Bay will be buzzing again from Thursday,18th: Precipitation resumes for the East Coast from 22nd.

A UAC will form "in situ" in the Bay in the Central region on 18th at around 15N. The UAC will descend to sea level, track Westwards, and cross the East Coast of India in the Southern AP region around the 22nd. Rains very heavy along AP coast and interiors, but good rains all along the coast of TN also. Could be numbered by Tuesday (BB-19).

Hyderabad gets rains on Friday 22nd.

Chennai will get a break in rain intensity from Tuesday thru Thursday. 
Friday, 22nd, the rains commence again. 

On 21st November, potential Low could form in the SE Bay, South of Andaman Islands in the 7N region. Can have a good potential for further developing possibly upto DD or cyclone stage.

www.vagaries.in

A fresh W.D trough is expected to reach N Pakistan, W,N-W Kashmir on 20-Nov ... http://ow.ly/i/3Kw1k 

4:30pm, Heavy rain continue along S,central Andhra coast, Showers also seen over central,S Kerala, S Tamilnadu .. http://ow.ly/i/3Kw7g 

RT @Ask_Someone: @weatherofindia 1545 hrs, No Rains in last 6-7 hrs, Intermittent Clouds, Often Sunny in SW Bangalore regions, @rajugana 

#Chennai - 5pm, mini sharp showers may push into city, suburbs in next 1.5hrs

COLD NORTH India, today morning Adampur (Punjab) records 5.8º C

#Chennai - Rainfall till 8:30am today, Nungambakkam = 80.4 mm, Airport = 123.9 mm and IWM station, Polichalur = 138.3 mm

#Bangalore - 1:49pm, "Raining in CHIKKABETTAHALLI zone"

#Chennai - 2pm, Warm, Temperature around 30 C.

More chance of rain in next 2hrs.

RT @rajugana: Bangalore 8.30am, Wet Sunday; rained overnight and Now, Dark clouds lingering around, sky pic. http://t.co/emMxgH6KgF 

#Chennai - 11:26am, Showers now stopped over most of S,W,E suburbs. Getting WARM !

Next 24hrs, More rain ahead for #Chennai, N coast Tamilnadu and S coast Andhra

The remnant of Depression is seen as a weak circulation over N-W Tamilnadu, Nilgiris, N Kerala and S-W Karnataka.. http://ow.ly/i/3Ksvh 

The circulation may emerge over Arabian sea in next 24hrs or fizzle out over land itself.
Before Monday evening, more Heavy rain expected along S Andhra coast, N Tamilnadu coast and #Chennai.
During next 24hrs, Scattered Showers expected over S,S-W,W Karnataka, Kerala, W,N-W,S,S-central Tamilnadu as well.

Chennai rain and the inland low

1.     After crossing coast the system moved in North-NWly direction and continuously draw wind from SEly direction through Chennai
2. This lead to incessant rain in Chennai

17.11.2013 RF [> OR =125.0MM]
SN	STATION	RF in mm
1	MAYILADUTHURAI	220.0
2	TRICHY JN	144.0
3	GOLDEN ROCK	138.4
4	SATTANUR DAM	127.8
5	MANALMEDU	127.0
6	VANDAVASI	126.0
7	CHEMBARAMBAKKAM	125.0

Super Sunday morning for #Chennai, IWM station records 128.1mm till 8am

Check http://chennai.indianweatherman.com/  for live #Chennai weather from IWM weather station at Polichalur.

RT @joesat: @weatherofindia #palavakkam 6am Continuous rain pounds and no wind #Chennai

RT @saisowsen: @weatherofindia 07:30am - CONTINUOUS rain all night, still pouring at #PALLIKARANAI #Southchennai 

RT @joesat: @weatherofindia #Chennai #palavakkam 7:30 The intensity of the rain has just increased a few notches. Thank God there's Internet 

#Chennai - 7:48am, Still raining now over Polichalur zone. So far IWM station has recorded 132.3 mm during past 24hrs http://ow.ly/qTAyT 

#Chennai - HEAVY rain continue from midnight, Satellite show rain is concentrated only along S Andhra, #Chennai, N Tamilnadu coast

RT @NTSHAMZ2010: @weatherofindia Heavy rain in Madambakkam since 7 a.m. it rained heavily overnight too! #Chennai (7:50am)

Here's the 7am satellite IR,... showing showers only along zones near #Chennai ... http://ow.ly/i/3Kqju 

#Chennai - 7:45am, RADAR shows more waves of HEAVY rain ahead coming into city, suburbs from E-S-E and S-E... http://ow.ly/i/3KqnW 

Chennai - 11:45pm, heavy downpour for the past 30min over Polichalur zone

RT @saisowsen: @weatherofindia 11.30pm heavy rain in #pallikaranai #southchennai

RT @rajugana:  Bangalore 9.30pm, Continuous drizzle since AN, just enough to wet the earth, intensity starts increasing since 9.00pm..

Aftermath of land fall

• When the cloud mass is crossing land as there is NO organised structure [i.e centre, wall clouds, outer band and defined cyclonic circulation etc] centre of crossing may not be there or well defined.  Instead the time that the cloud mass, preferably the lowest pressure point, crosses a point over the coast  is then the land fall. 
• Karaikal reported westerly / 18 knots or so at 03Z:  So the system and its lowest pressure point may be at North of Karaikal at 0830 hrs IST. Continuous monitoring of pressure in between Karaikal & Cuddalore is not possible as per currently available of data.

1.  State Government should provide sensitive / precision Aneroid Barometer  or automated pressure instrument to each coastal hamlet in the coast,  The task can be entrusted with heads of fisherman./ cyclone shelter managers
2. SMS VOICE alert in vernacular language about the cyclone should be disseminated to each fisherman.  State Fisheries Department in coordination with India Meteorological Department, mobile service providers, voluntary agency and other stake holders should initiate this move for the benefit of fisherman. The data base of mobile numbers of all interested fisherman should be raised.
3. IMD should install high wind speed recorders at all vantage locations in the coast apart from installation of adequate AWS along the coast.

Depression is inland over central Tamilnadu coast.

12:30pm, "30W" as depression has crossed into central Tamilnadu coast ... near Karaikal.
You can see the center of the system in both the following images.
RADAR image

Visible satellite shot at 12:30pm

pras_ja9:31am via Twitter for Android

@weatherofindia Raining heavily since 6 am in Pondicherry..

10:13am via Web

@weatherofindia The eye of depression is almost over land now. No significant rains or wind in Chennai! Only a persistent drizzle

ImSandeshJain10:14am via Twitter for Android

@weatherofindia Raining very heavily. Chennai South. #Velachery

joesat10:22am via Plume for Android

@weatherofindia #palavakkam 10 am Consistent showers and temperature is down at least 2 degrees than normal

jj_clinton10:27am via Twitter for Android

#Ramanan is right this time..been raining here (chennai sholinganallur) since strday ngt..now some heavy showers..!! @weatherofindia

ensabraham12:16pm via Mobile Web (M2)

@weatherofindia
12:10pm Its raining in Perundurai,Erode,Tamil Nadu..

1:15pm, the Northern band of the Depression is giving heavy rain to Mahabalipuram coast, Vandavasi and madurantakam belt of Tamilnadu.

Heavy and widespread rain ahead for Nilgiris, N-W,central,N Tamilnadu and into S Andhra, S Karnataka during next 18hrs.

#Chennai - will continue to get passing moderate intensity showers during next 24hrs.