Remember this video?
Well, the raw video has been released (extended version, watermark free, un-narrated, 1080p version).
This rare weather phenomenon would be due to a combination of cold, dense air and an eddy in the river.
"This Boxer puppy was born with severely deformed rear legs and pelvis. The bones in his legs were completely fused by the time he was 8 weeks and there was no way to correct or save them so his owners decided to amputate his rear legs to give him a better chance at life.
He does physical therapy (including hydrotherapy) everyday and has a custom wheelchair to give him a second option of mobility."