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There is no way of knowing for certain to tell for certain. If you are looking at the storm itself (which is usually not a good idea) you may see the clouds rotating with a lowering of the cloud base near which there is an opening in the clouds. These are common precursors tor a tornado. Once this happens a tornado can form within minutes. If you see an elongated cloud hanging from cloud base it is likely a funnel cloud, which means that a tornado may very likely touch down or may already be on the ground. If you see such a cloud take cover immediately. These features, though, may be obscured by rain or the dark of night.

If you are not watching the storm itself pay attention to weather broadcasts. If a tornado warning is issued it means a tornado has either been detected or may form at any time. In these circumstances power often goes out so it is good to keep a battery powered weather radio.

If you are looking at a radar image a storm that shows a hook shape, especially on the southern or western side, often has a strong chance f producing a tornado.

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Q: How do you know when there's going to be a tornado?
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