GS-I: Geography | Climatology | Disaster Management
GS-III: Environment | Disaster Management
Context
- Frequent use of the term: Following flash floods and sudden heavy rainfall, the term ‘cloudburst’ is often used by authorities and the media to describe the event.
- Editorial’s concern: The editorial argues that the term is frequently misused, which may divert attention from poor planning, weak infrastructure and governance failures that aggravate disaster impacts.
What is a Cloudburst?
- IMD definition: According to the India Meteorological Department (IMD), a cloudburst is an event in which 10 cm or more rainfall occurs within one hour over a small area of about 20–30 sq. km.
- Extreme rainfall event: A cloudburst is much more intense than normal heavy monsoon rainfall and causes rapid accumulation of water over a limited area.
- Flash floods: Since the rainfall occurs within a very short period, the ground cannot absorb the water quickly enough, resulting in flash floods and widespread destruction.
- Mini-cloudburst: Some scientists have proposed a category called “mini-cloudburst”, involving 5 cm rainfall within one hour over the same area, as it can also cause severe damage depending on the terrain.
Occurrence of Cloudbursts in India
- Relatively rare events: Cloudbursts are uncommon compared to normal monsoon rainfall but are becoming more frequent as global warming increases the atmosphere’s moisture-holding capacity.
- Official records: According to a statement made in Parliament in 2019, the IMD recorded around 30 cloudburst incidents between 1970 and 2016.
- Possible underestimation: Experts believe the actual number may be higher because many cloudbursts occur in remote mountainous areas where weather stations and rain gauges are sparse.
- Vulnerable regions: Uttarakhand, Himachal Pradesh and Jammu & Kashmir have witnessed a rise in reported cloudburst-like events, particularly during July and August.
How Does a Cloudburst Form?
- Convection: Warm, moisture-laden air rises rapidly into the atmosphere.
- Orographic lifting: In mountainous regions, monsoon winds are forced upward by steep slopes, enhancing cloud formation.
- Formation of cumulonimbus clouds: Rising air cools and condenses to form towering cumulonimbus clouds, which may extend up to 15 km in height.
- Strong updrafts: Powerful upward air currents keep raindrops suspended for longer, allowing them to grow larger.
- Sudden release: When the droplets become too heavy or the updraft weakens, enormous quantities of water fall almost simultaneously, resulting in a cloudburst.
Concerns Highlighted in the Editorial
- Misuse of the term: Labeling every extreme rainfall event as a cloudburst may create the impression that the disaster was entirely unavoidable.
- Reduced accountability: Such descriptions may shift attention away from governance failures such as poor drainage, illegal construction, encroachment on riverbeds and deforestation.
- Dharali floods (2025): Initial reports attributed the Uttarakhand floods to a cloudburst, but later meteorological analysis found rainfall below the IMD’s cloudburst threshold.
- Underlying causes: The editorial attributes the disaster primarily to illegal construction, deforestation and inadequate drainage infrastructure rather than a cloudburst.
- Recent clarification: The IMD also rejected reports that recent floods in Assam and Nagaland were caused by cloudbursts.
Why are Cloudbursts Difficult to Forecast?
- Highly localised phenomenon: Cloudbursts occur over areas much smaller than the grid size used in most weather prediction models.
- Rapid development: They form and intensify within a short period, leaving little time for advance forecasting.
- Mountainous terrain: Mountain ranges obstruct Doppler Weather Radar signals, creating blind spots in weather monitoring.
- Limited observation network: Remote hilly regions have relatively fewer automatic weather stations, reducing the availability of real-time weather data.
Government Initiatives
- Nowcasting: The IMD is strengthening nowcasting, which provides short-term weather alerts every few hours.
- Mission Mausam: Under Mission Mausam, the Government plans to more than double India’s Doppler Weather Radar network and utilise Artificial Intelligence (AI) for improved hyperlocal weather prediction.
Way Forward
- Improve weather observation: Expand the network of Doppler Weather Radars and automatic weather stations, particularly in mountainous regions.
- Strengthen forecasting: Develop high-resolution weather models and improve hyperlocal forecasting capabilities.
- Enhance disaster preparedness: Strengthen early warning systems and improve communication with vulnerable communities.
- Promote risk-sensitive planning: Prevent construction in ecologically fragile and flood-prone areas through better land-use planning.
- Ensure accountability: Distinguish between genuine cloudbursts and disasters aggravated by poor infrastructure and environmental degradation.
Conclusion
- The editorial argues that while cloudbursts are genuine meteorological phenomena, they should not become a convenient explanation for every flood-related disaster.
- Scientific classification of extreme rainfall events, combined with better forecasting, resilient infrastructure and accountable governance, is essential for reducing disaster risk in vulnerable regions.
UPSC Mains Practice Question
Q. What is a cloudburst? Why are cloudbursts difficult to forecast? Discuss how the misuse of the term may obscure governance failures in disaster management.
