Photo above...strange down cloud. At first I was concerned that it might be a funnel cloud, a harbinger of a tornado, but it didn't have the movement nor the smooth tubular appearance of a funnel cloud.
Photo below...It was a pre-sunset sky and the golds, pinks and lavenders were just making their appearance.
Photo below...another shot of the strange cloud. Camera set at full zoom (all 3X of it LOL).
Photo below...I wondered if perhaps it was a trail caused by a weather station rocket, though they are usually not so big nor so vertical.
Any ideas as to what you think may have caused this strange cloud ?