Two years after a launch accident (er, "unscheduled disassembly") at Wallops VA, the return to flight is finally here. There is an ISS resupply launch tonight just after dark at 8:03 PM EDT. Weather at the moment looks good. Should be visible for much of the mid-atlantic US east coast. More info here
, and there should be various live streams of the launch online.
Look to the SE. It will be at low elevation, so look for a spot with a low horizon. A fist held at arm's length subtends about 10 degrees. Depending on your location, it should be visible about 30s after launch.
Use this OA-5_Viewing.kmz
file in Google Earth to simulate the view from your location.
Here is an example for a ball field in Bethesda, MD:
And Boston Common:
Here's a composite
of several 20s exposures of a Wallops launch as seen from north of Baltimore in 2013. Ken has a really nice photo of this launch from D.C. The actual rocket plume will look like a bright, possibly flickering, moving dot. You might also be able to see the first stage burnout and coast, followed by the second stage ignition.