Hate to say it, but facebook is where I get all my maps. Just follow the right people (Famous Internet skiers, Rebecca's Northeast Weather and Education page, il snow.com, ski resort pages, friends that post maps) and you get more maps than you could ever want.
If you use the "I don't want to see this" feature to weed out political bullshit and kid pictures from random friends, facebook is a pretty useful tool.
There is an APP called AllSnow and they are not afraid to post predictions a few days out. Of course a few days prior isn't accurate all of the time, it helps build the hype.. I dig it
The app also has trail maps and you can track your runs. It will list the trails you hit, max speed, miles, vertical, etc