'A'isha said, "When the Prophet, may Allah bless him and grant
him peace, saw a cloud in the sky, he would get up and down and walk to
and fro, and his face would change colour. When it rained, that would leave
him." When A'isha commented on that, the Prophet, may Allah bless him and
grant him peace, said, "I do not know. Perhaps it will be as Allah Almighty
says:
'When they saw it as a storm cloud advancing on their valleys...'
(46:24)"