The following figures show the trajectories in the domain, at different times. The drifters are released at every 10 grid points. The grid has a model resolution of 200m. These trajectory computations are for a time window of 6 or 24 hours for the forecast of 17 Aug 1200Z to 18 Aug 1200Z 2017 (17 Aug 0800 EDT to 18 Aug 0800 EDT 2017). The window center shifts in 1 hour intervals.
As a reminder, 12:00Z = 08:00 EDT, i.e., local time is 4 hours behind Zulu time.