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There are a few possible explanations.

Tornadoes are often made visible by the condensation of moisture inside the vortex. If a parcel of dry air enters the tornado, or if the tornado weakens, the visible funnel may evaporate. In this case the tornado is still present and still dangerous, but it has essentially become invisible.

A variation of this phenomenon can happen in multiple vortex tornadoes. Tornadoes like this contain multiple smaller, short-lived vortices within a larger tornado. If the amount of moisture in the air is just right, the smaller vortices will be visible as they form and dissipate, but not the larger vortex will remain invisible.

In other cases the processes that cause a tornado to dissipate may start, but not finish, causing a tornado to temporarily lift.

In other cases a thunderstorm may go through cycles of strengthening and weakening. In the process it can produce multiple tornadoes one after another.

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7y ago
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Q: Tornado disappears then comes back
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