Bayswater North.
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© Peter Buchstaller/SuppliedSevere storms have swept through Melbourne, hitting suburbs including Bayswater.
Victorians should brace for more rain and flash flooding after storms lashed the state last night.

Bureau of Meterology forecaster Terry Ryan said our summer deluge will continue well into the weekend, the Herald Sun said.

"There will be more rain today, and possible storms, with the heaviest rain expected in the ranges," Mr Ryan said.

"And we're expecting heavy falls tomorrow night or early Saturday morning."

Mr Ryan said the weekend storms, which could see 50mm rainfalls, could cause significant flash flooding around the state.

Last night, dozens of motorists were rescued by SES volunteers as storms lashed the city and suburbs.

The SES recorded more than 400 calls for assistance from residents in the outer eastern and southeastern suburbs.

Melbourne's outer eastern suburbs were the worst hit with significant flooding in Lilydale after 69mm of rain fell.

CFA firefighters rescued a woman and a group of small children trapped by flash flooding in Boronia.

At Knox about 150 households appealed to the SES for help from the floods.

About 50 calls came from each of Croydon, Bayswater and Lilydale.

Flash flooding partially inundated roads, and a handful of people became stuck when they tried to drive through the flood waters, according to SES regional duty officer Matt Taranto.

"We have had 20 or 30 rescue calls for people driving into flood waters and getting stuck," Mr Taranto said.

The flooding sparked commuter chaos with roads and train lines becoming submerged.

Flooding at Dandenong station caused delays of up to 20 minutes on the Cranbourne and Pakenham lines.

Water over level crossings at Mentone and Mordialloc also caused delays on the Frankston line.

The storm brought down power lines in Dandenong.

Further storm cells ensured Victoria's west didn't escape the deluge, with Mortlake copping more than 43mm of rain.

And there's more wet weather on the way.

Up to 50mm could fall on Melbourne this weekend, according to weather bureau senior forecaster Terry Ryan. Most of the rain is expected on Saturday morning.

The SES recorded 325 calls for assistance from residents in the outer eastern and southeastern suburbs between 5pm and 9.30pm.

CFA firefighters rescued a woman and a group of small children trapped by flash flooding in Boronia.

The heaviest rain was in Scoresby, which was drenched by 46mm over two hours.

But Knox residents were hardest hit. About 150 households appealed to the SES for help from the floods. About 50 calls came from each of Croydon, Bayswater and Lilydale.

Flash flooding partially inundated roads, and a handful of people became stuck when they tried to drive through the flood waters, according to SES regional duty officer Matt Taranto.

"We have had 20 or 30 rescue calls for people driving into flood waters and getting stuck," Mr Taranto said.

The flooding sparked commuter chaos with roads and train lines becoming submerged.

Flooding at Dandenong station caused delays of up to 20 minutes on the Cranbourne and Pakenham lines.

Water over level crossings at Mentone and Mordialloc also caused delays on the Frankston line.

The storm brought down power lines in Dandenong.

Further storm cells ensured Victoria's west didn't escape the deluge, with Mortlake copping more than 43mm of rain.

And there's more wet weather on the way.

Up to 50mm could fall on Melbourne this weekend, according to weather bureau senior forecaster Terry Ryan. Most of the rain is expected on Saturday morning.