Here are some resources that we use while planning our trips to research the locations, routes, and weather. Also, avalanche bulletins are very important for understanding the current situation on the slopes.
Resort info and weather
DAV Weather Report, https://www.alpenverein.de/DAV-Services/Bergwetter/
Weather report at WePowder, https://wepowder.com/en/forecast
Weather to Ski, https://www.weathertoski.co.uk/
Snow forecast for ski resorts, https://www.snow-forecast.com/maps/dynamic/alps