The discovery of the app SkyMotion which tells you exactly when it's going to rain almost to the minute and in the place where your phone is.
Along with a realtime weather every 5 minues , you can also get details of the next two hours.
Not on your mobile phone use the NowCast
Skymotion is available for a lot of devices iOS, Android, Windows Phone. Check the Skymotion Weather App product page for downloads.