re: Walking Dead solution?

It's rained twice in the few years this has been happening.

Once was conveniently in season 1 right as Rick and Glen were wearing the guts camo and it washed it off. The 2nd was when a random tornado was produced.

I feel like the South has more rain and severe weather than that. But now since they are in north virginia, that place is known to get a couple feet of snow at times.