People in flood-risk areas told to prepare for up to 72 hours of isolation as heavy rains loom

Victorians are on alert for boundless flooding not long from now and a few occupants have been encouraged to plan for the chance of being segregated for as long as 72 hours as specialists prepare for weighty downpour before very long.

The downpour is supposed to begin on Wednesday yet top on Thursday and Friday.

"We know that our catchments are full. We know that we've had record rainfall to this point and the ground is absolutely sodden. So even a minor amount of rain would be a real risk in terms of flooding," Premier Daniel Andrews said.

Department of Meteorology forecaster Kevin Parkyn said the "genuine concern" was from the early long stretches of Thursday morning through until Friday, as boundless falls of somewhere in the range of 20 and 50 millimeters were extended across a lot of Victoria. Portions of the Incomparable Isolating Reach and Victoria's north could get up to 100 millimeters, he said.

Parkyn additionally cautioned there could be streak flooding in Melbourne on Thursday as the "critical precipitation occasion" hits. Riverine flooding was likewise a gamble from Friday and into the end of the week as water streamed downstream.

“This event is probably the most significant rain event widespread across the state this year,” Parkyn said.

A warning for Bogong Village and Falls Spring was issued on Tuesday because of a "sluggish active landslide" on the Bogong High Plains Road above Bogong Village.

Roads will be reduced to one lane and a diminished speed limit from midday on Wednesday. Vic premier Daniel Andrews said the state was prepared, with a helicopter fleet and generators prepared. Damaging winds of up to 100km/h are expected to hit Victoria on Thursday, from the Grampians in the state's west to alpine peaks in the east.

 The online warning tells those who need to access Falls Creek must do so before the closure, and be prepared to stay until the road is re-opened.