If you don't trust ski resort management, you can check a nearby SNOTEL site (run by the Dept of Agriculture -- to track water reserves, I think).
As usual, wikipedia has a good explanation http://en.wikipedia.org/wiki/SNOTEL
The whole thing seems to be down. Hopefully it is just maintenance, not budget cuts.
This link from my browser bookmarks is close to Jackson Hole, if I remember correctly. Maybe it will work tomorrow.
I also like http://www.snow-forecast.com/ a lot for regional overviews. They take the digital forecast model data from NOAA and post-process it in combination with fine-scale topographic info. This was a lot more important several years ago, before NOAA started to do point forecasts (which to take topography into account). In fact, my snow-forecast info may be obsolete...I think I will go see if they have current explanations.
The address without the hyphen http://www.snowforecast.com/ is a different site, which also has some good features. It is more "list of resorts" oriented.