I was read in Torah Tavlin the following:
"Chazal tell us that the darkest clouds contain the most rain."
Does anyone know where the source for this Chazal is located?
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דכי אתא רב דימי אמר אמרי במערבא נהור ענני זעירין מוהי חשוך ענני סגיין מוהי
As when Rav Dimi came [to Bavel from Israel], he said: "They say in the West [i.e. the Land of Israel], 'Light clouds, little water. Dark clouds, abundant water.'"