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The contrail does not have to disipate at all, only the light shining on it has to be obscured. If the sun shone through hole in the clouds it could create these effects and then they could disappear just as suddenly.
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The contrail does not have to disipate at all, only the light shining on it has to be obscured. If the sun shone through hole in the clouds it could create these effects and then they could disappear just as suddenly.