Snow apocalypse? Please! We have had over 44" so far this year! I know you southern folk aren't used to it, but come on! Lol

Those heat packs are ok for small, confined places like a cardboard box for a few hours, but otherwise useless. Bags of warm water, provided you can heat it will be much more effective. Ziploc bags would work. But those warmer a are good if you are in a jam.