According to a recent article in Nature.com, rapidly intensifying tropical cyclones and max wind speeds have significantly increased since 2001 along the US East Coast due to anthropogenic greenhouse gas emissions which have warmed the planet and oceans.
The 1995 to the present curve is higher than the previous recorded events and shows no sign of abating. From a non-partisan point of view on the climate warming debate, it seems a bit early to completely discount the effect of anthropogenic greenhouse gas emissions.
1995 is when the AMO made the shift from the cold to the warm phase and has continued warm ever since and was particularly warm this year. Anthropogenic greenhouse gas emissions do play a part, however, it is the AMO that is the major control factor here. During strong AMO years there is a 400% + increase in Major Hurricane days.