Unusual clouds

The last unusual clouds you saw here were from Dinosaur Provincial Park in Alberta on September 3 of last year. Two days ago when we headed out to run a few errands, the atypical combination of clouds overhead caught our attention. Rather than go back home for a real camera, lazy me pulled over and used an iPhone.

© 2018 Steven Schwartzman

UPDATE: Unbeknownst to me at the time, the last of the several pictures I took included a jet plane. It appeared to be flying parallel to the prominent cloud, yet the airplane produced no contrails at all. The long white cloud remains a mystery.