W-central Bay LOW "98B" persists today ... http://ow.ly/i/6UJ3t 
Low,mid-level circulation of "98B" can be seen over N-W-central Bay ... http://ow.ly/i/6UJ5Z 

Here's a 700hpa analysis plot of "98B" and remnant of Typhoon " kalmaegi " ... http://ow.ly/i/6UJjE 

3pm, T showers popping again over central,N-E Andhra, N Jharkhand, central Bengal ... http://ow.ly/i/6UJqC 

GFS not expects the LOW "98B" to intensify, instead it'll slowly drift N-N-W upto Odisha, S Bengal coast and weaken http://ow.ly/i/6UJSW 
Meanwhile, the 500hpa circulation of 98B near S Andhra coast, Chennai is expected to persist till 19-Sep ... http://ow.ly/i/6UK6X 

Low-level trough from central Pakistan to S Gujarat coast persists and will till 19-Sep ... http://ow.ly/i/6UKMy 

Before morning of 18-Sep...
Scattered moderate T showers for N,N-E,N-central-coast Tamilnadu, #Chennai, S,central Andhra, S-E,E Karnataka.
Early hrs of 18-Sep...
S,central Kerala coast can get scattered showers.

18-Sep, noon, evening...
Scattered rain over S,central Odisha, central Bengal, N,N-E Karnataka, central Andhra.
18-Sep, evening...
Heavy, scattered T showers over Odisha, Jharkhand, W,S-W,N-W Maharastra, N,N-W,central,S Karnataka http://ow.ly/i/6UL3u 
18-Sep, again, T showers expected over N,N-E,N-central Tamilnadu, #Chennai, S,central Andhra ... http://ow.ly/i/6UL6q 

Weather Instagram at September 17, 2014 at 04:13PM

#chennai - 3:30pm, partly cloudy and warm so far. Today again after 7pm rain activity will start due to circulation near city. #weather

from Instagram

#Chennai - Less rainfall yesterday...
Nungambakkam = 0.7mm
Airport = 1.3mm
IWM Polichalur = 0.9mm

4pm, T showers seen over N-central,N-central-coast Tamilnadu ... http://ow.ly/i/6UIYn 

#Chennai - 10:45pm, lots of mini fast moving showers seen over W,SW,S from city. Light rain will continue to push into city till early hrs.

RT @sanjeevnaique: It's heavily raining here in Margao in south Goa at 9.20 pm @weatherofindia @weatherchannel @weatherofpak @naikap

5:30pm, HEAVY T showers over N,central,N-E Andhra, scattered over N,central Chatisgarh... http://ow.ly/i/6U23D 

Before morning of 17-Sep...
Heavy, scattered T showers expected over S,central Maharastra, N,N-E,E karnataka, N,central,S, Andhra.

17-Sep, noon, evening...
Heavy T showers for W,N-W,S-W Maharastra ... http://ow.ly/i/6U5k8 
17-Sep...
Heavy, scattered rain again over N,N-E Andhra, S,central Chatisgarh, Odisha, Jharkhand and into S Bihar.
17-Sep, evening, late-evening...
T showers for S-E,E,N-E Karnataka, central Andhra, N,N-E,N-central-coast Tamilnadu and Chennai.
Less rain again along W,S-W coast (Maharastra, Karnataka and Kerala) of India.

#Chennai - Rainfall accumulation RADAR plot shows... HEAVY rain over W,S-W,S,N-W from city and over North chennai.. http://ow.ly/i/6TTZ9 
#Chennai - Rainfall till 8:30am today...
Nungambakkam = 21.4mm
Airport = 24.8mm
IWM Polichalur = 25.2mm

Before early morning of 17-Sep, scattered moderate rain expected for N,N-E Tamilnadu and Chennai.
Heavy for S,central Andhra.

Bay LOW - 98B

Today, a LOW has formed over N-W-central Bay ... http://ow.ly/i/6TTsV 
The Bay LOW is marked and tracked as "98B".
Presently it's just a Low Pressure Area.
Less intensification forecast by GFS model !

GFS suggests that "98B" is expected to persist weakly over N-central Bay and may push into Odisha coast on 19-Sep. http://ow.ly/i/6TTG3 
On 18/19-Sep, the mid-level circulation of LOW is expected to be near to N-E,central Andhra coast ... http://ow.ly/i/6TTJ7 
While the upper-level (500hpa) circulation is expected to be along #Chennai, S Andhra coast on 18/19-Sep ... http://ow.ly/i/6TTL8 

1:30pm, T showers popping over N,central Odisha, N-E Madhyapradesh, N-E Andhra, S,N-E Bihar, S Bengal ... http://ow.ly/i/6TTQV 

#Chennai - 6:58am, a wet morning. Drizzled All night and even now in Polichalur zone. Rainfall 23.7mm and temperature is 24.5 C.

Vagaries of the Weather now on Twitter...Please follow @VagariesWeather

#chennai - 10:40pm, strong drizzle continue over polichalur zone. Rainfall so far 18mm and temperature is 23.2C. Long drizzle ahead.