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Flash flooding as massive rainstorm hits Melbourne logo 6/11/2018 Sean Davidson

Melbourne drenching. © Vince Caligiuri/Getty Images Melbourne drenching. A slow-moving storm has caused flash flooding in Melbourne with half of the city's November rainfall arriving in just three hours.

More than 30mm of rain has fallen since 9am on Melbourne Cup Day, causing train delays and soaking racegoers at Flemington.

Flooding has caused chaos along the Kingsway, at the tunnel entrance onto the CityLink, as well as in parts of Southbank, Rowville and Narre Warren.

Cars have been submerged, leaving some motorists pushing their cars through the floodwaters.

Olympic Park has so far received 35mm of rain, while Melbourne Airport copped 34.6mm.

"It's a very slow moving system," Weatherzone meteorologist Joel Pippard told

"It's a big long line of heavy rain."

Mr Pippard said conditions are expected to ease over the next few hours but a few showers are still forecast.

Flash flooding has also caused chaos on the train lines with service to Flemington Racecourse temporarily halted.

Crews have been urgently sent in to clear the water before the races finish this afternoon.

This morning, flights were diverted from Melbourne Airport because of unsafe landing conditions.

A Jetstar flight from Sydney flew all the way to Melbourne before returning when it couldn’t land.

The November rainfall average in Melbourne is 60mm.

Melbourne received more rain in three hours than in all September and October together. 

The SES has received 402 calls for help in the past 24 hours, with 254 current jobs, which are mostly flood releated, still active. 

Weatherzone have confirmed it is one of the wettest Melbourne Cups ever and are investigating if a new milestone has been set.

More to come.

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