It's a fair question. I have to say I have never heard of any issues from snow accumulation while sitting. Anecdotally, this has not been a topic of discussion as far as I could find but you might search other forums, particular to your car.
One way to check to see if running your scoop facing forward in a snow storm is, just after driving, pull into a safe place and see if you have any moisture accumulation on your air filter. Then turn the scoop around and see if it improves.
I'll bet you don't need to do it but I'm not a big fan of snorkels or cold air intake for that matter. Too much OEM blood in my system.
Post back up to share what you find.