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...

Asian summer monsoon rainfall affecting Indian Subcontinent and other Asian regions is the product of the global and local anomaly in the general circulation features. Awareness of the need to understand and predict the monsoon over India have recently generated much interest in the possible relationships between the amount and distribution of Indian monsoon rainfall and antecedent regional and global features. A strong cross-equatorial Low Level Jet-stream (LLJ) with core around 850 hPa exists over the Indian Ocean and south Asia during the boreal summer monsoon season, June to September....