ive seen many times where is a snow threat 10 days out...then its gone for a few days and then one random 00z run---it comes back. Not everytime but i would give it 24-48 hours before tossing the idea
its not normal to have these drastic changes 6-7 days out. This also happened last week when we trended from 70 degrees to 33 and Rain for Dec 26th in just a few days