Donald unless you're on a multi day alpine ice route, the weather doesn't that fast to turn an otherwise good route into a river
True, but then like I said before, lets suppose we are talking about that.
"There was one problem, however. The brilliantly sunny weather melted much of the ice that held the upper rocks in place, with the result that rockfall was heaver that usual." Eiger: Wall of Death by Arthur Roth Page 132.
The Mohonk Mountain House and the Mohonk Preserve have done a great job protecting the environment thus far, but ... it's all down hill from here http://youtu.be/9AU8fMo8v4k.