The atmosphere scientist Jennifer Francis has been talking about how polar amplification is reducing the temperature difference between Arctic and temperate regions and this is causing changes to the jet stream which is now meandering much more, when the jet stream meanders, it pulls colder arctic air south with it which results in these kinds of extreme events. The same phenomenon caused the blocking systems that led to Houston getting flooded after Hurricanes Harvey in 2017, and another blocking system caused Superstorm Sandy to travel up the east Coast of the USA instead of traveling east across the Atlantic as most gulf hurricanes tend to do
A paper recently published warns that the slow down of the polar vortex and diminishing temperature gradient between the poles and tropics will also lead to worse and longer lasting summer heatwaves in the US. We have seen that the Texas energy infrastructure is vulnerable to cascading failures, If there is a similar power grid disruption in an extreme heatwave, many people will die from heatstroke
https://www.nationalgeographic.com/e...ged-heat-waves