So its the fourth largest fire. That comes from fire suppression. What does the great Penn State University say about fire in the forest, 2oak? See:
http://www.docs.dcnr.pa.gov/cs/groups/public/documents/document/dcnr_004096.pdf
"A history of wildfire suppression efforts, such as fighting every fire possible, has contributed to an accumulation of forest fuels and, thus, a higher risk of wildfires in some areas of the United States. In western forests where fuels have accumulated over time and do not rot because of dry conditions, fire is increasingly common."
So keep advocating total suppression and one of these days...