- A roll cloud moving forward from a squall line
- W922601S
- A warm and humid morning dawns with the arrival of a long squall line, darkening the horizon to the west. From out of the blackness, a gray shape emerges quickly. This is a long roll cloud, moving mostly perpendicular to its axis (unlike most cloud lines or streets), situated along the forward edge of a smooth outflow boundary advancing along the ground.
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