Why has Europe had such severe heatwaves?

The surge of cold meltwater into the North Atlantic is altering ocean temperatures and shifting the jet stream to favour heatwaves in western Europe and the Mediterranean, a study undergoing peer review has found. As Greenland ice loss accelerates, Europe may suffer more frequent and intense heatwaves than climate models currently predict.
Read more: https://www.newscientist.com/article/2585659-greenland-meltwater-is-intensifying-european-heatwaves/