The Regional Meteorological Centre (RMC) in Chennai has announced that two weather systems are likely to trigger heavy rainfall across south Tamil Nadu, particularly in northern districts like Chennai on November 29 and 30. These systems include a low-pressure area over Malaysia and a cyclonic circulation expected to develop into a depression over the South Andaman Sea. If it intensifies, it may become a cyclonic storm named 'Senyaar'. Recent torrential rains have already eliminated the seasonal rain deficit in Tamil Nadu, leading to a surplus of 5%. However, some districts still report shortfalls. The RMC has issued orange and yellow alerts for various districts as the weather systems develop, with expectations of increased rainfall intensity in the coming days.