These are links to wide area forecast maps of PA and surrounding areas:  

• NWS Pittsburgh office area (SW PA) winter forecast, with probabilistic snowfall
• NWS snow depth map
• Weather Underground 48h snow forecast map

Maps of past snowfalls:

• NOAA interactive map showing snowfall and ski areas
• National snowfall analysis map

Current radar:  

• Intellicast radar
• NWS radar mosaic

Links to the local NWS forecasts for the ski areas are provided on the ski area map (in the pop-up box) and in the 'more info' pages linked to the ski area list.