# NOAA declares El Nino on June 11 as the Pacific moves from La Nina with Nino 3.4 reaching plus-1.7 degrees Celsius > The tropical Pacific completed its La Nina-to-El Nino transition in spring 2026; forecasters give a 63% chance the event strengthens to very strong status by autumn, reshaping global rainfall and hurricane patterns **Meta:** type: event · date: 2026-06-11 · heads: 무엇이 무너졌는가, 장기전 · 6 takes · 3 lenses · 2 regions ## Summary The US National Oceanic and Atmospheric Administration issued an El Nino Advisory on 11 June 2026, officially declaring that El Nino conditions had developed in the tropical Pacific after the [La Nina](/ko/entity/la-nina) phase that peaked in late 2025. The Nino 3.4 sea surface temperature (SST) index, covering a key region of the central equatorial Pacific, rose from +0.48°C averaged over March-May 2026 to +0.94°C in May and reached +1.7°C in the weekly reading centred on June 17. NOAA gives a 63% probability that SSTs will exceed the 2.0°C threshold defining a very strong El Nino event by autumn 2026, with further intensification through Northern Hemisphere winter 2026-27. The rapid transition from La Nina to a potentially very strong El Nino in a single year is unusual and has direct consequences for global precipitation patterns, Atlantic hurricane activity, West Africa monsoon variability, and Australian rainfall. ## The split US weather and climate media focused on the implications for the 2026 hurricane season, where El Nino's wind shear effects reduce Atlantic storm formation, and for the US Pacific Northwest wheat crop, where an El Nino winter typically brings drier-than-normal conditions. Australian media tracked the potential for a return of El Nino-associated drought after two La Nina wet years. South Asian coverage noted implications for the Indian monsoon, which El Nino can suppress in some configurations. African climate organisations highlighted impacts on East Africa and the Sahel, where El Nino tends to produce mixed effects on different sub-regional precipitation regimes. Indonesian and Philippine media tracked potential drought risks for the upcoming agricultural season. ## By the numbers - June 11, 2026, date NOAA issued the El Nino Advisory - +1.7°C, Nino 3.4 SST anomaly in the June 17 weekly reading - 63%, NOAA probability of exceeding 2.0°C (very strong El Nino threshold) by autumn 2026 - +0.48°C, March-May 2026 Nino 3.4 average SST anomaly (La Nina threshold is below -0.5°C) - La Nina conditions prevailed through late 2025 before the rapid transition ## Why it matters The speed and potential strength of the 2026 El Nino event is significant because it follows two consecutive [La Nina](/ko/entity/la-nina) years and because a very strong or historically strong event has global consequences: droughts in Australia, Indonesia, the Philippines, and southern Africa; flooding in the southwestern US and Peru-Ecuador; altered Atlantic hurricane tracks; and impacts on global crop production. For food security assessments, a very strong El Nino arriving during an already tight global corn stocks environment amplifies the tail risk. The event's timing also affects the 2026 West Africa Sahel rainy season and the 2026-27 South Asian monsoon. ## What to watch - NOAA monthly ENSO diagnostic discussions through autumn and winter 2026 - Whether the 2026 El Nino reaches 2015-16 intensity levels (the historical benchmark for very strong events) - Crop condition updates from Australia, Indonesia and South Africa as El Nino-associated dryness develops - Atlantic hurricane season tracking from August through November 2026 ## Regional takes (batched by bias / lens) ### unlabelled - **NOAA (ENSO Advisory)** (United States, en) — NOAA official press release, June 11, 2026: El Nino Advisory issued. El Nino conditions have developed in the tropical Pacific. Weekly Niño 3.4 index centred on June 17 reached +1.7°C. Forecasters project a 63% chance of SSTs exceeding 2.0°C (very strong El Nino threshold) by autumn 2026, with strengthening expected through Northern Hemisphere winter 2026-27. Source: https://www.noaa.gov/news-release/el-nino-forms-expected-to-strengthen-say-noaa-forecasters - **IRI (International Research Institute for Climate and Society)** (United States, en) — Source: https://iri.columbia.edu/our-expertise/climate/forecasts/enso/current/ - **ECMWF** (Europe, en) — Source: https://www.ecmwf.int/en/about/media-centre/science-blog/2026/measuring-strength-el-nino - **NOAA NCEI** (United States, en) — Source: https://www.ncei.noaa.gov/access/monitoring/enso/sst ### US climate monitoring - **NOAA CPC** (United States, en) — NOAA Climate Prediction Center ENSO Diagnostic Discussion: observed Nino 3.4 SST anomaly reached +0.48°C during March-May 2026, rising to +0.94°C in May and +1.7°C in the weekly index by mid-June. CPC expects the event to intensify to moderate or strong level by Northern Hemisphere autumn. > "El Niño forms, expected to strengthen, say NOAA forecasters." Source: https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/ensodisc.shtml ### climate model projections - **NOAA GFDL** (United States, en) — GFDL model-based June 2026 El Nino predictions confirming the strengthening trajectory and projecting impacts on Northern Hemisphere winter precipitation patterns: drier than normal in the Pacific Northwest and wetter than normal across the US Gulf Coast and Southeast, with global teleconnections affecting East Africa, Southeast Asia and Australia. > "June 2026 El Nino predictions from NOAA's Geophysical Fluid Dynamics Laboratory." Source: https://www.gfdl.noaa.gov/prediction/june-2026-el-nino-predictions/ ## Across the graph - Entities: La Nina --- Canonical: https://rbtfl.xyz/ko/n/la-nina-el-nino-transition-2026