You have to take a knife and go to the window, where you will cut throught the air and say : How i cut throught the air, may that the clouds will cut and go away! The rain will stop as i say, the storm will obey!
Cut throught the air and say this 3 times, then put the knife on the window with the knife edge up. You will have to leave it on the window until the rain will stop, this should stop the rain/storm in maximum 25 minutes, depends how hard you concentrate, if you will do it right, it's gonna stop in a few seconds!