Day time cold temperature in Chennai and rainfall

The easterly wave progression is vivid. 

The low in the lower latitude [10 DEG North] is oscillated in the progress of easterly wave. 

Since it is wave type propagation only NON convective clouds are predominant. The movement is tossed by troughs & crusts. [(Alternate) west-east shift of cloud formation and east to west dissipation of cloud band]  This will persist for another 48 hours.

This will enhance the rainfall for Chennai city.

The cold easterly trough brought day time cold in north coastal Tamil Nadu ,especially at Chennai, and the stratus clouds gave moderate to heavy rainfall.
The crest in the west will be moisturized to give [dense] fog in North  western parts of TamilNadu

Chennai - 8:18am, light rain continue over Polichalur zone. So far IWM Polichalur has recorded 13.5mm of rainfall.

S-W Bay LOW "95B" has intensified slightly and drifted North, now positioned at 9.1N , 83.3E ... http://ow.ly/i/85t2x 

7:30am, visible shot shows, most of convective activity is over N,N-W,N-E from center of 95B... http://ow.ly/i/85t5p 
8:10am, more rain pushing towards central,N Tamilnadu coast, Chennai ... this time it'll heavier ... http://ow.ly/i/85taf 

As of now, In next 2 days, 95B is expected to drift North along Tamilnadu coast as a Well marked LOW.. http://ow.ly/i/85tiL

Posted Sunday 28th Night:

BB-15 !The sysytem now as a Low at 7.7N and 84E, is around 1006 mb. Seeing the behaviour of the upper level winds, I expect this system to deepen stage wise to depression and track towards the TN coast. BB-15 is then expected, after traking along the coast, to weaken after Monday and fizzle out around 15N in the Bay.

29th December ; Heavy to Moderate Rainfall is expected : Along the North TN Coast. ( Chennai: Around 40-45 mms 29th Morning- 31st Morning). 
Light rains in Central TN.
30th : Heavy to Moderate Rains in Coastal AP. Moderate Rains in Coastal Odisha, TN and Kerala. Drizzles in Bangalore.

New Year EVE: 31st December: Heavy Rains in Coastal AP/Odisha. Vizag: Around 40 mms 30th morning-1st Morning). 
Moderate Rains in Interior Odisha and Parts of South Chattisgarh (Raipur: Upto 5 mms)).
Light showers in Aurangabad  , Ahmednagar, Jalna and Western Vidarbha (Akola). (Rains in Central India due to an inland trough ). Drizzles in Bangalore.

Very Cilly Night with around freezing temperatures in Punjab/Haryana, parts of NCR and Rajasthan.  
Mumbai will be pleasant and windy in the evening. Low at Santa Cruz around 16c and 19/20c at Colaba. Partly cloudy next few days.
Goa will be partly cloudy with light showers in the night or 1st morning.
Pakistan Northern plains and Sindh to face very cold temperatures from 31st for 2/3 days. Around freezing in Sindh plains and Punjab.

New Year: 1st January 2015: Heavy Rainfall in Coastal West Bengal and adjoining Odisha. 
Moderate to light showers and hails in Marathwada (Aurangabad : Around 20 mms in 2 days. Very cold day)), West Vidarbha (Akola), North Maharashtra (Hails) (Pune/ Nasik), Interior Karnataka (Belgaum) ( Bangalore: Showers on 1st around 15 mms in some parts), Hyderabad, Parts of South Gujarat Coast (Surat: Upto 3 mms), Baroda).
Cold Wave in all of Northern regions continue and intensify from 2nd January. Gujarat and Kutch get cold from 1st January.

From vagaries

Chennai - 6:40pm, Strong drizzle now. First rain due to S-W Bay LOW "95B". More coming up around midnight, early hrs. http://ow.ly/i/85exT 

6:30pm, Deep convective activity seen around S-W Bay LOW "95B" and over its Northern band ... http://ow.ly/i/85eCe 

Karaikal - 2pm, it's been drizzling continuously with an occasional moderate shower.

RT @Serene_Meadows: @weatherofindia Delhi all fogged out this morning. Easily the worst fog of this season. 8:22am

RT @rajugana: @weatherofindia Bangalore 10.00am.. Foggy, chilly, lazy Sunday..cloudy skies..a pic http://t.co/4SHGjOq2yu

From morning, showers seen over Central coast Tamilnadu... Now rain slowly creeping to N coast Tamilnadu.

Chennai - 1:15pm, again a cloudy day and bit humid, warm than yesterday. Rain nearing from SE, drizzle will push in after 4pm.

95B - S-W Bay Low - What next ??

At present, a low,mid-level circulation is seen over a Sea level LOW pressure system over S-W Bay near to East Srilanka coast.

Present pressure is around 1004mb
And location is 7.5N , 83.3E.

GFS model doesn't expect the system to deepen to Depression (or) move North or N-W before Monday morning. And after that, it'll deepen to a Depression or Well marked LOW and drift into central Tamilnadu coast on 30-Dec.

NAVGEM model almost similar to GFS, expects the system to become Well Marked LOW on Monday and drift into central Tamilnadu coast on 30-Dec.

On Tuesday, 30-Dec... an upper-level W.D trough is expected to drop upto 21N along S Pakistan, W,N-W Gujarat. This is expected to drift East into India in subsequent days, this can make the S-W Bay system to drift North initially and then N-E along S-E coast of India into N Bay.

According to GFS, Showers will reach central,N Tamilnadu coast and even Chennai after morning or noon of Sunday, 28-Dec.
On Monday, HEAVY rain expected along central,S-E,N Tamilnadu coast and moderate rain into Chennai.

Weather Instagram at December 27, 2014 at 07:29PM

Mahabalipuram - 3:38pm, slightly foggy, mild, breezy and cloudy. #weather

from Instagram

RT @rajugana: @weatherofindia Bangalore 3.45pm, After a hot and breezy day, now the sky appears partially cloudy with high broken clouds...

Important update regarding SW bay low and circulation 95B, and its impact for Tamilnadu... Coming up at around 9:30pm !