Though it’s not quite as dramatic as the clouds in my three previous posts in this series, I consider myself quite fortunate to have seen this formation. It was in (I’m not making this up) the Paul Bunyan State Forest in northern Minnesota in late September. Something had caused some turbulence in the steadily-moving low cloud cover and, for a short while, it was perpetuated in the form of something like upside-down waves. The phenomenon lasted only a minute or two, but I was able to make this shot after scrambling for the best foreground I could find, missing its peak by maybe half a minute. Just a very few minutes later the waves had disappeared and the clouds returned to smooth, uniform gray.
Note: Since publishing this post, I have come to think that this may have been an (albeit rather tame) example of asperatus clouds. Please see the comment below by Tintenfisch, which provides a very interesting link and direcction to some additional information.
krikitarts 
Nice.
Thanks, Frank.
I love the cloud formation. So glad you were able to capture it.
So am I, but I wish it would have lasted a little longer. All the more reason to try to be prepared for the unexpected at all times!
I think it s pretty dramatic, the trees seem to fight with their beautiful colors against the dark clouds :D What a great shot!
Thanks, Wolke–if it’s a fight, I think they’re both winning!
For sure :D
By the way, check your Facebook ;)
Wow, that is really different. I don’t think I’ve ever seen clouds quite like that before. Nice capture!
Nor had I. Please see the link sent in the adjacent comment by Tintenfisch–I think she’s right and this is a rather tame example of the newly recognized asperatus clouds.
Wow, I checked out that link. It’s kind of like a raging ocean with undulating waves in the sky. This might just be my new favourite type of clouds!!
Cool! These remind me a little of the dramatic ‘asperatus’ clouds that have made the media a few times in the last few years — some pretty cool examples here, http://www.dailymail.co.uk/sciencetech/article-1189877/The-cloud-Meteorologists-campaign-classify-unique-Asperatus-clouds-seen-world.html , or just under Google images. :)
Hi Kat, I’ve just had a look at the DailyMail link you provided and Googled “asperatus” as well, and I think there’s a very good chance that we may well have another asperatus example here. Thanks for that!
superb sky and colors in the trees!
It’s really too bad it was such a fleeting moment and I didn’t have more time to set up for it a little sooner. I believe it’s a (modest) example of an asperatus phenomenon (see the link that Tintenfisch sent me in an adjacent comment). Thank you!
Wonderful textures there!
Yes, the textures in those woods are very special to me, but the softbox sky helped a lot with the natural enhanced saturation. Thanks for taking the time to comment, and nice to meet you!