Felly sgrifennodd Graham P Davis :
Although the NAD may be weaker, it hasn't shut off yet. Before our weather
is affected, it needs the ocean current system in the North Atlantic to
flip from the stable system we have now to the other stable system.

Did you mean "... to another stable system."? Because what you says implies
that there are only two possible stable states; it also sort of implies that
we know what the other stable state is. Can we trace this through the
records of ice cores, ocean sediment, tree rings or whatever?

Adrian
--
Adrian Shaw ais@
Adran Cyfrifiadureg, Prifysgol Cymru, aber.
Aberystwyth, Ceredigion, Cymru ac.
http://users.aber.ac.uk/ais uk