A rotating updraft or supercell is a condition that's not required for all thunderstorms to form.
For thunderstorms to form, unstable air, moisture in the atmosphere, lifting force, and moisture in the lower-to mid-levels of the atmosphere are all required.
It should be noted that the rotating updraft or supercell isn't required. This is because the supercell is a thunderstorm on its own. It is characterized by the presence of a mesocyclone.
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