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There are two factors: lighting and soil.

How the light hits a tornado is important. If a tornado is lit from behind, (relative to the viewer) it will appear dark, if it is lit from the front it will often appear light. The same tornado may appear light or dark depending on where it is relative to your position. The link below shows two pictures taken of the same tornado at about the same time, but from opposite sides.

The soil can also affect the color of a tornado. Some tornadoes lift up large amounts of sand, dust, and dirt. When this happens dark soil will give a tornado a dark appearance and light soil will give it a light appearance.

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13y ago

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