Hourwiz Explains · video notes
Super El Niño 2026: what it means for your winter
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“Super” isn't an official NOAA word. Forecasters use it as a nickname for a very strong El Niño, when the Pacific's Niño-3.4 region runs at least +3.6°F (+2.0°C) above normal. We downloaded NOAA's own index and charted it.
Our chart of NOAA's data
Our test. We downloaded NOAA CPC's classic Oceanic Niño Index (ONI) and its newer Relative ONI (RONI) on Oct 12, 2026 and compared the same season, July–September, across the big events. A data pull, not a forecast.
| Event | Jul–Sep value | First season at +2.0°C or more | Peak |
|---|---|---|---|
| 1982–83 | +1.8°F (+0.99°C) | Oct–Dec 1982 | +3.9°F (+2.14°C) |
| 1997–98 | +3.2°F (+1.79°C) | Aug–Oct 1997 | +4.3°F (+2.37°C) |
| 2015–16 | +3.1°F (+1.73°C) | Aug–Oct 2015 | +4.7°F (+2.59°C) |
| 2026 | +3.9°F (+2.16°C) | Jul–Sep 2026 | still developing |
Only three El Niños since 1950 crossed +2.0°C on the classic index. 2026 is the fourth, and it got there about a month earlier than any of them. It is not a record: 2015–16 peaked higher.
Two NOAA indices disagree this year. Since February 2026 NOAA's official index is the Relative ONI. On it, Jul–Sep 2026 reads +3.0°F (+1.69°C), so not “super” yet. We charted the classic index because it has the longest comparable history.
What it usually means for a US winter
- Why it happens: trade winds weaken, warm water slides east across the Pacific, and the jet stream shifts south.
- The South and Gulf Coast lean wetter. NOAA Climate.gov: the Gulf Coast ran wetter in more than 80% of El Niños over the past 100 years.
- The northern tier leans milder.
Odds, not certainty. NOAA calls El Niño's effect on winter “a matter of probability, not certainty”. For your town, check your local National Weather Service forecast.
Sources
Every fact on this page comes from these pages, opened on Oct 12, 2026. Things change: check the live page before you rely on it.
- NOAA CPC, ENSO diagnostic discussion (Oct 8, 2026) Current status and odds.
- NOAA CPC, Oceanic Niño Index data (classic ONI) Our chart: Jul–Sep 2026 = 2.16.
- NOAA CPC, Relative ONI data (RONI) Official index since Feb 2026: Jul–Sep 2026 = 1.69.
- NOAA CPC, RONI announcement
- NOAA CPC, El Niño and North American winter Wetter South, milder northern states.
- NOAA Climate.gov, how El Niño and La Niña affect the winter jet stream “A matter of probability, not certainty.”
- NOAA Climate.gov, United States El Niño impacts Gulf Coast wetter in more than 80% of El Niños.
- Columbia Climate School, “What exactly is a super El Niño?” (Jun 9, 2026) “Super” is a nickname for very strong.
Our chart uses NOAA CPC data as published on Oct 12, 2026; NOAA revises recent values. This is an explainer, not a weather forecast.
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