Owing to the depression that has formed in the bay of bengal, which is also expected to form into a deep depression with time, we are likely to see heavy rain in chennai from tonight or tomorrow. The image attached shows the rainfall accumulation for 21st November. Get ready with your umbrellas and rain coats to enjoy the rain. Source : Tamilnadu weatherman facebook page
Owing to the cyclone Gaja formed at the Bay of Bengal, chennai will start recieving rains from tonight or early morning tomorrow. Chances of rain today is very low. Also due to the nearing cyclone, the day will be more windy than usual. Source : Rainstorm Twitter handle and windy.
The following rain prediction image shows the recently modified track of cyclone Gaja after the loop formation and change in path of the cyclone that happened lately. The image shows that rains for Chennai will be fulfilling on 15th of November. Image source : JTWC ( Joint Typhoon Warning Centre)