Position Duplicated Falling Snow?

I’m using the snow tutorial and it works great.
http://www.kirupa.com/developer/mx/snow.html

The problem is that instead of having a small circle for snow, I used a larger snowflake instead. When I test it the snowflakes come in in the top quarter of the movie instead of starting off screen like the snow did.

How can I position the the snowflakes to duplicate off screen so it doesn’t look as if they magically appear on screen?

Thanks!