Musnad Abu Ya'la al-Mawsili 150:209

'Abd al-A'la narrated to us, Bishr ibn Mansur narrated to us, from Ibn Jurayj, from 'Ata', from 'A'ishah, who said: When the Messenger of Allah (peace and blessings of Allah be upon him) saw a cloud formation (that looked like rain), he would become anxious because of it, his color would change, and he would pace back and forth, entering and exiting. Then, when it rained, he would be relieved of that. 'A'ishah said: I asked him about that, and he said: "How do you know? Perhaps it is as he (the Prophet Hud) said: 'Then, when they saw it as a dense cloud coming towards their valleys, they said: "This is a cloud bringing us rain!"'" (Al-Ahqaf: 24).