Synoptic systems associated with onset of southwest monsoon over Rajasthan

Abstract

An attempt has been made to identify the main synoptic features, which are responsible for onset of southwest monsoon over the two met sub divisions east and west Rajasthan for the period 1971-2004 based on modern observational technology and developed forecasting technique in the field of short-range prediction of monsoon surges. The low pressure systems (LPS) originate over Arabian Sea, especially the formation of MTC which indicates a good signature for predicting onset of monsoon, which is the prominent feature for causing onset of summer monsoon over Rajasthan. In addition LPSs form over Bay of Bengal moved in west to northwestwards direction and reach over Rajasthan and its neighbourhood region as a lopar or an upper air cycir, also brings monsoon over Rajasthan.