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Visible signs of a possible tornado often start as rotation in the clouds of a severe thunderstorm, often with a lowered section of the cloud base called a wall cloud. As this happens a cloud of dust may appear near the ground as something called a rear-flank downdraft wraps around the rotation.

Then a cone, funnel or elephant trunk shaped projection may lower itself from the cloud base. A cloud of dust and debris under this funnel cloud usually means that the tornado has touched down.

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