Cloudburst: Meaning, Himalayan Causes and Forecasting Limits
Why in the news
A deadly cloudburst in Uttarkashi, Uttarakhand, wrecked Dharali village and nearby areas, showing how climate change is worsening disasters in India.
Key facts
- Cumulonimbus clouds store moisture in rising air currents; a sudden collapse of those currents dumps rain within minutes.
- Warmer air holds about 7% more moisture per 1 degree C.
- Smoke and soot from forest fires, diesel vehicles and stubble burning add cloud condensation nuclei (CCN).
| Aspect | IMD definition | 2023 IIT Jammu-NIH study |
|---|---|---|
| Rainfall rate | Above 100 mm per hour | 100-250 mm per hour |
| Area covered | 20-30 sq km | About 1 sq km |
Why the Himalaya is vulnerable
- Steep terrain speeds runoff, triggering landslides and flash floods.
- Orographic effect: mountains lift monsoon winds, forcing rapid condensation.
- Rocky ground absorbs little water; settlements at 1,000-2,000 m are fragile.
Impacts and forecasting limits
- Flash floods, landslides, broken roads, bridges and power poles, and high casualties.
- Tiny scale and short duration defeat conventional forecasts.
- Too few Doppler radars and weather stations; late alerts for remote villages; costly AI warning systems remain underfunded.
Exam angle
- Research pair behind the 2023 definition: IIT Jammu and NIH.
- Related terms: orographic effect, cumulonimbus, CCN.