IA anon here. Good advice for those who've never seen temps this low in their lifetimes. For us and those north of us, this is a cold snap. They seem to come in 20-30 yr cycles. I was born in one, there was one when i was in high school and there was one during the Clinton years. Prepping for these is second nature to us.
Unless you have military survival training, stay indoors. If you do have military training and cold weather clothing, whataya fuckin' nuts?