I actually knew people who died from carbon monoxide poisoning while using a faulty propane heater out camping so make DARN sure it's rated for indoor use. You might want to fire it up now to test it out.
I'm looking out my window now at about 3 feet of snow on the ground and have to admit I was a bit amused when Atlanta shut down with 2 inches of snow on the ground (around here we call that 'October'), but an ice storm is MUCH worse. You WILL see trees going down and power lines snapping with the weight of the ice and if the people were having trouble driving in snow, wait to see what it's like when they're on glare ice. Hand warmers can get too hot for snakes, the 48 hour heat packs that you can get from places like ship your reptiles are much better suited to this task, your snakes can withstand much lower temperatures then you might think as long as they don't have a full belly.
Also lay in a supply of extra batteries.