May 18, 2016 at 08:18AM

#Chennai - 91B has moved further North. Now (7:50am) NE from city at 140km. #iwm ... http://pic.twitter.com/guLa2ubsOK

— Indian Weather Man (@weatherofindia) May 18, 2016

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May 18, 2016 at 08:04AM

RT @ChennaiRains:
Chembarambakkam near #Chennai records second straight 10 cms #Chennairains http://pic.twitter.com/scxZqjBMWN #iwm

— Indian Weather Man (@weatherofindia) May 18, 2016

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May 18, 2016 at 06:31AM

#Chennai and N-coast Tamilnadu.. Rainfall will reduce as 91B is moving north from city's latitude.
Threat persists for S-coast Andhra! #iwm

— Indian Weather Man (@weatherofindia) May 18, 2016

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May 18, 2016 at 06:27AM

@rsGiri @IWMpolichalur >>
Unfortunately, our rain gauge stopped working at the wrong time :-(
Yes, pressure dropped to 996mb at 3:42am #iwm

— Indian Weather Man (@weatherofindia) May 18, 2016

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May 18, 2016 at 06:23AM

RT @TOICitiesNews:
Chennai faces deluge threat, NDRF called in https://t.co/11pLHap9Ww #iwm

— Indian Weather Man (@weatherofindia) May 18, 2016

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May 18, 2016 at 06:15AM

Chennai - 5:30am, the Eye of 91B is parallel, east to city at 120km. Moving away. #weather

from Instagram

May 18, 2016 at 01:17AM

Chennai - 1am, winds are from North. showers seen along coast are sliding South, not pushing inland. #weather

from Instagram

May 18, 2016 at 01:02AM

#Chennai - RADAR at 12:40am, center of 91B can be plotted at around 120km SE / ESE of city .. #iwm .. http://pic.twitter.com/EhLR1xGXYd

— Indian Weather Man (@weatherofindia) May 17, 2016

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91B - tracking north along N-coast Tamilnadu and intensifying

5:30pm, 91B is a Depression with pressure around 996mb (as of GFS) and drifted North along Tamilnadu coast... https://d2jhuj1whasmze.cloudfront.net/photos/original/jt5yX.gif

Now the 91B is expected to travel thru less shear zone, so its intensity will (or) can increase in next 12hrs... https://d2jhuj1whasmze.cloudfront.net/photos/normal/jt5ZA.jpg
By early morning, 91B can become Deep Depression (or) a marginal Cyclone and track close to #Chennai .. https://d2jhuj1whasmze.cloudfront.net/photos/normal/jt6dB.jpg
91B - GFS expects the system to become a marginal Cyclone at around noon of 18-May, very near to #Chennai .. https://d2jhuj1whasmze.cloudfront.net/photos/normal/jt6xF.jpg

Today afternoon, 91B is expected to track North along #Chennai coast and push to S,central-coast Andhra !

#Chennai - can experience HEAVY rain and high winds during next 12hrs.

Especially high winds after 5/6am.

#Chennai , N-coast Tamilnadu and S-coast Andhra to experience heavy rain & high winds during next 12hrs... https://d2jhuj1whasmze.cloudfront.net/photos/normal/jt7Aj.jpg

#Chennai - 12:26am, Pressure at 998.7mb, and a band of heavy rain is nearing coast ... https://d2jhuj1whasmze.cloudfront.net/photos/original/jt8bu.gif

Upper-level Wind profile ..

It's turning North upto 1km above sea... meaning 91B is nearing Chennai latitude and moving North.

"IF" 91B continue to track North along Chennai,N Tamilnadu coast.. apart from 1 or 2 heavy rain, NO significant rain expected for these zone.

"IF" 91B drifts NW towards #Chennai, then city can expect "HEAVY" widespread rain with high winds from 4am to 12noon.

@Karthikganesh29 

GFS suggests a Northerly track for 91B during next 12hrs- meaning 1 or 2 heavy rain along coast for Chennai, N TN,S Andhra.

This is the GFS forecast of rain along Chennai, N-coast Tamilnadu and S-coast Andhra during next 24hrs... https://d2jhuj1whasmze.cloudfront.net/photos/normal/jtawB.jpg

May 17, 2016 at 04:54PM

Chennai-4:49pm, pressure drop continues, 998.8mb.
More Rain will push from Sea and may develop over city itself #iwm http://pic.twitter.com/9ABujFSMyq

— Indian Weather Man (@weatherofindia) May 17, 2016

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