Clouds near the bottom of the frame are cumulus, higher clouds could be nimbostratus and some stratocumulus. Small Kelvin-Helmholtz instability near the top. Picture was taken just before light rain — unstable atmosphere?

Clouds near the bottom of the frame are cumulus, higher clouds could be nimbostratus and some stratocumulus. Small Kelvin-Helmholtz instability near the top. Picture was taken just before light rain — unstable atmosphere?