Parts of Victoria are expected to receive an unprecedented amount of rainfall as storms approach Australia's southeast. Melbourne is experiencing severe water surges, with an extraordinary downpour trapping a family under a bridge. A vast population is at risk from severe weather. Torrential rain and thunderstorms are expected to hit millions of Australians across the weekend. The recent weather conditions have included a significant seismic event, adding to the wild weather. Authorities are advising great care as the weather worsens.