Edge Animate CC :: Setting JavaScript To Make Falling Snow?

I have managed to make a flake in Edge to flash randomly after following a tutorial on lynda.com
 
My javascript knowledge is fairly limited but I used the following code on a trigger inside the flake symbol I made:
 
var randomFrame = Math.floor(Math.random()*5000);
var maxWidth = $('#Stage').width();
var randomX = Math.floor(Math.random()*maxWidth);
var randomY = Math.floor(Math.random()*300);
 sym.play(randomFrame);
var myName = sym.getSymbolElement();
  $(myName).css({'position':'absolute','top':randomY+'px','left':randomX +'px'});
 
This all works as a randomly appearing flake which doesn't look like snowfall. How to make the symbol float down from the top of the stage and repeated lots of times to look like snowfall?