<P> The 2017 North Indian Ocean cyclone season was a below average event in the annual cycle of tropical cyclone formation . This season produced only three named storms, where one only intensified into a very severe cyclonic storm . The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with the two peaks in May and November . These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean . The season began with Cyclone Maarutha on April 15, and ended with a deep depression on December 9 . </P> <P> The scope of this article is limited to the Indian Ocean in the Northern Hemisphere, east of the Horn of Africa and west of the Malay Peninsula . There are two main seas in the North Indian Ocean--the Arabian Sea to the west of the Indian subcontinent, abbreviated ARB by the India Meteorological Department (IMD); and the Bay of Bengal to the east, abbreviated BOB by the IMD . The official Regional Specialized Meteorological Centre in this basin is the IMD, while the Joint Typhoon Warning Center (JTWC) releases unofficial advisories . On average, three to four cyclonic storms form in this basin every season . </P> <P> The season officially had an early start compared with the last two seasons, with the formation of Cyclone Maarutha over the Bay of Bengal in mid-April . Cyclone Mora, formed in late May over the Bay of Bengal . At its peak intensity, it was equivalent to a marginal Category 1 hurricane on the Saffir - Simpson hurricane wind scale . The cyclone produced severe flooding across Sri Lanka, India, Myanmar and Bangladesh and caused 15 deaths directly and 208 deaths indirectly . The floods persisted in Bangladesh since a Deep Depression over Bay of Bengal made landfall and killed 156 people in Bangladesh . A depression formed in northwestern Bay of Bengal and produced torrential rainfall . It was followed by a depression over Jharkhand which killed 70 people in West Bengal . Under the influence of strong monsoon surge a disturbance developed over Bay of Bengal travelled westwards and intensified to an unnamed depression . It also affected neighboring Karachi in Pakistan . A strong monsoon surge prevented formation of systems until a deep depression formed over West Bengal in October and caused heavy rainfall . A couple of depression formed between mid October and November which continued the rain spell causing destruction of life and property . Very Severe Cyclonic Storm Ockhi formed in early December and wreaked havoc in the countries where it impacted . It was equivalent to a strong Category 3 hurricane on the Saffir - Simpson scale at peak intensity . The twin storm of Ockhi was a deep depression which originated in Bay of Bengal while its counterpart was in Arabian Sea . </P> <Table> <Tr> <Td_colspan="2"> Cyclonic storm (IMD) </Td> </Tr> <Tr> <Td_colspan="2"> Tropical storm (SSHWS) </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Duration </Th> <Td> April 15--April 17 </Td> </Tr> <Tr> <Th> Peak intensity </Th> <Td> 75 km / h (45 mph) (3 - min) 996 hPa (mbar) </Td> </Tr> </Table>

Cyclon formed in bay of bengal may 2017