Easterlies continue to affect E,S-E Srilanka ... a mini circulation is seen over S-S-E Bay just above 5N.

On 25-Dec, Christmas day, this circulation is expected to become strong over South bay above 5th parallel.. http://ow.ly/i/83b92 
GFS expects this system to become Depression / Cyclone and drift N-W upto central Tamilnadu coast on 28/29-Dec.. http://ow.ly/i/83bjd 
A mid,upper-level W.D trough travelling East over North India can make the upcoming cyclone to drift N-E on 29-Dec http://ow.ly/i/83btu 

NAVGEM suggests, that circulation will pop along S-E srilanka coast, move N-W and cross central Tamilnadu on 27-Dec http://ow.ly/i/83bEX 

Remember In 2011, Cyclone Thane also started as a circulation on 25-Dec and tracked N-W then W to hit central TN... http://ow.ly/Gmx7e 

Meanwhile, next 2 days - partly cloudy, dry days and cold morning expected for N,central Tamilnadu and cloudy, warm day for S,S-E Tamilnadu.
Chennai - Morning temp expected to be around 20/21 C for next 2/3 mornings.
Day will be around 28 C, more DRY and partly cloudy.

1pm, FOGgy conditions over N Rajasthan, S Punjab and N,central Bihar ... http://ow.ly/i/82F3q 

Again, day temps across most of N,N-W,N-central India remained well below normal...
Lucknow = 13C (-10)
Delhi = 16C (-6)
Amristar = 13C (-7)

Present weak W.D system is expected to vanish in next 12hrs ... http://ow.ly/i/82FrI 
Next W.D system is expected to reach N-W,N India on Christmas day... that too is expected to be weak... http://ow.ly/i/82Fz9 

RT @Serene_Meadows: @weatherofindia Fogged out Delhi colder than Musoorie, Shimla. http://t.co/UfFY1T5Pks

RT @Serene_Meadows: @weatherofindia Fogged out Delhi colder than Musoorie, Shimla. http://t.co/UfFY1T5Pks

RT @Serene_Meadows: @weatherofindia Cold freezes North, spreads to south now http://t.co/F1tQg9bzzk

RT @SkymetWeather: #NewDelhi city enveloped in Dense #fog, atleast 12 #flights and 50 #trains delayed. http://t.co/RlktdnEiHt 

S-W Bay near S-E Srilanka coast is having a low-level circulation and easterlies is seen upto 11N ... http://ow.ly/i/81qnV 
During next 2 days... moderate rain will reach, pop along S-E,S coast Tamilnadu due to easterlies and circulation.

GFS models continue to project a consolidation of S-W Bay circulation around 25-Dec and drift N,N-W !! http://ow.ly/i/81qAu 

Chennai - Expected to have 50% cloudy days with 21 C morning during next 2 days !

Sunday morning it was COLD in Rajasthan, Churu records 5 C.
Jaipur = 5C (-4)
Udaipur = 3C (-5)
On Saturday, the day temp across N,N-W India fell...
Ambala = 10 C (-11)
Chandigarh = 9 C (-12)
Delhi AP = 16 C (-6)
Lucknow = 14 C (-10)

Sunday again there was very dense FOG from central Pakistan to central, E Uttarpradesh...
Day temps were below normal.
Sunday's below normal day temps were...
Patiala = 9.7 C
Delhi = 17.5 C
Lucknow = 16.1 C
Patna = 16.6 C

A moderate W.D is nearing N,N-W India.... The system will affect Kashmir, N Himachal today.. http://ow.ly/i/81q2x 
Snow, moderate rain, cloudy skies expected over Kashmir, N Himachal on today till noon of Tuesday.

Next, upper,mid-level W.D trough is expected to reach N,N-W India on noon, 24-Dec ... http://ow.ly/i/81q68 

Today [21 Dec] is the shortest day of the year

This Sunday, 21 December, the northern hemisphere will experience the shortest day of its year, marked at 22:03 GMT by an astronomical phenomenon known as the winter solstice - the moment the North Pole is tilted furthest from the sun as the Earth continues on its orbit.

The solstice doesn't always occur on 21 December. Sometimes it nudges into the early hours of 22 December, which will happen again next year. The hour of day also varies. Last year's arrived at 17:11. Next year's will at 04:38.

It would seem logical that after the shortest day has elapsed the mornings would start getting lighter earlier, but this isn't what happens - the mornings continue darkening until early in the new year.

In the southern hemisphere, it's exactly the opposite story. In Sydney, Australia, for example, mornings will start getting darker from the middle of December, while the evenings will continue to get lighter until early January.

So what is behind this peculiarity, which appears to fly in the face of received wisdom about the solstice - surely the shortest day should experience the latest sunrise and earliest sunset?

Well, the primary reason behind it all is that a day - a solar day to be precise - is not always exactly 24 hours.

"In fact, it is 24 hours only four times a year, and never in December," explains astronomer Stephen Hurley, who runs a popular science blog called The Science Geek. "It is at its shortest around 23 hours 59 minutes and 30 seconds, in early September, and at its longest around 24 hours 30 seconds in December."

There are two reasons why the length of the solar day varies, the first being the fact that the axis of the Earth's rotation is tilted - 23.5 degrees from vertical - and second, the Earth's speed varies because it moves in an elliptical orbit around the sun, accelerating when it is closer to the star's gravitational pull and decelerating when it is further away.

The sun therefore in effect lags behind the clock for part of the year, then speeds ahead of it for another.

"As you can imagine, it would be complete chaos if our clocks and watches had to cope with days of different lengths," continues Hurley. "So we use 24 hours, the average over the whole year, for all timekeeping purposes.

"So, as the solar days in December are on average 24 hours and 30 seconds, while our clocks and watches are still assuming that each day is exactly 24 hours, this causes the day to shift about 30 seconds later each day."

This cumulative shifting explains why the evenings draw in towards their earliest sunset a couple of weeks before the shortest day, and why the mornings continue to get darker until a couple of weeks after.

Couttesy: BBC NEWS

Present easterlies affecting Tamilnadu coast will dry up in next 24hrs.
DRY next 2 days ahead for most of Tamilnadu, except S,S-E coast !

More easterlies pushing into S,S-E Bay... a low-level circulation is expected over S-W Bay along E,S-E Srilanka on 20-Dec.
This circulation is expected to affect S,S-E,central coast Tamilnadu on Monday ... http://ow.ly/i/7ZhYb 
This upcoming circulation can bring showers upto N-coast Tamilnadu, Chennai on Tuesday !!
Most of the rain will be below 12th parallel.

Followed by this... GFS models suggest more easterlies this time with a Depression over S,S-W Bay on 23/24-Dec.
GFS expects the next LOW / Depression will cross S,S-tip Tamilnadu on Christmas day! Giving HEAVY rain on that day. http://ow.ly/i/7ZieB 

Chennai - Almost NO rain expected from tomorrow noon till Monday.
DRY days ahead with COLD mornings.

Drizzle possible on Friday before 2pm.

Weather Instagram at December 18, 2014 at 03:05PM

Chennai - 3pm, kundrathur zone just got a mini passing shower. #weather

from Instagram