Have discovered I've written a review already, but have missed off that Feratel, the streaming camera company, have cameras all over the area. The Westendorf cameras view two of the main skiing starting points and give a very good indication of snow conditions. There's a camera on Choralpe and on Talkaser.
Be wary that the snow across the valley can look very poor, even though Westendorf has snow. Westendorf keeps its snow far longer, as the far valley side is sun-facing.
Also, if you fly to Innsbruck, have a look for direct trains from Innsbruck. 15 min bus transfer from the airport to the main station and straight to Westendorf in about an hour. If there's 5 of you, or so, consider a taxi. Upside? 45mins quicker, elapsed.