Calorie-Count About.com Health
Calories Burned for Activity: Skiing
Cross Country, 5.0-7.9 Mph, Brisk Speed, Vigorous Effort

612 calories per hour

Assuming a body weight of: 150 lbs
This is equivalent to eating any of the lines of the following table.

Quantity Description Cals
2.4 Grande Starbucks Caffe Latte - Made with whole milk 260
0.9 McDonald's Big Mac - With cheese 704
7.7 Glasses of wine (3.5 fl oz) 79
2.2 Snickers Bar 273
3 Cans of Coca-Cola 207
20.4 Carrots 30