Study of certain sudden weather developments Over central India in winter

Abstract

Most of the winter rains In central India are associate with systems Induced by western disturbances and, sometimes, as an effect from the moving cyclonic systems In the extreme south of the country, But, there are instances of sudden winter wet spells localised in the central parts of the country in the absence of any such system, This study shows that, some of the sudden widespread rains in central India are actually associated with highly amplified lower tropospheric easterly waves from the Bay of Bengal progressing across the Peninsular India and bringing in considerable moist air into the dry regions of the central India to cause vigorous weather there, Isentropic method has been used to locate the ascending moist air around central India and determine its vertical velocity. It has been shown that this vertical lift is further augmented by the favourable position of an upper tropospheric jet stream located in the area in each case, thus causing vigorous  convective activity.