NOAA’s National Operational Hydrological Remote Sensing Center has an Interactive Snow Information Map for the US. It is a great mapping tool for analyzing snow cover. The map is highly configurable. You can re-center the map anywhere in the US. One can map Hourly Snow Analysis, Driving Conditions, and Daily Snow Analysis. You can look at historical data. One can select overlays to be plotted such as Hydrologic, Political, Point or Transportation features for reference purposes.