1. Satellite images from IMD : IR and other images are available from IMD including animations. The images are updated every 30mins.
5. Worldwide Lightning location network :- Indicates lightning ie severe weather locations
6. STH stormwatch ie this blog.
Update 1 (15May2016- evening)
The above system has concentrated into a well marked LOPAR. It is likely to move northwestwards, become a deep depression and cross the Tamil Nadu coast between around 17May2016 (morning) - source