#TrumpTariffs

* Why they are visible: The "ring" becomes visible because the ash particles within the vortex are concentrated and often move in a more organized, helical path, making the boundary of the vortex distinct from the surrounding less organized ash.

* Density and Temperature Gradients:

* "Expanding then contracting into a column": This could be a visual effect of the vortex forming. As the ash enters the core of a forming vortex, it might appear to "contract" into a denser, more defined "column" or ring-like shape, before the vortex itself expands outwards.