Properties in the suburb of Goodna, Australia, in the far south-western outskirts of Brisbane, are seen inundated by flood waters Tuesday.

Properties in the suburb of Goodna, Australia, in the far south-western outskirts of Brisbane, are seen inundated by flood waters Tuesday. / Bradley Kanaris/Getty Images

Thousands have been ordered to evacuate as the southeast coast of Australia experiences the worst flood in decades.

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A family looks at a nearly submerged lamp post from the banks of the overflowing Clarence River in Grafton, Australia, some 80 miles from the New South Wales town of Lismore, on Tuesday.

A family looks at a nearly submerged lamp post from the banks of the overflowing Clarence River in Grafton, Australia, some 80 miles from the New South Wales town of Lismore, on Tuesday. / Saeed Khan/AFP via Getty Images

A man carries a wedding photo as people evacuate homes inundated by floodwaters Sunday in Goodna, Australia.

A man carries a wedding photo as people evacuate homes inundated by floodwaters Sunday in Goodna, Australia. / Dan Peled/Getty Images

In an aerial view, vehicles are seen stuck along a street as floodwaters surround Gympie, Australia, on Sunday in an area north of Sunshine Coast.

In an aerial view, vehicles are seen stuck along a street as floodwaters surround Gympie, Australia, on Sunday in an area north of Sunshine Coast. / Bradley Kanaris/Getty Images

A local watches the floodwaters in Brisbane, Australia's central business district Monday.

A local watches the floodwaters in Brisbane, Australia's central business district Monday. / Peter Wallis/Getty Images

A man paddles his kayak next to a submerged bus on a flooded street in the town of Milton in suburban Brisbane, Australia, on Monday.

A man paddles his kayak next to a submerged bus on a flooded street in the town of Milton in suburban Brisbane, Australia, on Monday. / Patrick Hamilton/AFP via Getty Images

In an aerial view Sunday, floodwaters surround the town of Gympie, Australia, in an area north of Sunshine Coast.

In an aerial view Sunday, floodwaters surround the town of Gympie, Australia, in an area north of Sunshine Coast. / Bradley Kanaris/Getty Images

A family stays next to a flooded street in Lawrence, Australia, some 45 miles from the New South Wales town of Lismore, on Tuesday.

A family stays next to a flooded street in Lawrence, Australia, some 45 miles from the New South Wales town of Lismore, on Tuesday. / Saeed Khan/AFP via Getty Images