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.

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

I think you might be on to something: I am by no means a weather enthusiast or expert, nor do I live in California: the El Niños building up in 1997 and 2015 had similar seasons, 2023 not, the current fast onset and wave seasons (durable good surfable waves in winter) match especially well with 2015. 2023 was the exception but also slower onset. Also La Niña winters also had good winter conditions, but not as durable. So good surf conditions in NorCal outside of La Niña winters might be a visceral leading indicator for fast onset El Niño.

Check out stormsurf001 on YouTube. He’s been tracking the development of the El Niño for months now.

I (SoCal) kinda hate El Niño. Seems like it always means way more weather (blown out days) and most reefs around here are maxed out beyond overhead. It’s nice to get lots of groundswell but I’ll take 2-3 and high pressure over 6-7 and rainy any day.