An image of Altocumulus Floccus Clouds above Boulder.
The featured image is the unedited original image. And below is a slightly edited version of the image where I increased the sharpness and modified the shadows and highlights a bit which is looking better with the blue backdrop of the sky.
Image was taken at 6:51pm on September 15th 2023.
Shutter speed: 1/1133
Focal Length: 6.81mm
The SkewT diagram for 15th Sep 2023 at 6pm (MT) , Grand Junction is present below (Credit: Soundings from University of Wyoming)
Looking at the temperature line and the dewpoint, the region of altitude from approx. 3km to 7km has a likeliness of cloud formation. This info coupled with the shape of the clouds as seen in the image would mostly imply that these are Altocumulus Floccus clouds.
The report can be accessed here: