Do All Storms with Rotation Make Tornadoes?

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In another part of our series about Tornado Myths, we investigate whether or not all rotating storms produce tornadoes.

According to The National Severe Storms Laboratory, only about 20% of all “supercells” produce tornadoes. A supercell is a storm with a deep, rotating updraft. That means almost 80% of the most powerful storms that show rotation on radar do not actually produce tornadoes. An even smaller percentage of them produce violent EF-4 and EF-5 tornadoes. Those violent tornadoes make only 2% of all tornadoes.

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