Thousand of acres have already gone up in smoke.
Also the humidity is VERY low -- not helping matters:
"The weather that we wrote about earlier today is no doubt the catalyst for this increase. The relative humidity was even lower than the forecast, bottoming out at 13 percent, very low for anywhere — extremely low for the eastern United States."
http://wildfiretoday.com/2016/04/18/rocky-mount-fire-closes-skyline-drive-in-shenandoah-np/