New Delhi: Water-related hazards continue to cause major devastation this year,” said Celeste Saulo, WMO Secretary-General. “The latest examples are the devastating monsoon flooding in Pakistan, floods in South Sudan and the deadly flash floods in the Indonesian island of Bali. And unfortunately, we see no end to this trend.”
Ms. Saulo noted that these emergencies have been happening amid increasingly warm air temperatures, which allow more water to be held in the atmosphere, leading to heavier rainfall.
Her comments coincided with the publication of a new WMO report on the state of the world’s waterways, snow, and ice, which notes that 2024 was the hottest year in 175 years of observation, with the annual mean surface temperature reaching 1.55 °C above the pre-industrial baseline from 1850 to 1900.
In India, the increasingly erratic behaviour of the world’s water cycle has affected parts of Himachal Pradesh or Jammu and Kashmir.
“The region saw extremely heavy rainfall when it was not expected; the monsoon came early,” said Sulagna Mishra, WMO Scientific Officer. “So, this is what we are talking about as the unpredictability of the system is growing, more and more.”
Turning to the impact of last year’s pronounced El Niño weather phenomenon, WMO’s report indicates that it contributed to severe drought in the Amazon basin last year.
Equally, northwest Mexico and the northern part of North America saw below-average rainfall, as did southern and southeastern Africa.
“El Niño at the start of 2024 played a role,” explained Ms. Saulo, “but scientific evidence shows that our changing climate and rising temperatures lead to more extreme events, both droughts and floods.”
The WMO report’s other findings confirm wetter-than-normal conditions over central-western Africa, Lake Victoria in Africa, Kazakhstan and southern Russia, central Europe, Pakistan and northern India, southern Iran and north-eastern China in 2024.
One of the key messages of the UN agency report is that what happens to the water cycle in one part of the world has a direct bearing on another.
Melting glaciers continue to be a major concern for meteorologists because of the speed at which they are disappearing and their existential threat to communities downstream and in coastal areas.
“2024 was the third straight year with widespread glacial loss across all regions,” Ms. Saulo said. “Glaciers lost 450 gigatonnes, this is the equivalent of a huge block of ice seven kilometres in height, seven kilometres wide and seven kilometres deep, or 180 million Olympic swimming pools, enough to add about 1.2 millimetres to global sea level, increasing the risk of floods for hundreds of millions of people on the coasts.”
According to report, European, African and Asian regions were the most heavily hit by unprecedented or notable extreme events. Most such events were a result of excess water (that is, flash floods, heavy rainfalls or associated landslides).
“Africa’s tropical zone experienced unusually heavy rainfall in 2024 compared to historical norms, resulting in more than 2 500 fatalities, 4 million people displaced and significant loss of infrastructure” said the report.
Europe experienced its most extensive flooding since 2013, with one-third of its river networks exceeding “high” flood thresholds, and Asia and the Pacific were hit by record-breaking rainfall and tropical cyclones, resulting in over 1 000 deaths.
Brazil experienced simultaneous extremes, with catastrophic flooding in the south of the country taking 183 lives and continuation of the 2023 drought in the Amazon basin, affecting 59% of the country’s territory as per the report.
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