Revision summary
A cloudburst is an extreme short downpour over a small area, often ~100 mm in an hour on a steep slope. In the Indian subcontinent it is mainly orographic convection in the Himalaya during monsoon or western disturbances. A slow-moving cell plus a narrow catchment turns rain into flash flood and landslide. Kedarnath June 2013 and Leh 6 August 2010 are well-documented cases; Amarnath 8 July 2022 is a later yatra-route example. Nowcasts, radar and keeping settlements off debris fans are the response.
Model answer
Copper italics in this answer — like this — are the key facts. Each one is unpacked in the Facts & figures rail.
Introduction
A cloudburst is an extreme, short-lived downpour over a small area—conventionally of the order of 100 mm in an hour—often on a steep Himalayan slope. The cloud does not ‘burst’ like a bag; rain falls faster than the ground or the drainage can take. In the Indian subcontinent this is mainly an orographic plus convective monsoon hazard.
Body
Mechanism
- Moist monsoon or western-disturbance air is forced up a steep hill. Rapid ascent cools the parcel, condensation is intense, and a deep cumulonimbus grows.
- A local convergence or a mesoscale vortex can stack more moisture into the same valley.
- If a weak steering wind holds the cell over one catchment, rain accumulates in minutes rather than being spread along a track.
- Orographic lift plus warm-cloud collision-coalescence yields large drops; the rainfall rate becomes extreme.
- On a slope, the same water becomes flash flood, debris flow and landslide. The disaster is hydrology and geology as much as meteorology.
Occurrence in the subcontinent
- Western and Central Himalaya (Jammu and Kashmir, Himachal, Uttarakhand) in the monsoon, and sometimes with western disturbances.
- North-eastern hills and steep Western Ghat pockets can see similar extreme cells.
- Plains can have very heavy convective rain; the term cloudburst is used most strictly for concentrated mountain downpours.
- Climate warming loads more moisture into the air (Clausius–Clapeyron), which can raise the intensity of such cells; attribution of one event still needs care.
Two well-known examples
- Kedarnath, Uttarakhand, June 2013: extreme rain and glacial-lake / debris-laden flood in the Mandakini catchment destroyed the shrine town and killed large numbers of pilgrims and residents. It is the benchmark Himalayan hydro-meteorological disaster of that decade.
- Leh, Ladakh, 6 August 2010: a cloudburst and flash flood on a high-altitude cold desert, unusual for a rain-shadow town, caused heavy loss of life and damage to the airfield and settlements.
- Amarnath, Jammu and Kashmir, 8 July 2022 is another documented cloudburst-related flash flood on the yatra route (use this if a ‘more recent’ second example is needed beside Kedarnath). Do not invent dates.
Preparedness (brief)
- Doppler weather radar in the hills, nowcasts, restricted building on fans and channels, and pilgrimage caps on forecast days.
Flow diagram
Conclusion
Cloudbursts in the subcontinent are orographic-convective extreme rains held over a small Himalayan catchment. Mechanism is rapid ascent, a stationary cell, and torrents on steep debris. Kedarnath 2013 and Leh 2010 (and Amarnath 2022) are the public memory of that physics. Warning and land-use are the only practical shields.
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Next question on this syllabus topic (2022 · Q10). View answer →
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Does a cloud physically burst?
No. It is a popular name for a stationary extreme convective downpour.
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Are cloudbursts only Himalayan?
The worst documented Indian disasters are Himalayan. Steep Ghats and northeast hills can see similar cells.
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