Niño 1+2 (coastal Peru/Ecuador): +3.3°C — This extreme anomaly off South America is the hottest of any Niño region and reflects a strongly east-based event . Other regions: Niño 3 at +2.4°C, Niño 4 at +0.3°C .

Subsurface heat: NOAA expanded its anomaly scale to 8°C — To capture the extraordinary warm pool beneath the equatorial Pacific, NOAA increased the maximum of its subsurface temperature anomaly color scale to 8°C. Subsurface Kelvin Wave anomalies are exceeding 9°C in some areas, fueled by record westerly wind bursts .

Weekly escalation: +1.5°C → +1.8°C — The Niño 3.4 index has climbed sharply over consecutive weekly readings, reflecting an accelerating coupling between the ocean and atmosphere .

Atmospheric Indicators

Southern Oscillation Index (SOI): The SOI declined to -24.9 in June 2026 and was at -30.0 (30-day) as of mid-July . The Australian Bureau of Meteorology reports this is the lowest SOI in over 40 years, confirming a severely weakened Walker circulation . While your figure of -2.68 may reflect a different calculation or standardized index, the standard SOI is on a scale where -30 is exceptionally negative and far past typical El Niño thresholds.

Westerly wind anomalies: Record-strong westerly wind bursts are driving the subsurface Kelvin Wave, contributing to subsurface temperature anomalies exceeding 9°C as the wave propagates eastward .

Forecasts and Probabilities

NOAA's 97% persistence probability: The August 11 ENSO diagnostic discussion states there is a 97% chance El Niño will persist through early spring (February–April) 2027 . The event is expected to strengthen through the end of 2026 .

Peak anomaly projections: Long-range model simulations from multiple leading centers indicate Niño 3.4 anomalies could exceed +3°C between October and December 2026, with some projections approaching +4°C — which would make this the strongest El Niño since reliable satellite records began in 1979 . NOAA gives an 81% chance of "very strong" (≥+2.0°C) conditions in October–December 2026 .

Madden–Julian Oscillation (MJO): An incoming MJO pulse is expected to further enhance westerly wind anomalies and could push the Niño 3.4 value past +2.0°C within days .

Atlantic Hurricane Season Impacts

NOAA's August 6, 2026 updated outlook: NOAA calls for a 75% probability of a below-normal Atlantic hurricane season, citing the strengthening Super El Niño as the primary factor that will suppress tropical activity through the season's peak . The outlook predicts 7–13 tropical storms, 2–6 hurricanes, and up to 2 major hurricanes (Category 3+) . Colorado State University's final August update similarly forecasts only 9 tropical storms and 4 hurricanes, with just 1 major hurricane .

Winter 2026–2027 Outlook for North America

Strong El Niños typically produce a sharpened and amplified Pacific jet stream that extends across the southern tier of the United States, creating an active storm track with above-normal precipitation from California through the Gulf states and Southeast, while Canada and the northern states experience warmer-than-normal conditions. NOAA's seasonal outlooks will be updated in the coming weeks, but the canonical El Niño teleconnection pattern is well established: an amplified jet stream with a southern U.S. storm track and warmer conditions over southern Canada and the northern U.S. is the standard winter fingerprint for a strong east-based event of this type.

Key uncertainty: While all indicators point toward a historic event, the ultimate peak intensity remains uncertain. Some models project anomalies approaching +4°C, but the exact peak and whether it surpasses 1997–98 (peak +2.4°C in the conventional ONI) or 2015–16 (+2.6°C) will depend on continued westerly wind burst activity and ocean-atmosphere coupling over the next 2–3 months.

Niño 1+2 (coastal Peru/Ecuador): +3.3°C — This extreme anomaly off South America is the hottest of any Niño region and reflects a strongly east-based event . Other regions: Niño 3 at +2.4°C, Niño 4 at +0.3°C .

Subsurface heat: NOAA expanded its anomaly scale to 8°C — To capture the extraordinary warm pool beneath the equatorial Pacific, NOAA increased the maximum of its subsurface temperature anomaly color scale to 8°C. Subsurface Kelvin Wave anomalies are exceeding 9°C in some areas, fueled by record westerly wind bursts .

Weekly escalation: +1.5°C → +1.8°C — The Niño 3.4 index has climbed sharply over consecutive weekly readings, reflecting an accelerating coupling between the ocean and atmosphere .

Atmospheric Indicators

Southern Oscillation Index (SOI): The SOI declined to -24.9 in June 2026 and was at -30.0 (30-day) as of mid-July . The Australian Bureau of Meteorology reports this is the lowest SOI in over 40 years, confirming a severely weakened Walker circulation . While your figure of -2.68 may reflect a different calculation or standardized index, the standard SOI is on a scale where -30 is exceptionally negative and far past typical El Niño thresholds.

Westerly wind anomalies: Record-strong westerly wind bursts are driving the subsurface Kelvin Wave, contributing to subsurface temperature anomalies exceeding 9°C as the wave propagates eastward .

Forecasts and Probabilities

NOAA's 97% persistence probability: The August 11 ENSO diagnostic discussion states there is a 97% chance El Niño will persist through early spring (February–April) 2027 . The event is expected to strengthen through the end of 2026 .

Peak anomaly projections: Long-range model simulations from multiple leading centers indicate Niño 3.4 anomalies could exceed +3°C between October and December 2026, with some projections approaching +4°C — which would make this the strongest El Niño since reliable satellite records began in 1979 . NOAA gives an 81% chance of "very strong" (≥+2.0°C) conditions in October–December 2026 .

Madden–Julian Oscillation (MJO): An incoming MJO pulse is expected to further enhance westerly wind anomalies and could push the Niño 3.4 value past +2.0°C within days .

Atlantic Hurricane Season Impacts

NOAA's August 6, 2026 updated outlook: NOAA calls for a 75% probability of a below-normal Atlantic hurricane season, citing the strengthening Super El Niño as the primary factor that will suppress tropical activity through the season's peak . The outlook predicts 7–13 tropical storms, 2–6 hurricanes, and up to 2 major hurricanes (Category 3+) . Colorado State University's final August update similarly forecasts only 9 tropical storms and 4 hurricanes, with just 1 major hurricane .

Winter 2026–2027 Outlook for North America

Strong El Niños typically produce a sharpened and amplified Pacific jet stream that extends across the southern tier of the United States, creating an active storm track with above-normal precipitation from California through the Gulf states and Southeast, while Canada and the northern states experience warmer-than-normal conditions. NOAA's seasonal outlooks will be updated in the coming weeks, but the canonical El Niño teleconnection pattern is well established: an amplified jet stream with a southern U.S. storm track and warmer conditions over southern Canada and the northern U.S. is the standard winter fingerprint for a strong east-based event of this type.

Key uncertainty: While all indicators point toward a historic event, the ultimate peak intensity remains uncertain. Some models project anomalies approaching +4°C, but the exact peak and whether it surpasses 1997–98 (peak +2.4°C in the conventional ONI) or 2015–16 (+2.6°C) will depend on continued westerly wind burst activity and ocean-atmosphere coupling over the next 2–3 months.