Bhanu Kumar, OSRU, K Muni Krishna and S Ramalingeswara Rao
Keywords: Mesoscale systems, MM5, Onset, rainfall, convection
Abstract: Mesoscale systems play an important role in giving heavy rainfall episodes across India during the onset phase of southwest monsoon; these incidents are very crucial to start agriculture operations. An attempt is made in this numerically simulated study to identify intense environmental precipitation events due to mesoscale systems using a high-resolution mesoscale model (MM5) over some parts of Andhra Pradesh during 29 June to 4 July 2006. In this model authors made use of Grell cumulus parameterization, Medium Range Forecast (MRF) Planetary Boundary Layer (PBL), Explicit micro physics and five layer soil schemes are used. The model results highlight that the simulated heavy rainfall events over the study region are predicted promisingly and it is upto 80% of observational data; these rainfall amounts are further compared with 3B42RT precipitation data. Thus MM5 control simulation indicates that the intense precipitation is due to advected warm moist air at low levels onto the coast and is enhanced by the formation of a meso-beta scale low-pressure system just off the East Coast of India.
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