Unusual cloud formations
Taken by Tom Naber on September 8, 2018 @ Davis, IL
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  Camera Used: Canon Canon EOS REBEL T4i
Exposure Time: 15/1
Aperture: f/5.6
ISO: 1600
Date Taken: 2018:09:08 23:38:53
  
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Details:
I observed strange finger-like clouds looking east at the northwestern edge of the remnants of tropical storm Gordon. The Pleiades are also seen in the photos.
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Comments
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They may be-- https://en.wikipedia.org/wiki/Kelvin%E2%80%93Helmholtz_instability
but kinf of spooky just in time for halloween!
Posted by HP1954 2018-09-09 11:25:51
I suspected Kelvin-Helmholtz instability, although when I have seen it before, the clouds looked more like a series of open loops instead of fingers. The light pollution from a city 20 miles southeast of me (Rockford) that I usually curse as an astronomer was useful for a change in illuminating these clouds so I could see them and photograph them!
Posted by tenaber 2018-09-09 14:12:35
Actually, if you look at the cloud on the far right it has the wave whirl.
I found another photo at this link:
https://www.metoffice.gov.uk/binaries/content/gallery/mohippo/images/migrated-image/d/wavecloudsduval.jpg :)
Posted by HP1954 2018-09-10 11:36:05
 
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