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RT @TraderIndian: #TamilNadu Rains @weatherofindia . https://t.co/vUurgBxEIt #iwm
Taken from Weather of India

November 14, 2015 at 01:39PM

97B, WML - WRF model also suggests a landfall just north of point Calimere around noon, 16-Nov. #weather

from Instagram

November 14, 2015 at 12:45PM

97B - GFS expects the circulation, Low to make landfall along Point Calimere on night of Sunday into 16-Nov. #weather

from Instagram

November 14, 2015 at 11:49AM

Tirunelveli - 11:40am, heavily cloudy with mild drizzle continue. #weather

from Instagram

November 14, 2015 at 09:38AM

Chennai - 9:30am, a moderate shower may sweep into S,S-central suburbs of city in next 1 hr. #iwm

November 14, 2015 at 09:26AM

97B - now near SE of srilanka. Central coast Tamilnadu getting round 1 heavy showers. #weather

from Instagram

On Thursday Late night  and and early Friday 13th  morning, the regions around Chennai received unexpected very heavy rains. Amounts of upto 47 cms was recorded, and many a usually drier lakes received a bounty, and filled up the water reserves.

The reason for this, according to me, was due to the "divergence" in the 200 jet streams, almost over the affected areas.
Where divergence (evacuation of mass) occurs in the upper levels, rising motion result. Convergence and divergence in a jet streak is caused by an imbalance of forces as a parcel accelerates into a jet streak then decelerates out of the jet streak. 
This could have created a Lower level small Vortex.
From Vagaries

97B - Next LOW over S Bay - Oh Not Again !

Next LOW has popped over S Bay and tracked as 97B ... https://d2jhuj1whasmze.cloudfront.net/photos/normal/erfNB.jpg
97B, at present is slowly consolidating ... and expected to drift West ... https://d2jhuj1whasmze.cloudfront.net/photos/normal/erfZx.jpg

By Sunday, 97B is expected to become a WML and track W/WNW towards E / NE Coast of Srilanka ... https://d2jhuj1whasmze.cloudfront.net/photos/normal/erg81.jpg
97B is expected to make landfall along central-coast Tamilnadu (cuddalore again) on Monday, 16-Nov, evening ... https://d2jhuj1whasmze.cloudfront.net/photos/normal/ergfp.jpg

Today, evening its going to be HEAVY rain day for S,SE coast Tamilnadu.
HEAVY rain alert for S-tip Tamilnadu before morning of 14-Nov.

Due to 97B, heavy rain are expected to be back for central coast Tamilnadu from night of 14-Nov... https://d2jhuj1whasmze.cloudfront.net/photos/normal/erhjq.jpg

2:15pm, Moderate rain persists over belt from Vellore to Mahabalipuram and South extreme suburbs of Chennai ... https://d2jhuj1whasmze.cloudfront.net/photos/normal/erhu0.jpg
2:30pm, Chennai and South suburbs... more rain may push in from Sea in next 1hr... https://d2jhuj1whasmze.cloudfront.net/photos/normal/erhC2.jpg

Chennai and Rain - OMG

Egmore is experiencing heavy rains. Will schools work tomm? @weatherofindia # chennai #rains

— subha j rao (@subhajrao) November 12, 2015

It's been pouring non stop in chennai since last night. It's now coupled with thunder and lightening. @weatherofindia @chennaiweather

— archana subramanian (@archvivekh) November 12, 2015

@weatherofindia 630am pouring in Mugalivakkam. #chennairains pic.twitter.com/JZkglKZgbd

— Arjuun (@arjuunsraman) November 13, 2015

Heaviest spell today 5.30 -7.30 am non stop rains neighbor car almost drowned @weatherofindia #Virugambakkam Chennai pic.twitter.com/3eoMjzrymg

— S.Ranganathan (@rangats) November 13, 2015

Overnight Rains #Chennai #CanalRoad #Kilpauk @diparamakrishna @weatherofindia @chennaiweather @SkymetWeather pic.twitter.com/f7152dPLxm

— NaveeN் (@naveenkumars84) November 13, 2015

@naveenkumars84 @diparamakrishna @weatherofindia @chennaiweather @SkymetWeather Round 2 chennai pic.twitter.com/0rFvdAA0Nk

— Manoj (@Manoj2Menon) November 13, 2015

Kanchipuram has recorded 41.1 cm of rain. Heavy spell to continue for next 48 hours #chennairains @NewsX pic.twitter.com/1BRG7GKnA6

— Lokpria (@Lokpria) November 13, 2015

Heavy rains continue to pound #Chennai | https://t.co/OkkwMt318g #chennairains pic.twitter.com/7z8YdmxNdD

— Manorama Online (@manoramaonline) November 13, 2015

The season in which Chennai resembles Venice #chennairains pic.twitter.com/AnC5q0U7cD

— Krishnan (@tskrishnan) November 13, 2015

Check images from Chennaiites that tell you just how bad the city gets #chennairains https://t.co/ZcrRdB3SzM pic.twitter.com/ZO2sQJQMIH

— TheNewsMinute (@thenewsminute) November 13, 2015

November 13, 2015 at 01:06PM

Nagercoil - 12:50pm, moderate rain again. While showers from Chennai had moved South. #weather

from Instagram