# Can someone help me identify this cloud formation?

These pictures were taken today in Oklahoma City and I am both baffled and curious as to what formation this may be. I was wondering if anyone had any idea?

Thank you!

• About what time will help in sourcing radar and satellite data to match. You're talking about the wide arc, yes? – JeopardyTempest Apr 27 '18 at 4:18
• It appears to me to possibly be either a gravity wave or an outflow boundary. As @JeopardyTempest indicated, satellite and radar data would help. If you don't know where to find that information, you could give us a date and approximate time and we may be able to. – DavidH Apr 27 '18 at 12:02

Well, after a bit of research, I stumbled upon the following image:

This is from a blog of two storm chasers Roger and Elke who I believe witnessed the same cloud formation as you. In the following link:

http://stormeyes.org/latest/tag/left-moving-supercell/


They refer to the formation as a 'rear flank arc cloud'.

So in conclusion I believe, the formation is a kind of arcus cloud. You can learn more about arcus clouds on wikipedia by following the link:

https://en.wikipedia.org/wiki/Arcus_cloud


I hope I have been of help.

• Useful searching... but though it may or may not be an arc cloud, it does not appear to be associated with any storm structure such as would entail a rear-flank downdraft. Thanks for the input! – JeopardyTempest May 10 '18 at 23:31
• @JeopardyTempest - to me it looks like a Arcus cloud - en.wikipedia.org/wiki/Arcus_cloud. – gansub May 27 '18 at 16:21
• And these are common in gust fronts and they are sometimes known as shelf clouds. – gansub May 27 '18 at 16:22