Processes just above the boundary layer are also important, and observations on this day provide some evidence of Kelvin-Helmholtz instability above the boundary layer that may be responsible for modifying the ideal two-layer structure of the lower atmosphere. Observations of two examples north (upstream) of a major bend at Point Conception are shown. The first example is north of Point Buchon where the coastal boundary is fairly linear and unbroken. The wind has little to no cross-shore component. The measurements suggest that there is a superadiabatic layer in the process of overturning that is generating vertical mixing near the top of the inversion layer (400-550 m). The second example is above an expansion fan by Point Buchon where wind shear increases and stability decreases, which would both act to lower the Richardson number below the critical threshold. There is clear a secondary well-mixed layer as detected by the Wyoming Cloud Lidar that is bounded by two narrow layers of higher stability, which marks the marine boundary layer below and the free troposphere above, which is confirmed by the in situ probes. While the limited observations are not completely conclusive, it appears that the structure of the lower atmosphere is consistent with an environment after the overturning of Kelvin-Helmholtz instability.