Today (30.11.2021)
Thunderstorm with Heavy rain is likely to occur at isolated places over Kanyakumari and Tirunelveli districts.
Thunderstorm with Light to moderate rain is also likely to occur at many places over rest Tamilnadu, Puducherry and Karaikal.

Tomorrow (01.12.2021)
Thunderstorm with moderate rain is likely to occur at a few places over South Tamilnadu and Western ghat districts.
Thunderstorm with Light to moderate rain is also likely to occur at one or two places over Coastal Tamilnadu, Interior Tamilnadu Puducherry and Karaikal.

HEAVY RAINFALL WARNING:

Today(30.11.2021): Heavy rain is likely to occur at isolated places over Kanyakumari and Tirunelveli districts.

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 generally cloudy. Light to moderate rain is likely to occur in some areas.

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