The G-IV is scheduled to fly a synoptic surveillance mission this afternoon, with a takeoff time of 1730 UTC (1:30pm EDT) from MacDill AFB. The G-IV will be sampling the mid-upper trough along the U.S. southeast coast and doing a circumnavigation around Isaac. Here’s their track. The track is not exact and may shift as the storm moves. The dots represent the GPS dropsonde launch locations.