Wild weather overnight has brought down large trees and caused flooding at Healesville, north-east of Melbourne.
The State Emergency Service (SES) says it received about 20 calls for help, most of them to remove fallen trees.
Parts of the Healesville caravan park have been flooded and farmland has also been inundated.
Rain is continuing to fall in the region, and the SES is warning farmers to move stock and machinery to higher ground.
Road closures are also expected.
Weather Bureau senior forecaster Richard Carlyon, says the area's already had at least 50 millimetres of rain, and more is on the way.
"The Yarra catchment's had the highest falls, particularly up in the highest areas, where falls have exceeded 50 millimetres in the last 24 hours, and that's still likely to be the area over the next 24 hours where we'll see the highest falls," he said.
"So around Healesville, we've had some hefty falls."
© ABC 2012
16:06 EST The weather bureau has implemented a new system of forecasting the seasonal outlook called Predictive Ocean Atmosphere Model for Australia, or POAMA.