May be just me in a different basin but who is listing "91C" as an invest? I have tried all normal outlets ( FNMOC, NRL, JWTC) etc and have had no luck....
Here are the old images kept up by NRL. It was an amazing storm, and at it's peak structure was arguably far more tropical than subtropical, and had a warm core for much longer than what would be expected with a polar low, and through a much deeper layer than that of an example of warm seclusion. At one point, the Scat vectors were easily 50 knots uncontaminated, and up to 85 knots rain-flagged!