My memory is very fuzzy, but a few years ago I read a short story or series of stories (maybe even on reddit?) about an apocalypse scenario.
But the form of the apocalypse was different... as I recall it was sort of an "entropy storm"... slowly rolling across the country from coast to coast. It would disable all advanced electronics first (radios, planes), then mechanical (cars, guns), and eventually the most primitive things, like fire, would stop working.
It was slow moving, too. Such that people had enough time to flee ahead of it... being sort of driven on a massive "migration" by the storm.
I don't remember much other than that. Does anyone else know what I'm talking about?
Google is mostly returning results on The Last Question by Asimov (probably because I keep using entropy as a keyword), but that's definitely not it.
It is also not "Time Storm" as suggested in the comments.