I'm very sceptical about the accuracy of this I'm afraid. Have you used proper feeds from buoys over this period? The SST maps are pretty notorious for inaccuracy, but a cursory glance at the charts suggests SSTs for the northern hemisphere are extremely high this year. What might be interesting is for you to do a comparison of the eastern seaboard, and GIN corridor. Now why, I wonder, would you have plumped for the Faroe Islands as your example ...?