How do tornadoes grow bigger?

Tornadoes grow larger primarily through the interaction of warm, moist air at the surface and cooler, drier air aloft, creating instability in the atmosphere. This unstable air can lead to the development of supercell thunderstorms, which can produce rotating updrafts known as mesocyclones. As these updrafts strengthen, they can draw in more air and moisture, feeding the tornado and allowing it to grow in size and intensity. Factors such as wind shear and the presence of a defined rotation also contribute to the tornado's development and growth.