This heatwave across much of the northern hemisphere could continue for weeks, and possibly even months – accelerated warming in the Arctic compared to the rest of the planet could be a key contributor.

• NewScientist https://www.newscientist.com/article/2174889-warming-arctic-could-be-behind-heatwave-sweeping-northern-hemisphere/
• Jennifer Francis (Rutgers University), speaks March 2018 about weather changes. And how are those related to climate change? Full talk https://www.youtube.com/watch?v=U2FxJelkAtI
• Kai Kornhuber (Climate Analytics) 2016, explains Rossby waves, full release https://www.youtube.com/watch?v=MzW5Isbv2A0
• Jet stream https://en.wikipedia.org/wiki/Jet_stream
• Rossby wave https://en.wikipedia.org/wiki/Rossby_wave
• Q&A: How is Arctic warming linked to the ‘polar vortex’ and other extreme weather? https://www.carbonbrief.org/qa-how-is-arctic-warming-linked-to-polar-vortext-other-extreme-weather