A study of maximum wind surface in the easterly jet stream over India during July 1966

Abstract

. In this paper a study is made of the level of maximum wind of the easterly jet stream over India using July 1966 upper wind data. It is found that, in general during the month, the level of maximum wind increases in height from about 13.1,5 km near Trivandrum latitude to about; 16.18 km at about 15.20 degrees North latitude and towards further north decreases to at times as Iowa height as 12.13 km near Allahabad-Delhi latitudes. Many of the 200.mb charts of July 1966 show two distinct jet axes 10.15 degrees latitude apart, the northern jet axis being of very limited longitudinal extent. The author finds that double jets occur on 200-mb charts due to the inverted V-shaped nature of the north south vertical profile of the level of maximum wind. A tentative schematic diagram of atypical north south vertical section of the easterly wind field of July 1966 is presented in the paper.