Couple of years ago, I suggested the main scene of change might be the mid-latitudes. It sure feels like that these days.
Yes, heatwaves used to occur on the North Sea shores. Every two or three years. Last year, a brief envelope of what is experienced now, 27th July '18. So hot, on the shores of sea-arm Haringvliet, perspective over the broad water seemed to bulge the surface down in strange sunset light.
Now, this kind of heat is back. Longer, more alarming.
Remember Dr. Francis' work on the Polar jet-stream? I think the consequenses of that pattern progressively reveal themselves. Bringing up warm upper troposphere air pockets from southern spheres, heated by sunlight right here.
The possibility was always there. But circumstances are now so much worse. It was just a matter of time to have these record-smashing waves around.
Let's see now whether this one will be transported by a vicious rossby-wave right into the Arctic...
Because IMHO that's how GAC'12 was ignited from the Pacific side.