The popular view that juncture flows are dominated by an array of steady horseshoe vortices is not universally correct. Visualizations are presented that show that vortices do form but that they undergo a periodic generation and shedding motion. The temporal scale of this cycle does not depend strongly on the characteristics of the incoming boundary layer. Also, the vortices exhibit an unusual pinching‐off process in the wake of the cylinder leading to new horseshoe‐vortex filaments existing behind the cylinder, which are then convected downstream.