Understanding Cloudbursts in India: Definition, Formation, Forecasting Challenges, and Accountability
This explainer defines a cloudburst as a highly localized weather event where a small area receives 10 cm or more of rain in an hour. While relatively rare, global warming is increasing their frequency. Cloudbursts are difficult to forecast due to their small scale, rapid development, and challenging mountainous terrain which blocks radar signals. The article highlights that the term 'cloudburst' is often misused, potentially obscuring human negligence related to poor planning, illegal construction, deforestation, and inadequate drainage, as seen in past tragedies. India is working on 'nowcasting' and expanding its radar network to improve predictions.
Key Points
- A cloudburst is defined by the IMD as 10 cm or more of rain in an hour over a small area (20-30 sq. km).
- Global warming is increasing the frequency of cloudbursts, especially in mountainous regions like Uttarakhand, Himachal Pradesh, and J&K.
- Forecasting cloudbursts is challenging due to their localized nature, rapid formation, and radar limitations in rugged terrain.
- The term 'cloudburst' can be misused to deflect blame from human factors like poor planning, illegal construction, and inadequate infrastructure.
- India is improving forecasting through 'nowcasting' technology and expanding its radar network under 'Mission Mausam'.
Exam Facts
- India Meteorological Department (IMD) definition: 10 cm+ rain in an hour over 20-30 sq. km.
- 'Mini-cloudburst' definition: 5 cm rain in an hour over the same area.
- 'Mission Mausam' initiative aims to double India's radar network.
- Examples of affected regions: Uttarakhand, Himachal Pradesh, Jammu and Kashmir, Assam, Nagaland.
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