Questions people actually ask

“Super El Nino” isn't an official NOAA category — it's shorthand people use for an event that clears NOAA's top very strong band, generally an ONI or RONI reading at or above +2.0°C. Whether the current event gets there, and stays there, is exactly the kind of thing that shifts as new CPC data comes in each month, so we don't bake a yes/no into static text here. See what a "super" El Nino actually means for the full explanation, and the live dashboard for the current reading and strength classification.

It depends a lot on where you are. The broad composite tendency shifts the Pacific jet stream south, loading the dice toward wetter, stormier conditions across the southern tier of the US and warmer, drier conditions across the northern tier — but that's an average across many past events, and any single region, in any single year, can land differently. Regional impacts breaks it down region by region, with each area's specific tendency and how consistent that tendency has actually been historically.

Sometimes, in some places — never guaranteed. El Nino's wetter-leaning signal for places like California and the Southwest can genuinely help drought conditions there, and some past events delivered a wet winter that did real work on regional drought. But it's a tendency, not a promise: 2015-16 was one of the strongest El Ninos on record and still underdelivered on rain across parts of Southern California. And outside that wetter-leaning southern tier, El Nino isn't drought relief at all — it tends to push the Pacific Northwest and Northern Rockies drier, not wetter. See Regional impacts for your specific area.

Mainly because El Nino tends to increase upper-level wind shear over the tropical Atlantic, which makes it harder for storms to organize and strengthen — the main reason behind NOAA's below-normal 2026 Atlantic outlook. See El Nino & the 2026 Atlantic hurricane season for the full mechanism, including why the Eastern/Central Pacific tends to see the opposite effect in the same kind of year.

Most El Nino events peak during Northern Hemisphere winter, typically somewhere in the November-through-January window, before fading through spring — but that's a climatological tendency, not a fixed date, and the exact timing varies event to event. For where this event currently stands and CPC's latest guidance on the expected peak, check the live dashboard or the dated event timeline.

ONI (Oceanic Nino Index) measures the Nino 3.4 sea-surface temperature anomaly against a fixed historical baseline. RONI (Relative Oceanic Nino Index) subtracts out the broader tropical ocean's own warming trend, so it's not gradually inflated by decades of basin-wide warming the way raw ONI can be. NOAA made RONI its operational monitoring index on February 1, 2026, and still publishes ONI alongside it. See ONI vs. RONI, explained for the full breakdown, including why the two numbers often don't match for the same season.

No. Nino34 is an independent, educational site, not affiliated with NOAA, the Climate Prediction Center, or IRI. We build every number here from NOAA/CPC and IRI's own public data products, but we are not those agencies, and nothing on this site is an official forecast, watch, or warning. For those, go straight to CPC's ENSO Diagnostic Discussion.

It depends on the source, because different NOAA/CPC feeds run on different clocks. Weekly SST readings refresh about once a week; the core ONI/RONI tables and probability outlooks update monthly; the CPC ENSO Diagnostic Discussion comes out on the second Thursday of each month. Every number on this site carries a real "data as of" timestamp, and if a feed runs past its normal update window, we show a staleness notice on the page itself rather than quietly leaving old data looking current. See Methodology for exactly how that staleness handling works, and Sources for the full source list and each one's cadence.