South Asia’s Terrifying Cloudburst Crisis

The skies of South Asia have turned into a source of dread. What once brought life through nourishing monsoons is now delivering terror in the form of cloudbursts. These violent rainstorms, which release more than 100 millimeters of rain in just an hour over a confined area, are no longer rare. They are becoming frighteningly common, sweeping away homes, farmland, and entire communities in mere minutes.

The destructive power of a cloudburst is almost unimaginable. In 2010, a sudden cloudburst in Leh, Ladakh, killed more than 200 people overnight, burying villages under mud and debris. In July 2023, parts of Himachal Pradesh and Uttarakhand saw more than 200 deaths in days as bridges collapsed and roads disappeared. Pakistan too has been repeatedly battered by these extreme rainfall events. The 2022 floods, worsened by cloudburst-like downpours, displaced over 33 million people and submerged a third of the country. The economic cost alone was estimated at over $30 billion. Behind these numbers are countless families who lost everything, homes, harvests, and loved ones, in a matter of hours.

Why are cloudbursts now so common? Science has a clear answer. When the temperature increases, the atmosphere is easier to hold water. Air is able to hold 7 percent more water for each degree rise in temperature. The south Asian climate is warming at a faster rate than the average and this increases the weight of the monsoon clouds and makes them dangerous. As these moisture-filled clouds crash onto the Himalayas they are compelled to rise again causing explosive explosions of rain. Statistics indicate that since the year 1950, heavy rainfall in India has grown by 75 percent (greater than 100 millimeters in a single day). There is a similar strengthening in Pakistan, Nepal, and Bangladesh. South Asia has been identified by the Intergovernmental Panel on Climate Change as being one of the most vulnerable parts of the world to such extreme precipitation.

This is made worse by the geography of the territory and the presence of man. Himalayas as well as Hindu Kush ranges confine the storm system to focus rainfall in delicate valleys. The rains in Pakistan bring flash floods in the Gilgit-Baltistan where sudden rains often devastate villages leaving whole districts isolated. Landslides in Nepal and the Indian Himalayas are a killer consequence of cloudbursts with deadliness. Even cities are not an exception. Urban cloudbursts have occurred in Islamabad, Lahore, Delhi and Mumbai in recent years, whereby the drains just cannot withstand the sheer amount of rain and the result is floods in neighborhoods during minutes.

The degradation is enhanced with ecological destruction. It has been characterized by the widespread encroachment of wetlands, forests and natural drainage systems through urbanization of the region. Vegetation-free mountains are unable to absorb surplus water. Open land is replaced with concrete and converts rain to floods. Vulnerable communities are the most affected who include: families that reside in low-lying community areas, farmers who rely on the monsoons, as well as communities that inhabit the mountains whose dwellings are sited on unstable hillsides.

There is as well, the hidden threat in the offing. The number of glacial lakes in Himalaya is growing due to the retreat of these glaciers under the heat. Even scientists are cautious warning that over 200 such pieces of water are on the brink of exploding. One cloudburst can break their thin walls leading to Glacial Lake Outburst Floods which can destroy whole valleys. This is not a far-fetched nightmare especially to the people in northern Pakistan, Nepal and the Indian Himalayas; it is a day-to-day terror to them.

The future, if current trends continue, is deeply alarming.  According to climate models, there will be 25 to 50 percent increments in the extreme rainfall events in South Asia during the middle of the century. It will mean the increase in cloudbursts, it will mean the increase in flash floods, it will mean the increase in displacement. In fact, the United Nations had already warned that in the future the climate-related catastrophes would drive tens of millions of South Asians out of their homes in the decades to come. The refugee situation that was observed during the 2022 floods in Pakistan can turn into nightmarish reoccurrence in the region.

The answer to the question as to whether we will again be facing cloudbursts is not in the affirmative but whether we are going to be in a much better position to cope up with it. Early warning mechanisms, better flood control systems, and readable and responsible urban planning with an eye towards ecological carrying capacity are all needed in South Asia. Mountains should be regarded as vulnerable areas and strict control of construction should be done. To provide natural buffers, the wetlands and forests will have to be restored. And most importantly is the need to speed up climate action across the world. The South Asia region is responsible of emitting just a fraction of the global greenhouse gases but it is immensely affected by some of the worst effects.

The skies are different, so now we should be. Cloudbursts are not accidental calamities; they are the most raving alarms of the climate change. Each year, human lives, more houses, more future are swept away. South Asia cannot afford complacency. Otherwise, these are warnings that could lead to the death of millions of people should the world ignore them. With the explosion of the sky, the latter does not bring life anymore, but it takes it. South Asia is the evidence. And unless something is done now, tomorrow the catastrophe will be new normal.