Imagery shown above indicates that the strongest part of Debby, AKA the rain shield, has been torn away from the center of circulation. The circulation is currently just south of the Florida Panhandle, while the rain is southeast of Georgia at this time. Because the protection of rain and storms around the center are gone, weakening appears likely and has been happening overnight, from 60 MPH to 50 MPH wind speeds.
Debby's center of circulation is also large for a tropical storm and loosely defined. Considering all of what I typed above, it seems more than likely that some additional weakening should occur.