Final answer:
Tornadoes form within supercell thunderstorms due to differences in wind speeds that cause a rotation of air.
Step-by-step explanation:
Tornadoes form within supercell thunderstorms. Supercells have a rotating column of air that extends vertically, usually covering about four miles. The rotation of this column of air shifts due to differences in wind speeds between the strong cold winds in the jet stream and weaker winds from the Gulf of Mexico, causing a tornado to form.