Melbourne can expect more wet weather as a band of thunderstorms could develop on Friday and Saturday.

Up to 50mm of rain could fall in some area of Victoria with a “topsy-turvy” weekend predicted by Sky News Weather metrologist Rob Sharpe.

“On Friday night into Saturday, a low pressure system is set to form over the top of Victoria. This will lead to heavy falls and widespread areas of rain moving east across the state,” he said.

Melbourne has already reached its average annual rainfall after 1.4mm fell in the city overnight. It is the earliest point of the year since September 1996.

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