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.