Any time this stuff comes up it's important to understand that this el Nino is occuring in the context of a global climate that is warmer than any time in the last 125,000 years. The risks inherent to weather and climate are growing all the time.
I find the Climate Reanalyzer graphs very instructive - at a glance one can see how extreme the situation is:
This video mainly covers how it works in the United States, here's one for Brazilian people in the HN, from Manual do Mundo
Title: A short explainer on how El Niño works in US [video] (youtube.com)
Actual title is "El Niño Winter 2026–27: What Pilots Should Expect"
Not that the cause is known yet but I’d been curious how this El Niño would affect flying after that terrible Florida Leer Jet crash. Great video!
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Here is one is French, very scientifically sourced, by a searcher of hugging face.
https://youtu.be/DutKGuQu4a0
France isn't very much affected, so it's not focused on any country.