What the guy above said!
25ft can slide. Treed slopes too (if you can ski it, the trees won't *always* hold it). There are many variables.
Read Snow Sense!
Look here for online avalanche information:
Good Collection of Avalanche Information
Scroll down for links to an online intro.
Take an Avalanche I course!
It is what I would do if it were me. It's not me and neither are you.
Mountain Rescue - High Altitude Dive Rescue