yes, that's just sometimes. I believe it has to do with the weather pushing hot air up so the clouds come down or something.
I'm not sure how would it work during a storm, when I climbed down it was just a cloudy day and going through them felt humid as if walking through fog :)
Is that just sometimes because otherwise how does it rain and water get to the trees? And can thunderstorms and lightening form while your in the cloud layer?
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