There was a great Dio on this site recently, and it had a very good example of a tank in a very muddy/snowy terrain. I think it was a Tiger, but I can't remember. I'm trying to find the page on the site, but I can't seem to locate it. If anyone could help find it, or they have another article that demonstrates good techniques for mud and snow(Eastern Front) on a Tank that would be great.

Thanks

You could try celluclay tinted for the mud and wudland scenic water the sprinkle on some micro baloons for the snow - theres also a product called snow foam at LHS's iv'e seen used to good effect.