Indian Weather Man (IWM)

Today, a low-level circulation seen over E Uttarpradesh and its trough seen upto N-E Karnataka and to N-E Tamilnadu http://ow.ly/i/avqi7 
At low-levels, a circulation is seen over S-tip Tamilnadu, Gulf Mannar and another over Lakshadweep ... http://ow.ly/i/avqi7

Today at upper-levels the westerlies is dropping a N-S trough from E Uttarpradesh to N,N-E Karnataka ... http://ow.ly/i/avqnv 
In next 24hrs, this upper-level trough is expected to drift East and drop upto N Tamilnadu ... http://ow.ly/i/avqpu 
By Sunday evening, this upper-level trough is expected to drift East into E India and it's southern end into W,N-W Bay !

Due to this troughs, circulations.
Before midnight...
HEAVY T showers for many zones of S-E India coast, S,S-E Karnataka and S Andhra.
Today evening and before morning of 25-Apr...
HEAVY T showers for N,N-W,N-E,central, coastal Tamilnadu and #Chennai http://ow.ly/i/avqy4 

T showers for W-ghats of Karnataka and Kerala to continue on today, tomorrow.

Nor'wester WARNING ::
Today, HEAVY and damaging T showers expected for Bihar, Bengal, one or 2 in Jharkhand and scattered in Odisha.
And more Nor'westers ahead for Bihar, Jharkhand, Odisha and Bengal on Saturday, 25-Apr as well !.. http://ow.ly/i/avqGm