Issac is current following the proper angle between sunspot AR 1553 and AR 1555. That diadonal line is the same. Once the "mid way" point between the 2 sunspots is directly facing Earth, Issac will turn East. It will then follow a path that, when it's remnants leave the North American Continent, it will be the same time AR 1555 passes the limb and turns to the far side of the Sun.
When Irene ran the east coast last year, AR 1271 emerged from the limb of the Sun and was spinning. They called it a shape-shifting sunspot. As this sunspot crossed the face of the sun, Irene was right behind traverving the east coast. When Irene left the N.A. Continent, it was at the same time the sunspot passed the limb and turned to the far side of the Sun.
While there's no proof of any connections, sometimes the High pressure that creates a tropical storm or hurricane, it can correlate with the emergence of a sunspot. Not just on the face of the Sun, but on the farside. Fairly close to the limb, just before it turns to the Earth facing side of the Sun.
See for yourself: spaceweather.com (august 16, 2011) through (august 29, 2011) and as a bonus watch my prediction before fact.