A weak easterlies will reach N,central coast Tamilnadu and Chennai in next 14hrs... http://ow.ly/i/8lcZD 
This easterlies is expected to affect N,central coast, adjoining zones of Tamilnadu and #Chennai till Saturday morning !

Morning of Thursday.... Cloudy morning or light rain expected along N,central coast Tamilnadu and even for Chennai.
Thursday, mid-morning,noon...
Moderate rain for #Chennai, N,central coast, adjoining zones of Tamilnadu... http://ow.ly/i/8ldwQ 
Wind speed and moisture content for this easterlies is weak, so rain possibility is reduced and in some case it'll be cloudy day only !

Due to W.D.. on Thursday ...
Rain expected over #Delhi and even in #Mumbai.
Thursday, due to W.D
Heavy snow for Kashmir, Himachal.
Scattered Heavy rain for N,N-central India.
Scattered rain for E,S-E Gujarat.

12:30pm, W.D is affecting N,N-W,W,N-central India.
Heavy rain over Punjab, Himachal, Kashmir... http://ow.ly/i/8kMRQ 

Now, W.D upper-level trough is seen over Afghanisthan, adjoining Pakistan, dipping south to 20N over NNE Arabian sea http://ow.ly/i/8kN0k 
This W.D trough is expected to drift East into N-W India and weaken.
Expected to fizzle out before Saturday morning !

The low-level circulation of W.D is over S-central Pakistan .. expected to drift E-N-E into India in 48hrs weaken.. http://ow.ly/i/8kN6B 
On Sunday evening, another low-level circulation expected to pop over remnant mid-level W.D trough over S Rajasthan http://ow.ly/i/8kNcx 

During next 24hrs.. due to WD.
scattered heavy rain for Punjab, Kashmir, Himachal... into Uttarakhand, Haryana and Delhi.
Some heavy rain also for...
S,S-E,E Gujarat, S,S-E,E Rajasthan, W,N,S-W,W-central madhyapradesh... http://ow.ly/i/8kNob 
After noon of Thursday...
Scattered heavy, moderate rain for Delhi, W,S,central Uttarpradesh, N,N-W,central Madhyapradesh, E,N-E Rajasthan

Heavy rain/snow to continue over Kashmir, Himachal during next 36hrs.
Scattered rain to persist over Uttarakhand.

Weather Instagram at January 21, 2015 at 12:28PM

Kabarwala - 11:12am, awesome weather with drizzle due to WD. #weather

from Instagram

Weather Instagram at January 21, 2015 at 12:25PM

Near Moondradaippu, S Tamilnadu - 9am, sunshine with cool breeze. #weather

from Instagram

Peculiar cloud stretch

Peculiar (but somewhat common ???) rope like clouds west SW to North NE stretching to few thousand km.  Though NOT rain possible, but minimum temperature will increase somewhat along the stretch.

Weather Instagram at January 20, 2015 at 12:32PM

Coimbatore - 12:25pm, a warm day. #weather

from Instagram

10:30am, W.D slowly affecting S,S-W,W,N Pakistan and into S,W Gujarat ... http://ow.ly/i/8jT7g 
10:30am, FOG cover seen from Punjab, Haryana thru Uttarpradesh and into Bihar... http://ow.ly/i/8jT7g

#Chennai - Airport, IWM Polichalur station records 19 C today morning.
Now getting warm !
Expected to get humid, cloudy on Thursday, Friday.

RT @yogstwits: Feels like kerala...good rain with thunder and lightning...at Ajman (11pm)
>> W.D effect 

For South India...
On 22-Jan, Thursday, a moderate easterlies is expected to reach Tamilnadu coast.
Moderate scattered rain expected for Tamilnadu coast and #Chennai on Friday, Saturday ... http://ow.ly/i/8jv3C 

#Chennai - to have COLD morning (19/20 C) on Tuesday, Wednesday.
22 C morning and a cloudy day on 22-Jan.
Chance of rain on Friday morning !

The first strong W.D system as upper,mid-level trough is expected to reach W,N-W,N,N-central India in next 24hrs.. http://ow.ly/i/8jrZP 
At present, the W.D LOW is seen over South Iran and its mid,upper-level trough seen South upto 20/19N over Oman.. http://ow.ly/i/8jsic 

After nearing Indian W,N-W borders, the upper,mid-level trough is expected to weaken on 22-Jan.. http://ow.ly/i/8jst1 
On 21-Jan, the low-level trough of W.D is expected to be from Ncentral Pakistan and dipping South to 19N over N-N-E Arabian sea. 
On 22-Jan the low-level circulation of W.D is expected  to push into N-W,N-central India ... http://ow.ly/i/8jt0V 

Evening of 20-Jan...
Cloudy with light rain expected over W,W-ghats,N-W Maharastra, N-W Karnataka.
From afternoon of 20-Jan... It'll be cloudy over N,N-W Gujarat, W,N,central Rajasthan, Punjab, Himachal and Kashmir.
Morning, 21-Jan...
moderate to heavy rain for N-W,W,S Gujarat, W,S Punjab and N Rajasthan.
Snow/rain over Kashmir... http://ow.ly/i/8jtCG 

Due to W.D, on 21st night into 22-Jan..
Heavy, scattered rain for Kashmir, Himachal, Punjab.
and
Over S,E Gujarat, S,S-E Rajasthan, N,W MP.
On 22-Jan, HEAVY scattered downpours expected for W,N,central Madhyapradesh and into Delhi, W Uttarpradesh.. http://ow.ly/i/8ju1S 

*** Alert ***
Starting from Tuesday night, heavy rain or snow expected for Kashmir and Himachal.
Expected to last till Friday night !

On Saturday, the mid-level trough of weakened W.D is expected to persist from N Pakistan to 20N over N-E Arabian sea. 
This mid-level trough can pop another low-level circulation over Gujarat and then push N-E.