Weather-related disasters have skyrocketed over the past half-century, causing far more damage even as better warning systems have meant fewer deaths, the UN said Wednesday.

A report from the UN's World Meteorological Organization (WMO) examined mortality and economic losses from weather, climate and water extremes between 1970 and 2019.

It found that such disasters have increased fivefold during that period, driven largely by a warming planet, and warned the upward trend would continue.

"The number of weather, climate and water extremes are increasing and will become more frequent and severe in many parts of the world as a result of climate change," said WMO Secretary-General Petteri Taalas.

In total, there were more than 11,000 disasters attributed to these hazards globally since 1970, causing more than two million deaths and some $3.64 trillion in losses.

Hurricane Ida, which slammed into the US Gulf Coast at the weekend and killed at least four people, could become the costliest weather disaster on record, Taalas told reporters.

"There is a chance that the economic cost will be higher then Katrina," he said, while adding that improved prevention and protection measures had ensured that Ida caused only a fraction of the casualties of the giant storm that devastated the same area exactly 16 years earlier.

Until now, Katrina, which killed more than 1,800 people and destroyed large parts of New Orleans, had been considered by far the costliest weather-related disaster, racking up nearly $164 billion in economic losses.

- 115 deaths each day -

On average, a disaster linked to weather, climate and water extremes has thus occurred every single day over the past 50 years, killing 115 people and causing $202 million in daily losses, the WMO report found.

More than 91 percent of the deaths occurred in developing countries, it said.

Droughts were responsible for the largest losses of human life during the period, alone accounting for some 650,000 deaths, while storms have left over 577,000 people dead.

Floods have meanwhile killed nearly 59,000 over the past 50 years and extreme temperatures have killed close to 56,000, the report found.

On a positive note, the report found that even as the number of weather and climate-related disasters ballooned over the past half-century, the number of associated deaths declined nearly threefold.

The toll fell from over 50,000 deaths each year in the 1970s to fewer than 20,000 in the 2010s, WMO said.

And while the 1970s and 1980 reported an average of 170 related deaths per day, the daily average in the 1990s fell to 90, and then to 40 in the 2010s.

Taalas said dramatic improvements in early warning systems were largely to thank for the drop in deaths.

"Quite simply, we are better than ever before at saving lives," he said.

- More people exposed -

WMO stressed though that much remains to be done, with only half of the agency's 193 member states currently housing the life-saving multi-hazard early warning systems.

It also cautioned that severe gaps remained in weather and hydrological observing networks in Africa and parts of Latin America and in Pacific and Caribbean island states.

Mami Mizutori, who heads the UN office for disaster risk reduction, also hailed the life-saving impact of the improved early warning systems.

But she warned that "the number of people exposed to disaster risk is increasing due to population growth in hazard-exposed areas and the growing intensity and frequency of weather events."

And while early warning systems save lives, they have done little to shield disaster-prone areas from swelling economic damage.

In fact, the reported losses from 2010 to 2019 stood at $383 million per day -- seven times more than the some $49 million in average daily losses in the 1970s.

Seven of the costliest 10 disasters in the past 50 years have happened since Katrina hit in 2005, with three of them in 2017 alone: Hurricane Harvey, which caused nearly $97 billion in damages, followed by Maria at close to $70 billion and Irma at almost $60 billion.

Hurricane Ida could become costliest weather disaster: UN
Geneva (AFP) Sept 1, 2021 - Hurricane Ida, which slammed into the US Gulf Coast at the weekend, could become the costliest weather disaster on record, the UN said Wednesday, hailing though that prevention measures had dramatically limited casualties.

Louisiana and Mississippi are still taking stock of the disaster inflicted by the powerful Category 4 storm that hit exactly 16 years after Hurricane Katrina made landfall and devastated the area.

Ida is known to have killed four people, although the death toll is expected to rise, and knocked out power for more than a million properties across Louisiana.

"There is a chance that the economic cost will be higher then Katrina," Petteri Taalas, who heads the UN's World Meteorological Organization (WMO), told reporters in Geneva.

He pointed as an illustration to the "major damage to the electric system in Louisiana."

Until now, Katrina, which killed more than 1,800 people and destroyed large parts of New Orleans, had been considered by far the costliest weather-related disaster.

A fresh WMO report that examined mortality and economic losses from weather, climate and water extremes between 1970 and 2019, found that Katrina had raked in nearly $164 billion in economic losses.

Currently, hurricanes Harvey and Maria, which both hit in 2017, are considered the second and third-costliest weather-related disasters, carrying price tags of nearly $97 billion and over $69 billion respectively.

Taalas said it would likely take a month or more before a full cost estimate for the losses caused by Ida could be made.

But he hailed that improved early warning and flood protection systems as well as evacuation procedures appeared to have saved numerous lives.

"The good news when it comes to Ida is that the casualties as compared to Katrina, they were much lower," Taalas said.

Mami Mizutori, who heads the UN office for disaster risk reduction, agreed.

She told reporters that the differences between the impacts of the two storms showed the importance of investing in prevention.

"The economic loss indeed will be quite big, but the good news is that ... the mortality has been very, very low, and this is because the city of New Orleans and Louisiana ... invested in prevention."

What had made the biggest difference since Katrina, she said, was the $14.5 billion invested in building flood walls and levees as part of a new "hurricane and storm damage risk-reduction system."

"They did not wait for another century to do this. They did it very quickly."

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