'Cloud' in the Bible

Then I saw another powerful angel descending from heaven, wrapped in a cloud, with a rainbow above his head; his face was like the sun and his legs were like pillars of fire.

Then they heard a loud voice from heaven saying to them: "Come up here!" So the two prophets went up to heaven in a cloud while their enemies stared at them.

Then I looked, and a white cloud appeared, and seated on the cloud was one like a son of man! He had a golden crown on his head and a sharp sickle in his hand.

Then another angel came out of the temple, shouting in a loud voice to the one seated on the cloud, "Use your sickle and start to reap, because the time to reap has come, since the earth's harvest is ripe!"

So the one seated on the cloud swung his sickle over the earth, and the earth was reaped.