What is the phenomenon of ‘cloudbursts’? Explain.
Approach · directive: “explain”
What it asks · Define a cloudburst, explain how it forms, where it strikes in India and why its impact is rising.
The question has 2 parts — answer each
- Define the phenomenon of a cloudburst
- Explain how it forms, where it strikes in India, why its impact is rising and how the risk can be reduced
Open with · A cloudburst is an extreme, highly localised downpour — commonly defined by IMD as about 100 mm or more of rain in an hour over a small area.
Cover
- Mechanism: moist monsoon air is forced up steep slopes (orographic lift); towering cumulonimbus clouds hold droplets in strong updrafts, then release them suddenly.
- Where: mainly the Himalayan states (Uttarakhand, Himachal Pradesh, Jammu & Kashmir, Ladakh) and at times the Western Ghats, largely in the monsoon.
- Why intensifying: warmer air holds more moisture, so extreme short-duration rainfall becomes more intense.
- Impacts: flash floods, landslides and debris flows; damage to roads, hydropower and settlements — e.g., Kedarnath 2013, worsened by a lake breach.
- Forecast challenge: the event is too small for most models; needs Doppler radars, dense rain gauges and nowcasting.
- Risk reduction: hazard zonation, no construction on river banks and debris cones, slope stabilisation, early warning to pilgrims and tourists.
Close with · Cloudbursts turn into disasters through exposure; disciplined land use in the mountains matters as much as better forecasting.
Add value (verified)
- In August 2026 the Home Ministry told the Lok Sabha that expert assessments link the rising intensity and frequency of extreme rainfall in the Himalaya to climate change. Incidents of Cloudbursts — PIB, Ministry of Home Affairs, 11 August 2026 ↗“as a consequence of climate change, the intensity and frequency of extreme rainfall events are increasing in the Himalayan region”
Question: UPSC's CS (Main) 2024, GS Paper I — paper ↗. Approach: Minimalist IAS, checked 30 Sept 2026 (how we verify) — UPSC publishes no model answers. ·
Model answer · 210 words (UPSC limit 150) · Minimalist IAS
A cloudburst is an extreme, highly localised downpour — the IMD treats about 100 mm or more of rain within an hour over a small area as one — that overwhelms slopes and streams within minutes.
How it forms
- Orographic lift: moist monsoon air is forced up steep Himalayan slopes, feeding towering cumulonimbus clouds.
- Suspended load: strong updrafts hold growing raindrops aloft; when the updraft collapses, the stored water falls at once over a few square kilometres.
Where it strikes
- Mainly Uttarakhand, Himachal Pradesh, Jammu & Kashmir and Ladakh (Leh, 2010) in July–August; occasionally the Western Ghats.
Why the impact is rising
- Warmer air holds more moisture, so short-duration extremes intensify; in 2026 the Home Ministry told the Lok Sabha that climate change is raising the intensity and frequency of Himalayan extreme rainfall.
- Exposure: buildings on river banks and debris fans, hydropower works and pilgrim traffic — Kedarnath 2013, worsened by the breach of the Chorabari lake.
- Forecast limits: too small and brief for most models; needs Doppler radars, dense rain gauges and nowcasting.
Reducing risk
- Hazard zonation and no-build zones along streams, slope stabilisation, and early warning for pilgrims and tourists.
Cloudbursts turn into disasters through exposure; disciplined land use in the mountains matters as much as better forecasting.
Written by Minimalist IAS from facts checked at source (how we verify) — a little fuller than exam length, so every part of the question is covered; in the hall, keep the structure and trim the detail. UPSC publishes no model answers: compare your structure and coverage with this, then write your own.