When two planets are very close, what is the environment like?

So, I read the question, the associated answers and comments located here, as well as some others that were more divergent than what I was hoping for.

Basically, imagine two earth-like planets very close to each other and tidally locked. Say that there is something like 100 miles between them and some sort of magical\advanced technology structure is keeping the planets in this configuration:

What does this do to things like gravity, wind speeds, etc.? I would see gravity being close to being cancelled out on the surface, possibly with the effect of small, floating islands of material being possible.

How far would the effects be noticeable felt by those on the planets? What would weather patterns do in the area?

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When two planets are very close, what is the environment like?

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