WTF winter driving

[Bouchedag84]

Hey guys,
We had a huge snowfall here, in Calgary Alberta Canada, a week ago and I had the X5 out. (Keep in mind I've only had it since the end of August)
I assumed with the awd that the x5 would be a great winter vehicle. Anyways, driving to work. I would stop in traffic and be parked there for a few seconds. And then my X's nose would start to slide towards other cars. I would end up being on a skewed angle in the middle of my lane looking like a dickhead who couldn't drive in snow. I have lots of winter driving experience and have never had a winter accident. Anyways, is it my tires that are crap and causing this or what the heck. the tires are all in great shape and are all seasons. Just curious if the X isnt' as good in winter driving as i had hoped...?!