Heavy rains in eastern Australia forecast to intensify over the weekend are threatening to wipe out or damage up to 4 million tonnes of wheat due to be harvested shortly. Most of the state of Victoria and parts of the states of South Australia and New South Wales were facing a major weather event in the coming days from torrential rains, according to Australia’s Bureau of Meteorology. Australian farmers have had a rough wheat growing season this year. A severe drought earlier in the year reduced yields, with the world’s fourth-largest wheat exporter set to harvest its smallest crop in a decade.