The picture from the Iss.

[curiousone]

One of the Astronauts said theres a cloud covering the Earth. What did he mean by that? Was the Earth hard to see and why? Curious One

[Ophiolite]

It would have been helpful if you had said which astronaut said it, when they said it and under what circumstances. In the absence of that detail the most likely explanation is a very simple one. When he said there was a cloud covering the Earth it was because there was at that point in time clouds covering a substantial portion of that part of the world visible from the ISS. Clouds can cover many thousands of square miles. Certainly more area than the area visible from the ISS. So really nothing surprising, or unusual.