With a North Atlantic THC shutdown, we'd expect to see cooling, not anomalous warmth, in Scandinavia and the British Isles. In fact, given the observed loss of a number of THC current "chimneys" in the last two years, it's much warmer than I would have expected.
I'd go looking for anomalies with the
polar currents and weather vortex, instead. Much less is known about the dyamics of the weather of the extreme north, but this kind of exact-hemisphere extreme difference is startling -- especially given the overall warmth for the entire rest of the world. I would expect prevailing south-to-north winds to develop as the atmosphere turns into a heat pump. Perhaps they have already done so over the Americas. (Sub-equatorial north-to-south winds would develop a little later, since the southern hemisphere is somewhat more stable than the north -- although it, too, is starting to experience major changes beyond Antarctic ice melting and rafting.)
The excessive heat over North America and the northeastern Atlantic basin, as well as off the western coast of Africa, does not bode well for the early part of hurricane season. With any luck, this does not reflect sea-surface anomalies, and the Atlantic will be cooler this summer.
There is a little good news -- it means that a lot of the thawed permafrost has re-frozen, even in extreme North America. But the progress of that phenomenon has been unmistakable, and we should be on the lookout for an early thaw next month.
By the way, it got up to about 75F here in suburban Philly. Is anyone taking bets that we'll have a major snowstorm between next week and the first week of April?

--p!