Consider a large 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 our planet, and the disc is consistently hovering above the same place on Earth (a landmass, like America or Asia). This disc blocks any sunlight hitting it from reaching the surface. This disc remains here for several weeks.
What effects would this have to our atmosphere and weather?
Various persons have suggested that the current question is similar to A 40km diameter alien saucer is floating 2km above the ocean for a long time. What are the effects on the sea ecosytem below?
However, I am not interested in how a much smaller disc object would effect the sea, as in my setting the much larger disc I am talking about is mostly above land - plus I want to know how this would effect the weather.
The "duplicate" question doesn't mention weather at all - which doesn't this question, which is specifically about weather (not sea ecosystems).
I have a world I am building with sunlight being blocked in a similar manner to how I have described - this disc in question is maintained and built through alien technology so advanced it is indistinguishable to magic. All I need is some input on how to describe the weather for anyone stood underneath this disc - would the weather be calmer underneath this disc? Or would there be storms? Or would the weather be the same as usual?
The core of my question is "how would the weather be affected". If anyone has any suggestions on how to make this clearer that would be greatly appreciated.