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Tornadoes occur during severe thunderstorms are very usually precedes by very heavy rain which, depending on the storm, may or may not stop before the tornado hits. This rain may be accompanied by hail, which can reach very large sizes. Many people have noted green or other unusual colors in the sky before a tornado. While this usually indicates a severe thunderstorm, it does not mean a tornado is coming, nor does its absence mean there won't be one. The tornado itself usually occurs in the rear half of the thunderstorm, if that portion of the storm is rain-free you may note a lowering of the cloud base and rotation in the clouds; this is the wall cloud from which the tornado may form. Near this wall cloud a hole may open up in the clouds, showing the location of the rear-flank downdraft that plays a crucial role in tornado formation.

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