diberry - 2:55 pm on Jun 9, 2012 (gmt 0)
Also, the June SERP changes thread reports a big shift around 1pm PST, 4pm PST and/or 10PM PST yesterday. [webmasterworld.com ] That probably accounts for the keyword shift.
But what I find so odd is that being up 94% until 1pm, my Google traffic dropped sufficiently that I ended up with 1.5% less visitors this Friday than I had last Friday. In fact, except for the holiday dip, there's never more than about 1.5% change on Fridays. Some days vary up to 16% from one week to the next (again, excluding the holiday dip), but that's the biggest variance I can find.
I honestly don't know if this is even close to statistically meaningful. I'm just offering it up in case it helps.