The caveat is that vulnerable countries like Mozambique will be hit the hardest, unless nations around the world take urgent action. United Nations Secretary General António Guterres said Cyclone Idai and its rising death toll were "yet another alarm about the dangers of climate change."
"Such events are becoming more frequent, more serious and more widespread, and this will only get worse if we do not act now," said the UN chief.
"In the face of turbocharged storms, we need to accelerate climate action," he added, addressing reporters at the UN headquarters in New York.
The Secretary General convened a Climate Action Summit in September, to try to mobilize countries around the urgent need to reduce global warming to less than two degrees Celsius above pre-industrial levels, in line with the Agreement on 2015 Paris.
The death toll in Mozambique, Malawi and Zimbabwe is around 700, but the numbers are expected to rise, with hundreds missing.
About three million have been affected, nearly two-thirds of them in Mozambique, where the key port city of Beira was "practically washed to the ground" while the hinterland of farmland was flooded, Mr. Guterres said.
At least a million children are in need of "urgent assistance" and "we fear that entire villages have been dragged to places we have not yet reached," added the UN chief, with reports that infrastructure worth $ 500 has been destroyed. 1,000 million dollars.
He said that citizens of the three southern African nations would need "strong and sustained support."
The UN launched a revised $ 281.7 million emergency appeal for Mozambique, designating the disaster as a "large-scale emergency," which is the most serious.
"I call on the international community to fund these appeals quickly and fully so that aid agencies can accelerate their responses," said Mr. Guterres.
Conditions for the survivors of Cyclone Idai remain dire, with enormous devastation and "extremely high risk of diarrheal diseases such as cholera," the World Health Organization (WHO) said, informing reporters in Geneva.
Dr Djamila Cabral, WHO Representative in Mozambique, said that in Beira, Mozambique, more than 100,000 people have lost their homes and all their possessions.
At least 1.8 million people need humanitarian assistance in Mozambique alone.
To prevent a cholera outbreak, WHO is shipping 900,000 doses of the oral cholera vaccine to the devastated country that should arrive by the end of this week.
To coordinate the food needs of cyclone victims, the World Food Program (WFP) targets 1.7 million people in Mozambique with food assistance, 732,000 in Malawi, and 270,000 people in Zimbabwe.
Assistance also includes logistics and emergency telecommunications support.
Satellite images show numerous floodplains, including an "inland ocean" the size of Luxembourg, WFP said in a statement.
In a separate appeal, covering other needs, such as housing, clean water and sanitation, the UN Office for the Coordination of Humanitarian Affairs (OCHA) and humanitarian partners requested $ 282 million to support the victims in Mozambique.
According to OCHA, almost half a million hectares of crops have been flooded, along with enormous damage to homes and infrastructure.