Today (08.12.2021)
Thunderstorm with heavy rain is likely to occur at isolated places over Cuddalore,Ramanathapuram, Delta districts, and Pudukkottai districts of Tamilnadu & Karaikal area.
Thunderstorm with moderate rain is likely at isolated places over Coastal Tamilnadu and Puducherry.
Thunderstorm with light rain is likely at isolated places over rest Tamilnadu.

Tomorrow (09.12.2021)
Thunderstorm with heavy rain is likely to occur at isolated places over Ariyalur,Perambalur, Kallakurichi, Tiruvannamalai, Toothukudi districts of Tamilnadu.
Thunderstorm with light to moderate rain is likely at many places over rest Tamilnadu districts, Karaikal area and Puducherry.

HEAVY RAINFALL WARNING:

Today(08.12.2021): Heavy rain is likely to occur at isolated places over Cuddalore, Ramanathapuram, Delta districts, Pudukkottai districts of Tamilnadu & Karaikal area.

Tomorrow (09.12.2021): Heavy rain is likely to occur at isolated places over Ariyalur, Perambalur, Kallakurichi, Tiruvannamalai, and Toothukudi districts of Tamilnadu.

THUNDERSTORM WARNING:
Thunderstorm with lightning is likely to occur at isolated places over Tamil Nadu.

LOCAL FORECAST FOR CHENNAI CITY AND NEIGHBOURHOOD:
For next 24 HRS:Sky condition is likely to be partly cloudy. Light to moderate rain is likely to occur in some areas. Maximum and minimum temperature is likely to be around 31˚C and 24 ˚C respectively.

Reference:
http://imdchennai.gov.in/tn_fc.pdf
http://www.imdchennai.gov.in/hrw_district.htm