A burst of tropical moisture is heading Victoria's way

The Bureau of Meteorology has predicted a burst of tropical moisture, coming in from the north-west, as a low-pressure system tracks across the state.

Senior forecaster Michael Efron said initially conditions would be dry on Friday, but rain and thunderstorm activity would develop from the north-west.

"One of the features on Friday will be that humidity, we are really going to see that building, especially across central and eastern parts of the state," Mr Efron said.

"By the end of Saturday, we should see totals of 15-25 millimetres in the central and western districts, but over the northeast, those falls will be higher.

"We are looking at 70-90mm across the northeast ranges, with some falls in excess of 100mm."

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Wet catchments in the region would lead to renewed concerns about flooding.

There was also the chance of snow falling in the Alps.

But the system would be followed by colder, windy weather, and temperatures were expected to plummet.

"One feature, throughout Saturday afternoon, will be reasonably strong southerly winds, which will make things feel quite chilly, in contrast to Friday," he said

The bureau said a low-pressure trough currently extends from inland Australia, but a weak cold front is approaching Tasmania.

It will cross Tasmania as the trough weakens.

A high-pressure system over the Southern Ocean will follow the front, extending a ridge across Tasmania and southern Victoria on Thursday.

A low-pressure system will then cross central Australia on Friday, moving towards the east coast on Saturday.

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