The Joetsu Kokusai Ski Resort live camera (Niigata) is published on the resort's official site. Open it from here, and check current snow depth, the 7-day snowfall forecast and nearby resort cams.
Cameras: Joetsu Kokusai Live Camera (official site).
Snow depth and the 7-day snowfall forecast are weather-model values for the resort's location.
Live cameras at nearby resorts: