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Cloudburst Events in the Indian Himalayas: A Historical Geospatial Perspective

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International Handbook of Disaster Research

Abstract

In the past decade, the southern rim of the Himalayas experienced several anomalous weather events such as cloudbursts, extreme precipitation, flash floods, and avalanches due to a changing climate. The topography and orography process of the Indian Himalayas facilitates a favorable condition to cloudbursts. These events mostly appear during the monsoon period and are elusive corresponding to their geographical position and associated impacts due to a lack of monitoring and data observations. The sudden downpour of rainfall in a range of 100–250 mm/h in a short span covering a smaller spatial extent similar to 1 km2 is typically defined as a cloudburst event. On the other hand, according to the India Meteorological Department, if the rainfall occurs more than 100 mm/h with strong winds and lightning over an area of 20–30 km2 is termed a cloudburst. Interestingly, the elevation band where the occurrence of such events is frequent lies between 1000 to 2000 m which are densely populated valley folds of the Himalayas. Some studies derived that mostly cloudbursts occur and are expected to occur in low elevation high-temperature zones of topoclimate regimes of the Himalayas which receive low rainfall and exhibit high land surface temperature ranging from 18° C to 28° C in July and August. This study provides a comprehensive understanding of the physical driving processes such as atmospheric circulations, thermodynamics, orographic lifting, and its distribution based on analytical and geospatial approaches to know the triggering factors of cloudburst events and invigoration of the convection process.

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Correspondence to Hemant Singh .

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Singh, H., Varade, D., Mishra, P.K. (2023). Cloudburst Events in the Indian Himalayas: A Historical Geospatial Perspective. In: Singh, A. (eds) International Handbook of Disaster Research. Springer, Singapore. https://doi.org/10.1007/978-981-19-8388-7_192

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