Downward motion destroys the strong gradients at the boundary layer top.
Upward motion destroys the evaporation duct.
Lows and fronts have rain and deep cloud formation. Assume that at the present time, local ducting conditions are producing slightly extended radar ranges. The TOP of a stratus cloud deck would most likely be associated with which ONE of the following The base of a duct. The top of an elevated trapping layer. The top of a duct.