[Spycrab]

On a flat earth, since the sun spins over it, allegedly, one part is heated at a time.
Since the moon is supposedly cooling, the other half gets colder, correct?
On a globe, weather and wind are complex because the earth's movements are on an axis, and orbiting while also rotating.
There's tilting, turning, twisting, etc. Enough variation to change  pretty frequently where it is hot and cold.
Since hot air rises and expands, and cold air sinks and rushes in to replace it, we get wind and weather.
Since the hot and cold are so varied, where the wind blows is varied. We get all sorts of weird weather.
On a flat plane with only an orbiting sun and moon above it, hot and cold would be relatively simple, daylight side is hot, moonlit side is cold.
Wind would travel to the hot side.
However, the wind isn't this predictable.
Care to explain?

[AATW]

The bigger problem is that were the earth flat, what is keeping the atmosphere on top of it? Why doesn't it just leak off into space?
The solutions to that are a physical dome (some flat earth models claim that) or an infinite plane (ridiculous, but some models claim that too).
The actual explanation given is some nonsense about temperature gradients or something but the in real life the high pressure over the earth would quickly leak out towards the low pressure and over the edges into space.