The jetstream is being disrupted. Unusual warm air in one place will displace cold air in another place, like squeezing a balloon, squeeze one part and it will bulge out on the other side. Via convection, warm air wants to push its way north in our hemisphere, and that's what causes it. But some people will tell you climate change isn't real because there is cold involved, not understanding that it's cold air displaced from northern latitudes. Those people who deny climate change can't understand something as simple as a water balloon.