What would the weather be like after the world is shaded by an immense object?

I have a situation in my imaginary setting, and I am specifically interested in how this situation would affect the weather.

The situation is as follows:

Positioned above a large landmass of my world is an immense flat disc, at least two thousand miles in diameter. It is thin and has comparatively little weight or mass, but it is also opaque and does not let any light through.

This flat disc is positioned roughly 40-50 miles away from the surface of the world, hovering in place over the same landmass the entire time. This disc blocks any sunlight hitting it from reaching the surface.

In such a situation, what affects would this disc have to the weather of my world?

The disc in question is maintained and built through alien technology so advanced it is indistinguishable to magic. What I want is some input on how to describe the weather from the point of view of anyone stood underneath the disc - would the weather be calmer underneath this disc? Or would there be storms? Or would the weather be the same as usual? The disc is obviously not science based, but the I would like science based descriptions of how this disc would affect the weather. For all intents and purposes, imagine this world was identical to Earth, and the disc was hovering above America.

posted about 5 years ago

Jimmery‭

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