The characteristics of the troposphere and lower stratosphere during the passage of tropical cyclones have been studied in detail using the Indian MST radar located at Gadanki (13.5 N, 79.2 E), India. The winds in the troposphere and lower stratosphere are greatly affected by the passage of cyclones. Lower and middle tropospheric winds showed signs of reversal, while strengthening of winds are noted in the upper troposphere and lower stratosphere during the passage of cyclones. The vertical wind showed marked variations only when the cyclone is closest to the station. The presence...