It is narrated from Sayyida Aisha (may Allah be pleased with her), she said: Whenever the Messenger of Allah (peace and blessings be upon him) saw a cloud spread at the edge of the sky, he would leave his work, even if he was in prayer. Then he would turn his attention towards it. If Allah removed it, he would praise Allah, and if it rained, he would say: "O Allah! Make it a heavy and beneficial rain."
Hadith Referenceالادب المفرد / كتاب / 686
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه أبوداؤد ، كتاب الأدب ، باب ما يقول إذا هاجت الريح : 5099 و ابن ماجه : 3889 و الدعاء رواه البخاري فى صحيحه : 1032 - الصحيحة: 2757»