A "SIGNIFICANT widespread rain and thunderstorm event" could replicate conditions the district experienced during flood events in late 2010 and early 2011. Flooding in early 2011 was the worst to hit this area in a century. The Bureau of Meteorology issued a severe weather warning for all of Victoria from today to Sunday, with both flash and riverine flooding possible in some areas. Flood watch warnings have already been issued for the Loddon, Avoca and Campaspe catchments. Rainfall across northern Victoria over the first three days of the month could be equivalent to the long-term average Summer rainfall. Bureau of Meteorology senior forecaster Scott Williams said that a slow-moving deep low forming over Victoria was being fuelled by significant moisture following weeks of humid conditions. "This is a very big event, a very widescale event and it's right at the top end of rainfalls that we've seen in Victoria in the last 30 years," he said. Mr Williams said there could be rainfall of up to 300 millimetres in the State's north-east ranges. He said that thunderstorms were common in November, but not on this scale. "November traditionally is a thundery time. It's our peak season for thunderstorms and we do get heavy rain but I'm talking heavy rain as 50, 60 maybe 100 millimetres," he said. Flood watches were issued on Wednesday and updates will be provided as the rain and thunderstorm event moves across Victoria. The heaviest rainfalls are predicted to occur between Friday afternoon and Sunday afternoon over northern Victoria and southern New South Wales, where widespread totals of more than 100 millimetres are expected. Storms and possible heavy falls are predicted today, with a 95 per cent chance of between 20 and 60 millimetres of rainfall occurring – well above the December average of 27.1 millimetres. RESIDENTS and visitors are reminded to: • Never drive, ride, swim or walk through floodwater; • Stay away from all waterways including drains and culverts; • Keep in contact with neighbours; and • Be prepared to act quickly. The Victoria State Emergency Service can provide emergency assistance during flooding events, and can be contacted by phoning 132 500. Listen to ABC radio for emergency service updates. In life-threatening emergencies, call Triple Zero (000).