More than 80 people have been killed by Tropical Storm Ana, which ripped across southern Africa after making landfall on Monday. Mozambique, Madagascar and Malawi have all been hit.
People have lost their lives in landslides and collapsing buildings, and have been washed away.
Classrooms, health facilities, and tens of thousands of homes have been destroyed in the flooding.
Malawi experienced a large blackout after the storm hit generating stations, while in Madagascar 130,000 people fled their houses.
Unicef said the storm is a blunt reminder that the climate crisis is a reality.
The organisation said: “The tropical storm sheds a light again on the risks and consequences of climate emergencies in the region, as well as the need for immediate humanitarian assistance from the onset.”
The region has repeatedly been struck by severe storms and cyclones in recent years, destroying homes, infrastructure and crops, and displacing thousands of people.
Experts say storms are becoming stronger and more frequent as waters have warmed.
Rising sea levels have also made low-lying coastal areas vulnerable.
The United Nations has warned that another storm has formed over the Indian Ocean and is expected to make landfall at the weekend.
It could evolve into a serious tropical thunderstorm in the coming days.
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