Millions of residents along Australia’s eastern coast are bracing for the arrival of a very slow-moving storm, the strongest tropical cyclone to threaten the region in more than 50 years. Tropical Cyclone Alfred is expected to make landfall early Saturday with the strength of an Atlantic tropical storm.

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.

The tropical storm, named Alfred, is on track to bring dangerous winds and flooding along the coast of southeastern Queensland, including the country’s third-largest city.