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Imagine the Pacific Ocean is like a giant bathtub. Sometimes the water in a special spot gets colder than usual (that’s called La Niña). Other times, it gets warmer than usual (that’s called El Niño).
Together, these warm and cold phases are part of a natural repeating pattern called the El Niño Southern Oscillation, or ENSO for short. It happens in a specific part of the Pacific Ocean.
Climate scientists had been expecting El Niño to show up in the spring. As months went by, more computer models (think: super-smart weather simulators) predicted it could be a “super” El Niño — a very strong one. But scientists warned it was too early to be 100% sure.
Then, in its June monthly update, the U.S. National Oceanic and Atmospheric Administration (NOAA) officially said: Yep, it’s here! They confirmed warmer conditions in a Pacific zone called Niño 3.4.
Important Point: To be called an El Niño, the water in Niño 3.4 must be at least 0.5°C warmer than average. Right now, it’s nearly 2°C above average — and we haven’t even hit the peak yet!
This is the warmest that region has ever been at this time of year.
Zeke Hausfather, a climate scientist at Berkeley Earth (a non-profit climate group), explained it simply:
He said: “Effectively, we’re already touching very strong El Niño conditions, and it’s early July still.”
Here’s what the forecasts say:
Hausfather warned: “We have a long way to go. We’re already brushing super El Niño territory, and we may well be in uncharted waters later this year.”
He even said we might break the old record by a “truly mind-blowing margin.”
Important Point: A few months ago, models showed a possible 4°C rise. Hausfather thought that couldn’t be right — but now it seems more possible.
Nat Johnson, a meteorologist at NOAA, said the switch was quick:
He said: “Why are we seeing such a big change this year? I think it’s still an open question.”
Good question! Johnson said:
Important Point: There is no scientific consensus yet on climate change’s role in this El Niño.
El Niño is no joke, says Hausfather. Here’s what to watch:
He said: “We should prepare for some pretty significant impacts — for agriculture, for the natural world, for ocean ecosystems.”
El Niño has arrived in the Pacific’s Niño 3.4 zone and is already near “super” strength at almost 2°C above average. It may peak in late 2023 at record-breaking levels. The shift from last year’s cool La Niña was fast, and scientists aren’t sure why. While its link to climate change is unclear, El Niño could bring droughts abroad and dry, fire-prone conditions in Canada. Get ready — it’s a big one!
Q1: What is Niño 3.4?
A: It’s a specific rectangular region in the central Pacific Ocean where scientists track warm/cool phases to decide if El Niño or La Niña is happening.
Q2: What makes an El Niño “super”?
A: When the ocean in Niño 3.4 gets about 2°C or more above average, some call it a “super” (very strong) El Niño.
Q3: Will Canada feel El Niño soon?
A: Not right away — the effects (milder, drier winter) show up in the winter months, with wildfire concerns in spring.
Q4: Did scientists know this would happen?
A: They predicted El Niño in spring, but the speed and strength surprised many; some early model numbers seemed too wild to be true.
Q5: Is this caused by climate change?
A: Not confirmed. Researchers see bigger swings but say there’s no consensus yet on climate change’s role.