A couple of things would give me hope:

1) thru-hikers are working their way north so if he's near the trail someone should be along.

2) the weather has warmed, nights are not cooling off as much in the mid-Atlantic. Based on our temps in DC and adjacent to Shenandoah National Park in the northern section of the Blue Ridge, I'd guess his overnight low temps have been in the 40s on the AT.

I hope he's okay. We've had considerable rain the past couple days, so it would be slippery on the rocks. Thanks for posting the information.