Jet stream interaction and undergoing extratropical transition. Frontal or troughs can cause it. I have seen this happen in the Gulf of Mexico, usually late in the season. Also, they tend to get larger.
Frontal


CrazyC83 wrote:If satellite images existed of pre-satellite era storms, I think even the 1938 hurricane and Hurricane Hazel would look like "crap" on satellite at landfall. If I recall data based on land observations, Carol (1954) was the most "tropical" of all the northern hurricanes, probably because of its small size, fast movement and Gulf Stream track (basically, that is the NE US analog to 2003's Juan in Nova Scotia).
I can picture any of those East Coast storms in the past looking like that on satellite including 1903 Vagabond Hurricane and 1821 Norfolk and Long Island hurricane.