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To start off, the thunderstorm needs to have a rotating low pressure area called a mesocyclone, covering an area 2 to 6 miles wide. This usually occurs in the rear portion of a supercell, but can also develop within a squall line, often on the north side of a bow echo. A downdraft can occur near the mesocyclone and wrap around the bottom portion, causing it to tighten and intensify and stretch toward the ground, producing a tornado.

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