Seasonal Weather Outlook, Saturday 4 July 2026
El Niño has arrived. The question traders need to answer is how strong it becomes by winter, and the answer is looking increasingly alarming.
ENSO and Teleconnections
NOAA's latest ENSO Diagnostic Discussion confirms El Niño conditions are now present, with the Niño-3.4 weekly sea surface temperature anomaly at +2.1°C as of June 24, already in the strong-event range. The Niño-1+2 index, the easternmost indicator and a leading signal of event intensity, sits at +2.1°C. Subsurface heat content across the central and eastern equatorial Pacific remains significantly above average to depths exceeding 200 metres, providing the thermodynamic fuel for further intensification.
The North American Multi-Model Ensemble forecasts El Niño to strengthen through boreal summer and peak in the Northern Hemisphere winter 2026-27. NOAA puts a 63% probability on a very strong event during November–January, one that would rank among the largest El Niño events in the record since 1950. C3S's June-initialised grand ensemble is starker still: 75% of members exceed 2.5°C amplitude in the Niño-3.4 index by November. Historical precedent suggests the models with the lowest amplitude in this type of forecast tend to underestimate the final peak.
The atmospheric coupling is already evident. Low-level westerly wind anomalies and upper-level easterly wind anomalies are in place over the central equatorial Pacific. Convection is above average near and east of the Date Line, suppressed over Indonesia, the classic Walker Circulation pattern that locks in El Niño persistence.
Against this backdrop, the other teleconnection indices present a mixed picture. The NAO is at -0.31, effectively neutral, with the GEFS 16-day ensemble keeping it oscillating between -0.12 and +0.15, no sustained blocking signal in the near term. The AO starts the period at +0.61 and the ensemble shows it climbing toward +1.89 by the end of the 16-day window. A positive AO through mid-July means the polar vortex remains relatively contained, keeping Atlantic storm tracks suppressed across northern Europe.
The QBO at 50 hPa is easterly at -1.5 m/s. This matters for winter positioning. The Holton-Tan mechanism links easterly QBO phase to a weaker wintertime polar vortex, which in turn tends to favour negative NAO, increased Scandinavian blocking, and colder conditions across northern and central Europe. It does not guarantee any specific outcome, but it raises the odds of the vortex disruptions that have driven European gas price spikes in recent winters. Combined with a very strong El Niño, itself associated with a warmer and weaker vortex in some analogues, the net signal is genuinely uncertain, and that uncertainty carries a bullish asymmetry for European winter gas.
The MJO is in Phase 3 at amplitude 0.3, essentially too weak to draw meaningful implications from. The PDO remains firmly negative at -9.90, a persistent background state that can moderate El Niño's warming impact over the North Pacific.
Six-Week Temperature Trajectory
The dominant near-term story in the EC46 ensemble is a broad cooling signal for northwest Europe in the second week of July. Compared to yesterday's run, Amsterdam has adjusted 4.7°C cooler for July 10, Frankfurt 4.0°C cooler for July 9, London 3.3°C cooler for July 8, and Paris 3.0°C cooler for July 9. Week 2 ensemble spreads are wide: Amsterdam sits at 17.5–26.1°C, Frankfurt at 20.0–28.7°C. The model is flagging high uncertainty around whether the trough driving this cooling cuts into the continent or stalls over the North Sea.
Beyond week 2, northwest European temperatures stabilise in the 19–22°C range through weeks 3–6, close to seasonal norms, with Amsterdam tracking 19.0–19.6°C and London 19.0–19.8°C. The spread narrows progressively, suggesting the ensemble converges on a largely unremarkable remainder of July and early August for power demand purposes.
Frankfurt's week 2 peak median at 24.4°C, with the upper ensemble tail at 28.7°C, is the one scenario worth monitoring. If the warm tail verifies, central European cooling demand could spike before the subsequent cool-down. The ECMWF 10-day ensemble maintains warm probability tilts for Amsterdam (warm-1sd probability averaging 64.7%) and Frankfurt (50.9%), consistent with the background El Niño influence on European summer.
Houston's trajectory stands apart. The EC46 shows a steady warming trend: 29.1°C in week 1, rising to 30.4°C by week 5, with a tight ensemble spread across the period (28.2–31.9°C in week 4). This is not uncertainty, it is the ensemble agreeing on a sustained hot signal for the Gulf Coast through August. NOAA's JAS seasonal outlook confirms above-normal temperatures are favoured for the Lower Mississippi Valley and Southeast, consistent with El Niño's typical summer signature for this region.
Japan's near-term signal is also warm and relatively constrained. Nagoya runs 23.9°C in week 1, stepping up to 26.7°C by week 3 and holding near 26.3°C through week 6. Osaka mirrors this profile. The spread is moderate (24.7–29.1°C at Nagoya week 3), consistent with summer conditions that sustain LNG import demand for power cooling.
Southern Hemisphere cities are in their mid-winter trough. Adelaide sits at 9.8–11.5°C across weeks 1–6, Melbourne at 8.1–10.5°C, Brisbane slightly warmer at 14.5–16.5°C. Slowly warming trajectories into August are typical for this season, with no anomalous cold signal evident.
Regional Seasonal Outlooks
For Europe, the seasonally significant tension is between the warm-season background state, which the ECMWF ensemble captures in those warm probability tilts, and the winter risk embedded in easterly QBO combined with a very strong El Niño. The summer signal is muted: northwest Europe is unlikely to see the extreme heat anomalies of 2022 or 2023, with the broad consensus of agency outlooks pointing to near-to-above-normal temperatures but without the sustained 35°C+ events that drove power demand records. Madrid's EC46 trajectory at 27.9–30.6°C across six weeks is consistent with a warm but not extreme Iberian summer.
For the United States, NOAA's JAS outlook is unambiguous about the west: above-normal temperatures are favoured across the Pacific Northwest, and the pattern extends through the western CONUS. The Southeast and Eastern Seaboard also carry above-normal temperature probabilities, with the highest odds along the coast of New England. Precipitation tilts toward below-normal across the Southern Plains and Lower Mississippi Valley, relevant to hydro resources and natural gas demand for irrigation pumping in Texas and the Gulf Coast region.
East Asia summer demand drivers are supportive of LNG imports into Japan and South Korea through August. JMA's seasonal outlook context favours above-normal temperatures across most of Japan through the summer, consistent with the EC46 Osaka and Nagoya trajectories. For South Korean LNG demand, the combination of warm summer and El Niño's typical winter warming effect on the Korean Peninsula creates an interesting asymmetry: summer JKM demand support, but El Niño winters tend to be milder in northeast Asia, which could soften H1 2027 contract pricing.
India's monsoon timing carries the most uncertainty in the El Niño context. Historically, strong El Niño events correlate with delayed or weaker Indian monsoons. Mumbai's EC46 trajectory is stable at 25.8–26.8°C across six weeks, monsoon cloud cover moderating temperatures, but the key variable is total precipitation, not temperature. A deficit monsoon would sustain elevated cooling demand and power burn. No ECMWF seasonal data specific to India's rainfall outlook is available in current sources.
Brazil's hydro situation remains a medium-term concern for LNG-exposed power markets. El Niño typically produces drier-than-normal conditions across southern Brazil while shifting rainfall toward the northeast, creating spatial asymmetry in reservoir levels. The EC46 shows São Paulo at 8.2°C in week 2, within a normal Southern Hemisphere winter range, giving no near-term hydro signal.
Strategic Positioning
- European winter gas (TTF Cal-27): Easterly QBO + developing super El Niño creates genuine uncertainty around polar vortex stability in DJF 2026-27. History does not resolve cleanly to a single outcome, but the frequency of vortex disruptions under easterly QBO raises the tail probability of cold-blocking events. The asymmetry favours holding some winter gas upside exposure through summer.
- US power (ERCOT, PJM, MISO summer): NOAA's JAS above-normal temperature signal for the South and East is confirmed by EC46. Houston's tight warm ensemble into August supports Henry Hub power-burn demand. Watch MISO Indiana Hub and PJM Western Hub for heat event premiums in weeks 3–4 if the European cool-down extends troughing into the US Midwest.
- JKM summer curve: Japan and South Korea cooling demand remains supported through the EC46's 6-week window. A very strong El Niño's warm summer signature for northeast Asia keeps the near-term demand floor firm.
- NW European power (week 2): The sharp EC46 downward revision for Amsterdam and Frankfurt around July 8–10, with spreads of 8–9°C between ensemble members, flags a potential brief cooling demand drop in the German and Dutch markets mid-month. Near-term bearish for day-ahead EDF/baseload; worth monitoring on the 00Z updates.
- Brazil hydro / LNG Pacific: El Niño's typical southern Brazil drying pattern warrants watching through Q3. A weak hydro season by September would increase Brazil's LNG draw and tighten Pacific basin spot supply ahead of the Asian winter ramp.
- ENSO intensity revision risk: The gap between the low-end models and the C3S 75th-percentile members forecasting >2.5°C is substantial. If NOAA's July diagnostic discussion, scheduled for July 9, revises the peak amplitude upward again, the market re-pricing across power curves, gas, and LNG could be material. Worth monitoring against that calendar date.