For those of us who have had several days off this past weekend (not including last week), It’s possible that there was a Google update mid to late last week.
We saw a number of search fluctuations and comments on the forums alluding to something like this happening.
We observed Semrush with a sensor score (sensor is their Google algorithm update tracking tool) of around 6.0. Most sensor scores 5.0 and above can be considered an update worth reporting on.
We also observed a number of comments in the WebmasterWorld forums about a possible update, with many members experiencing traffic and ranking fluctuations, beginning around June 17th: