as the tops of layer clouds have high albedo, they absorb little sunshine to warm them, and so cool by losing long-wave radiation to outer space resulting in the smooth top of a layer cloud, an example of an inversion layer. Inversion layers represent extreme stability and cause:
limitation of any ruffling of the surface layer by vertical air movement to an extent dependent on the depth of the inversion & its intensity (the difference between the top and bottom temperatures), although can be penetrated by a plume of hot gases from a bushfire or by a vigorous convection cloud.
less aircraft lift above it as the air is warmer, thus planes experience a jolt when flying through it
more aircraft lift flying below it, thus may cause pilots to have difficulty landing
sound is reflected beneath an inversion since waves travel faster through the upper warmer air & so are bent back towards ground, thus to a ground observer, aircraft noise is much greater when they descend below the inversion layer
air pollutants and clouds tend to be trapped below the inversion layer
there is decoupling of the winds with those below it being still whilst those above it are now no longer slowed from ground friction and become faster