As someone already said, if it's already snowing at an area that's 5 hours or more away, you're already too late.
You can go by near-term forecasts and hope they're right, since you're committing time and money to beat the storm. There's been considerable discussion of that option already.
The best option, of course, is to move to a place close enough to the skiing so you can respond to what's actually on the ground when you check the website after rolling out of bed at 6am.
Less than 8 inches? Sleep in or go to work.
More than 8 inches? E-mail the office: "I'll be in after lunch."
Works for me.
Expert Skier: Gets all excited cuz it snowed 12 inches, gets up early so he can beat the crowds.
Real Skier: Sleeps in til noon since it only snowed a foot overnight.
(Courtesy of http://avondell.com/skiing/skihumor.html)
What can I say?
I'm not a Real Skier (TM) and my standards are low.
We're glad that you routinely sleep in for anything less than 18"...