Part of the 2003 North Indian Ocean cyclone season
In May 2003, a tropical cyclone officially called Very Severe Cyclonic Storm BOB 01[1] produced the worst flooding in Sri Lanka in 56 years. The first storm of the 2003 North Indian Ocean cyclone season, it developed over the Bay of Bengal on May 10. Favorable environmental conditions allowed the system to intensify steadily while moving northwestward. The storm reached peak maximum sustained winds of 140 km/h (85 mph) on May 13, making it a very severe cyclonic storm according to the India Meteorological Department (IMD), which is the official Regional Specialized Meteorological Center for the basin.[2] The cyclone drifted north over the central Bay of Bengal, gradually weakening due to heightened wind shear. Turning eastward, the storm deteriorated to a deep depression on May 16 before it curved northeastward and re-intensified into a cyclonic storm. It came ashore in western Myanmar and dissipated over land the following day.
In the wake of prolonged precipitation during the first half of May, the cyclone produced torrential rains across southwest Sri Lanka while stationary in the central Bay of Bengal. The storm drew extensive moisture that coalesced in the mountainous portion of the island. A station at Ratnapura recorded 366.1 mm (14.41 in) of rainfall in 18 hours on May 17, including 99.8 mm (3.93 in) in one hour. In southwestern Sri Lanka, the rainfall caused flooding and landslides that destroyed 24,750 homes and damaged 32,426 others, displacing about 800,000 people. Overall damage totaled about $135 million (2003 USD),[nb 1] and there were 260 deaths. The cyclone also produced some rainfall in the Andaman and Nicobar Islands of India and along the country's eastern coast. The storm funneled moisture away from the mainland, which possibly contributed to a heat wave that killed 1,900 people, and dropped heavy rainfall in Myanmar.
^Best Tracks Data (1990 - 2013) (Report). India Meteorological Department. Archived from the original on 2014-09-25. Retrieved 2014-04-29.{{cite report}}: CS1 maint: bot: original URL status unknown (link)
^Worldwide Tropical Cyclone Centers (Report). National Hurricane Center. 2011-09-11. Archived from the original on 2015-03-21. Retrieved 2012-08-27.
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