South Boulder: November 9th, 2021, at 3:20pm.
Cloud type is most likely altostratus. The CAPE value is 0 so the atmosphere is stable.
Skew T Diagram: 72469 DNR Denver Observations at 12Z 09 Nov 2021 – 00Z 10 Nov 2021 (uwyo.edu)
Diagram correlates to November 9th at 6pm in Denver