Here is an article about the heat wave in Europe: https://www.severe-weather.eu/global-weather/excessive-heat-...

I don't know enough about climate science, but south swell usually is the result of west-to-east storms coming off of Australia. In Hawaii, this summer's south swell has been extremely consistent big swells. I imagine it's something like the west coast off South America heating up causes the balance of the southern hemisphere off Africa to counteract that.