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Cyclonic storm; marine boundary layer; thermodynamic structure; onset phase of monsoon; conserved variable; diagrams

During the period 12–16 June 1996 a tropical cyclonic storm formed over the southwest Bay of Bengal and moved in a north-northeasterly direction. The thermodynamic characteristics of this system are investigated by utilizing the surface and upper air observations collected onboardORV Sagar Kanya over the Bay of Bengal region. The response of the cyclonic storm is clearly evident from the ship observations when the ship was within the distance of 600–800 km from the cyclonic storm. This study explores why (i) the whole atmosphere from surface to 500 hPa had become warm and moist during the cyclonic storm period as compared to before and after the formation of this system and (ii) the lower layer of the atmosphere had become stable during the formative stage of the cyclonic storm.

Savita B Morwal¹ S G Nagar¹ V S N Murty² P Seetaramayya¹

1. Indian Institute of Tropical Meteorology, Pune - 411 008, India
2. National Institute of Oceanography, Goa - 403 004, India

Published

October 2006

Manuscript received

14 September 2005

Manuscript revised

31 January 2006

Accepted

10 April 2006