Flash floods are among the world’s deadliest natural disasters with more than 5 000 lives lost annually. Their social, economic and environmental impacts are significant. Accounting for approximately 85% of flooding cases, flash floods also have the highest mortality rate among different classes of flooding, including riverine and coastal. Flash floods differ from river floods in their short time scales and occurrence on small spatial scales, which makes flash flood forecasting a different challenge from large-river flood forecasting.
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Normal to above normal rainfall is most likely during the 2022 southwest monsoon season (June – September) over most parts of the South Asia, according to an authoritative seasonal forecast from the South Asian Climate Outlook Forum.
The World Meteorological Organization and India Meteorological Department (IMD) have held a two-day regional workshop on the proposed Hydrological Status and Outlook System (HydroSOS) in the Ganga Brahmaputra Meghna (GBM) River Basin.
Activities on capacity building and improvements of early warnings of flash floods – one of the deadliest natural hazards, in South Asia region are advancing with the South Asia Flash Flood Guidance System (SAsiaFFGS) Radar Hydrology Training.
Climate change has accentuated natural hazards, including flash floods caused by melting of snow and ice in many regions of the world. The Himalayas, which are the third largest deposit of ice and snow in the world after Antarctica and the Arctic, are heavily impacted. This was highlighted by a disaster in February in Uttarakhand in the Indian Himalayas, after a part of the Nanda Devi glacier broke off and collapsed causing a massive flood in the Rishi Ganga /Dhauliganga river. This destroyed two hydropower plants, burst open dams, and led to a large number of casualties and widespread environmental damage in an ecologically fragile area.
Normal to above normal rainfall is most likely during the 2021 southwest monsoon season (June – September) over most parts of South Asia, according to an authoritative seasonal forecast from the South Asian Climate Outlook Forum (SASCOF) released on 27 April.