Warning issued to some interior districts; sky likely to remain cloudy across Chennai Share Via Email | A+A A- Boys playing football as dark clouds loom over the shores of Foreshore Estate in the city on Wednesday | Ashwin Prasath By Express News Service CHENNAI: The Indian Meteorological Department (IMD) on Wednesday said Tamil Nadu and the adjoining UT of Puducherry will receive isolated heavy rainfall in the next three days, under the influence of a trough formed over Comorin area and discontinuity at lower tropospheric levels. Thunderstorms with lightning, and associated gusty winds with speeds reaching 30-40 kmph, and with moderate rain is likely to occur at many places in interior districts and over coastal districts of TN, Puducherry and Karaikal on Thursday, said the Met office.