On Saturday, 3 October 2015 18:07:48 UTC+1, N_Cook wrote:

I see the NHC is now giving loss of hurricane status as late as
08oct 1200GMT at 48.5lat -26.0 long, which is not so far away. I wonder
how many hurricanes become ex, as close to the UK as that.

There has been work done on this by Bob Hart by defining a "cyclone phase space" to understand when a system has lost its warm, symmetric core. A starting point he

http://moe.met.fsu.edu/cyclonephase/

Richard