Pennsylvania added an average of 1,300 jobs a month between September 2011 and August 2012. In light of that, September was a veritable tsunami of jobs, as the Pennsylvania Department of Labor and Industry explains:
Seasonally adjusted total nonfarm jobs in Pennsylvania were up 17,800 in September to 5,733,900, the largest monthly gain since February 2012. Following an upward revision to the August jobs count, Pennsylvania has shown a two-month gain of 23,800 jobs.
So what drove this month's very large increase in employment in Pennsylvania?