We’ve had good luck in Colorado resorts with Joel Gratz at http://opensnow.com/ He posts detailed ski forecasts in addition to accumulation reports. There are 4 other reporters on the site for other US ski areas.
If all you’re concerned about is snow. You can take a look at:
But you really should pick the locations to ski and then look at specific mountains or areas to see what the snow report actually says.
EDIT
OK. Here is the resource specifically for the SKI resorts in the US and not only there.
Credit:stackoverflow.com‘