Instant Snow: In case it doesn't snow on Saturday, and you're dreaming of A White Christmas, hurry out and get yourself some Instant-Snow. Just add water, and let it snow, let it snow, let it snow!
Each 8 oz jar of the powdered polymer flakes make 2 full gallons of snow. You can also buy test-tubes of the stuff, which make 2 cups: perfect when you need snow at the ready.