Indian Weather Man (IWM)

Now, the S-W Bay circulation is seen along S,S-E Srilanka ... http://ow.ly/i/7JBgc 

GFS expects this circulation to move North upto S-E,central-coast of Tamilnadu in next 24hrs... http://ow.ly/i/7JBjR 
By Saturday, an easterlies trough will be established along central,N-coast Tamilnadu and a weak circulation over Gulf Mannar.
This is how it'll look like on Saturday morning ... http://ow.ly/i/7JBnO 

By evening today into Friday, HEAVY rain expected over S,S-E-coast and central coast (below 12N) Tamilnadu ... http://ow.ly/i/7JBsy 
1:30pm, central,S-E Tamilnadu is already cloudy with some moderate showers around ... http://ow.ly/i/7JBuS 
HEAVY rain alert for S-E,central-coast of Tamilnadu on Friday, Saturday !
and
Afternoon T showers for S,central Tamilnadu.

For N-coast Tamilnadu, Chennai and S Andhra coast...
Moderate Showers expected on Friday.
And
Heavy expected to push in on Saturday.

On Saturday/Sunday, the circulation, LOW is expected to push into Tamilnadu coast !