Currently in Europe a blocking high, called an Omega Block, is situated over Western Europe due to a large bend in the jetstream causing heatwave conditions in England, Spain, Portugal, France, etc, with conditions likely to continue for at least several days.
What causes the increased waviness in the jetstream? The reduced temperature differential between the Arctic and mid latitudes. These conditions are similar to the 2003 heatwave that killed 70,000 people. People are more alert now, but there is still a high health risk, and of course an elevated fire risk. I reported on how climate change is affecting extreme weather including more intense heatwaves in Arctic amplification, the Jet stream and Extreme weather in Northern Hemisphere in March 2013.
A recent study published this year found that Seventy Five percent of heatwaves now attributed to climate change on a global level. Cities are also to get much hotter as heatwaves amplify the Urban Heat Island Effect.