This was a cool assignment.  I used Audacity to make my own sounds to imitate the beginning of a thunderstorm.  I made the wind myself, the rain was my fingertips on a Diet Pepsi can, and I also did my own lightning strikes. (Sorry could not figure out how to make thunder.  Everything with my hands sounded too drum roll like.)  Once I made the file in Audacity, I exported the track to be saved as a .wav and uploaded it into Soundcloud.  Fun little assignment for 1 1/2 stars.