Overview: The Sierra Nevada Mountains in California are pounded every winter by strong Pacific storms. Once the skies clear, this deep snow is the perfect place for winter-time exploration and fun. Greg shows you how a ski resort, like Yosemite's Badger Pass, can be a great way to access the backcountry. Greg Aiello uses a revolutionary new snowboard that transforms into cross-country skis and checks out how the next generation of snow shoes is opening up this sport to a whole new crowd. And, you won't believe where today's snowmobiles can go. Modern advances in these amazing machines are pushing this sport into a world you have to see to believe.