UAC in South Bay will descend as a Low, (BB-11) by the 14th of November, around the 8N and 85E region, East of sri Lanka. The system, BB-11 will move NW towards the TN coast as a depression.
Rainfall increasing progressively along TN coast from 15th, and in Chennai from 15th/16th. Centre of the system will be off the TN coast on 16th...
As mentioned on 7th, another Low forms around the Andaman region, about 93E. The 2 system can form a strong trough. (Usually called a trough "in sympathy").
The tracking of BB-11 and BB-12 will depend on the tilt of the trough.
Vagaries reads the situation as BB-11 moving into TN as a depression..