Knowra Bhola cyclone Bhola cyclone The deadliest tropical cyclone on record struck East Pakistan and India’s West Bengal on 12 November 1970, killing an estimated 300,000 to 500,000 people.
Tropical cyclone : A rotating, organized storm that forms over tropical or subtropical waters and draws energy from warm seas. The Bhola cyclone was a tropical cyclone whose winds and rainfall drove a catastrophic coastal surge.
1970 Bhola cyclone response : The relief and recovery efforts following the November 1970 cyclone in East Pakistan. Slow and inadequate relief became a major grievance among survivors and political leaders.
North Indian Ocean cyclone season : The annual period when tropical cyclones form over the Arabian Sea and Bay of Bengal. The cyclone formed during the basin’s post-monsoon season, when severe Bay of Bengal storms occur.
1991 Bangladesh cyclone : A powerful tropical cyclone that struck Bangladesh in April 1991 and killed about 138,000 people. It caused another catastrophic surge, but improved warnings and preparedness reduced deaths relative to Bhola.
Storm surge : An abnormal rise of seawater pushed onto shore by a storm’s winds and low pressure. Its surge inundated densely populated islands and coastal areas in the Ganges delta.
1970 Pakistani general election : Pakistan’s first general election based on universal adult franchise, held in December 1970. The cyclone’s aftermath sharpened criticism of the central government just before the election.
Bay of Bengal : A northeastern extension of the Indian Ocean bordered by India, Bangladesh, and Myanmar. The storm formed over these waters before moving toward the delta coast.
Cyclone Sidr : A severe tropical cyclone that struck Bangladesh in November 2007, killing thousands and causing extensive damage. Sidr shows how evacuation and warning systems developed after the 1970 disaster.
Ganges delta : A vast river delta formed by the Ganges, Brahmaputra, and Meghna rivers along the Bay of Bengal. Its low elevation and many inhabited islands magnified exposure to the cyclone’s surge.
Bangladesh Liberation War : The 1971 conflict that led to the independence of Bangladesh from Pakistan. Anger over the cyclone response contributed to the broader political crisis preceding the war.
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