Cyclonic winds, cyclones: South Asia
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The India Meteorological Department (IMD) classifies cyclonic winds into three categories--cyclonic disturbance (maximum wind speed 59kmhr), cyclones (wind speed 60 to 90 kmhr) and severe cyclones (wind speed 90 kmhr or more). Cyclone data for the years 1891 to 2012 shows a seasonal pattern. The mildest of these turbulent wind systems -cyclonic disturbances -peak in the monsoon season with an average of six to seven such incidents a year. The probability of cyclones and severe cyclones, on the other hand, is highest in the post-monsoon months. The data also shows that on an average, the Bay of Bengal is hit by at least one severe cyclone and a minimum of two cyclones each year
