A proper cloud. Everybody understood what he meant, including you. Why the need for such extreme pedantry? Oh right. It's HN, home of uber-pedants.
So, yet again I have to ask because all of the useless answers received to this point have not been an actual answer to what a proper cloud is that could interfere with a signal
If sounds like you don't agree with him, but don't pretend you don't understand him. Please.
Normal ground to satellite communication use wavelengths of 7 mm and up, as those have reasonable cloud penetration.