Heavy rain and strong winds expected in Tamil Nadu's Nilgiris, Coimbatore, and Erode districts on Thursday due to a weather trough, while other parts of the state will experience moderate rainfall. Chennai: Heavy rain accompanied by strong winds is likely in Nilgiris, Coimbatore and Erode districts on Thursday, the Meteorological Department said, as a trough extending across Tamil Nadu is expected to bring rainfall to several parts of the state.