Day time cold temperature in Chennai and rainfall

The easterly wave progression is vivid. 

The low in the lower latitude [10 DEG North] is oscillated in the progress of easterly wave. 

Since it is wave type propagation only NON convective clouds are predominant. The movement is tossed by troughs & crusts. [(Alternate) west-east shift of cloud formation and east to west dissipation of cloud band]  This will persist for another 48 hours.

This will enhance the rainfall for Chennai city.

The cold easterly trough brought day time cold in north coastal Tamil Nadu ,especially at Chennai, and the stratus clouds gave moderate to heavy rainfall.
The crest in the west will be moisturized to give [dense] fog in North  western parts of TamilNadu

Chennai - 8:18am, light rain continue over Polichalur zone. So far IWM Polichalur has recorded 13.5mm of rainfall.

S-W Bay LOW "95B" has intensified slightly and drifted North, now positioned at 9.1N , 83.3E ... http://ow.ly/i/85t2x 

7:30am, visible shot shows, most of convective activity is over N,N-W,N-E from center of 95B... http://ow.ly/i/85t5p 
8:10am, more rain pushing towards central,N Tamilnadu coast, Chennai ... this time it'll heavier ... http://ow.ly/i/85taf 

As of now, In next 2 days, 95B is expected to drift North along Tamilnadu coast as a Well marked LOW.. http://ow.ly/i/85tiL