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So the heatwave in Europe right now is caused by a phenomenon called a heat dome. It's a huge area of high atmospheric pressure, which has enough influence that it forces the Jet Stream to divert around it. The unusual Jet Stream behaviour is drawing hot air North from the Sahara, which is making Europe so abnormally hot.
Apparently, some meteorologists nickname this an omega block, because it blocks off the Jet Stream and pulls it into kind of a Ω shape.
Earth: I shall have a nice stable Jet Stream to help regulate my climate
Humans: 
Earth: 
〜oh no
@InvaderXan Do you know if this is temporary?
@samftblaetr This one is persistent but temporary. Though I have no idea how likely it is for another one to form.