Utterly Mad

Alright, lemme try this:

The Static

This weather phenomena makes the area really foggy, snowy, and cold, so cold that it's basically death, while also jamming radio signal. What makes this odd is that sheltered people start developing something similar to cabin fever, it's nicknamed by people who survived this the "Wendigo Mentality". The symptoms is that the person starts thinking that a monster is after them, not others, just them. They start to panic, then they start to cannibalize their mates unless a "Sane" person kills the person with the mentality. This mostly happens in Canada and the colder regions of america, but in some cases it has happened during winters in the Mississippi desert.

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I thought it was a pretty snazzy idea. If it doesn't work or something lemme know. Also the wendigo mentality is a real thing actually. It's actually called "Wendigo Psychosis"

http://www.cracked.com/article/80_5-mental-disorders-that-only-occur-in-one-place-earth/

It's number five if you wanna read up on it.