Residents are stacking sandbags to protect low-lying properties ahead of a tropical cyclone that is forecast to become the first in 51 years to hit the Australian east coast near Brisbane, the nation's third-most populous city.

Tropical Cyclone Alfred is forecast to cross the coast between the Queensland state capital Brisbane and the tourist city of Gold Coast to the south late Thursday or early Friday.

Millions of residents along Australia’s eastern coast are preparing for the impact of the most southerly cyclone to threaten the region in more than five decades.