The Survivalist's journal entries in Honest Hearts describe how after the bombs there was black radioactive rain, followed by a two month period of such high radioactivity he couldn't go outside, followed by glowing green snow. And all this in a national park away from anywhere particularly hard hit (he counted 7 nukes on/around SLC). Also noted that the Army said fallout should fade out within 2-4 weeks, so months on end of lethal radiation was something unexpected.

Later entries discuss cannibals wearing Vault jumpsuits.