Chennai, Dec. 4 -- Several parts of Tamil Nadu, including Chennai and Nilgiris, are likely to witness light to moderate rainfall in the next three hours, the India Meteorological Department said on Thursday.

The IMD Regional Meteorological Centre in Chennai issued a yellow alert for various districts in Tamil Nadu, including the capital.

According to the weather department, in the light of Cyclone Ditwah, light to moderate rainfall accompanied by thunderstorms is expected at isolated places in the Nilgiris, Ranipet, Chennai, Tiruvallur, Kancheepuram and Chengalpattu districts of Tamil Nadu.

Yellow indicates severe weather spanning several days. It also suggests that the weather could change for the worse, causing disruption in day-to-d...