I captured this image on October 11, 2021 at approximately 6:00 PM MDT. The way the light caused the lower altitude clouds to appear darker stood out to me as I was driving near my home in South Denver during golden hour. Note the excellent variety of clouds in the image. The darker clouds appear to be stratus, and the higher altitude clouds appear to be a mix of altostratus and altocumulus.

From the Skew-T plot we can see that the cloud layers appear to be forming at around 5km and 9.5km. The wind speed was fairly high at these altitudes with the higher group of clouds experiencing the greater wind speed. The CAPE value of 0.00 suggests a stable atmosphere when these clouds we’re captured and this can also be inferred from the cloud type since stratus.