tornado's structure, including the funnel cloud, debris cloud, and surrounding winds.

vortex cyclone twister whirlwind maelstrom funnel debris winds rotation updraft downdraft inflow outflow circulation spiral spin swirl gust gale squall turbulence suction pull drag lift pressure vacuum centrifugal centripetal coriolis convergence divergence shear instability condensation evaporation moisture humidity saturation adiabatic thermodynamics convection advection buoyancy density viscosity friction momentum