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 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.
It is the 50th anniversary of Cyclone Bhola, the world’s deadliest known tropical cyclone which killed up to 500 000 people in what is now Bangladesh. It prompted calls for action to prevent a repeat of such a catastrophic loss of life and ultimately laid the foundations of WMO’s Tropical Cyclone Programme.https://trello.com/b/2HvMthoS/tropical-cyclones
The South Asia Flash Flood Guidance System (South Asia FFGS) has been officially launched, ushering in the prospect of improved early warnings for a major natural hazard in one of the world’s most populated regions.
Below-normal rainfall is likely during the 2020 October – December (OND) season over the southern parts of South Asia including some parts of extreme southeastern India and most parts of Sri Lanka and Maldives, which climatologically receive good amount of rainfall during the season, according to the South Asian Climate Outlook Forum.