This I completely agree with, from Goldman:
Q: You moved up your probability of a hike at the September meeting to 55% on Friday despite a below-consensus payroll number. Why?
A: Largely because the speech by Chair Yellen at Jackson Hole suggested a relatively low bar for this report. She said that “in light of the continued solid performance of the labor market and our outlook for economic activity and inflation, I believe the case for an increase in the federal funds rate has strengthened in recent months”. The condition was that the data must “continue to confirm” the committee’s outlook—not a very stringent test, in our view, because it signals a predisposition to think that the outlook is on track.