Pete Meyers said it was a legit change and there was no bug with Mozcast:
Hmmm... something happen on Google yesterday? 106° temps, checking soon -- https://t.co/VzCp4Q29Ls— Dr. Pete Meyers (@dr_pete) November 11, 2016
I noticed lots of our pages dropped in ranking today.
I saw a massive spike from Googlebot in my log files. I thought it was a little odd.
I am seeing the same for both US ecomm sites I monitor--traffic is down 10-15% and has yet to bounce back since Tuesday
Most of the discussion though is around low conversions and this Google search snippet date bug.
Did you notice a Google update? Did your rankings or traffic change on Thursday? It seems small and not 100 degree weather from my opinion.