Nah that's not a typo... Even with increased vertical wind shear and dry air into Irma, the water off the SE US is considerably warmer than normal, the steering pattern, lacking a deep, large-scale/positively tilted trough, and given that Irma is probably going to be a large and powerful category 4 or 5 hurricane in the northern Bahamas, it will take a lot of time for Irma to spin down... Considering Irma might actually become even stronger than 160 knots in the Bahamas before it begins to interact w/ the ULL as a substantial poleward outflow channel develops to its north and oceanic heat content gets even higher, there's definitely a good chance to remain a category 4 hurricane if hits the Carolinas.