وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَقُولُ ‏"‏ إِذَا أَنْشَأَتْ بَحْرِيَّةً ثُمَّ تَشَاءَمَتْ فَتِلْكَ عَيْنٌ غُدَيْقَةٌ ‏"‏ ‏.‏

Yahya related to me from Malik that he had heard that theMessenger of Allah, may Allah bless him and grant him peace, used tosay, "When a cloud appears from the direction of the sea and then goestowards ash-Sham, it will be an abundant source of rain." Translation Not Available

Book reference: Muwatta Imam Malik Book 13 Hadith 456
Web reference: Muwatta Imam Malik Book 13 Hadith 5