Snow forecast is great for exactly that. However, the visitor review section is, quite frankly, a complete joke. The 'reviews' are often neither accurate or useful. They simply provide an outlet for prejudice and intolerance. I assume the contributors are also hoping to alienate potential skiers from the resort so that they can have a little more space on the slopes to themselves. Whoever edits the content should be highly embarrassed that they are so out of touch with what is going on.
PS I believe Verbier is a great resort, with the potential to be even better. It just needs Televerbier to stick to their core business rather than think they can also run mountain restaurants!

[note from the editor: we need to rely on the honesty of reviewers as we are unable to stay abreast of all conditions/changes at all our listed resorts! Your review is one such critique which could help edit relevant reviews so only sincere words are displayed.]