I use what the F1 teams use, its radar, live radar does not predict rain, it actually shows where rain is falling and how long it will take before it arrives and leaves and it shows how strong the rain will be, there are plenty of apps for the phone or you can google them, although there are better here is one and the green areas are where rain is now falling, 
http://www.accuweather.com/en/im/isle-of...r/2992_poi

http://www.netweather.tv/index.cgi?action=radar;sess=