Alternate
To answer your question fireflybob, to the best of my knowledge the US authorities have agreed to allow Ascension to be used for diversions and 1 scheduled flight every 2 weeks. Wideawake airfield is about 700 nmi away GC.
I really hope that procedures or systems can be found to get round the problem with the orthographic winds.
Does anyone know of other airfields besides Madeira where these kind of problems have to be overcome?