Other factors have to be considered as well -- is there enough organization to the activity? Are upper-level conditions favorable for regeneration (low shear)? What about sea-surface temperatures? Is there dry air in the mid-levels to inhibit strengthening? And, ofr storms exiting off of the coast, how much of the remnant storm is left that can reorganize again? There are more factors, so these are just a sample.

With Ivan, there is a preponderance of dry air in the region (resulting in some very nice weather in the southeast, I might add!) and upper-level conditions are not particularly favorable for redevelopment. Plus, the remnant circulation isn't in great shape and water temperatures off of the Delmarva, where it exited land, are not particularly high (warm, yes, but marginally sufficient).

It's a moot point, though, as the remnant storm is exiting off to the northeast into the maritimes as an extratropical system. I think we've seen the last of Ivan, thankfully.

As another aside, the high building in behind Ivan is giving those up and won the eastern seaboard a taste of winter -- somewhat of a cold-air damming event. The cloud cover isn't there, thankfully, but temperatures are chilly for this time of year into the Carolinas. Later in winter, if something like this set up (a bit further to the east and stronger, though)...it'd be downright cold all the way to the Gulf coast, with highs struggling to reach 50 even here in north Florida on occasion.

But back to hurricane season...