Clouds roll these beautiful clouds caused by the mass of cold air flows down ground rises. This out air distribution out of the front of the storm that is coming to invade, or maybe it's spread out. After the storm are decomposed.
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Roll clouds beautiful clouds are caused by cold air mass flow hurtling to the ground. The air stream is spread out from the front of the storm came on offense. Or maybe spread out from the side. After the dissolution of the storm.