High Quality Content by WIKIPEDIA articles! Cyclone Sidr (JTWC designation: 06B, also known as Very Severe Cyclonic Storm Sidr) was the strongest named cyclone in the Bay of Bengal, resulting in one of the worst natural disasters in Bangladesh. The fourth named storm of the 2007 North Indian Ocean cyclone season, Sidr formed in the central Bay of Bengal, and quickly strengthened to reach peak 1-minute sustained winds of 260 km/h (160 mph), making it a Category-5 equivalent tropical cyclone on the Saffir-Simpson Scale. The storm eventually made landfall in Bangladesh on November 15, 2007, causing large-scale evacuations. 3,447 deaths were blamed on the storm.