Evening Weather Briefing — Friday, May 29, 2026

Evening Weather Briefing — Friday, May 29, 2026 The 12Z ECMWF run confirms a sharp two-phase pattern across NW Europe: warm pulse through Saturday, then a deep cooling into week 2 that will lift gas-for-heating demand and reduce wind generation across Continental Europe. The Pattern: Warm Spike, Then Trough Friday delivers the warmest day of the current spell. Amsterdam hits 25.5°C with 3.5 CDD, Paris reaches a scorching 27-28°C with 5-6 CDD per day through Saturday, and Frankfurt peaks at 24.5°C Saturday with 2.5 CDD. London prints 22.9°C Thursday before stepping down. This is genuine cooling demand in Paris and marginal CDD elsewhere. But the warm pulse is short-lived. Starting Sunday, a trough drives temperatures sharply lower across NW Europe. Amsterdam drops from 25.5°C Friday to 15.7°C by Wednesday — a 10-degree fall in five days. London slides from 22.9°C to 14.6°C by Wednesday, printing 0.9 HDD. Paris crashes from 27.8°C Friday to 17.6°C Wednesday. Frankfurt follows the same arc: 24.5°C Saturday to 16.4°C Wednesday. The ECMWF IFS week-2 averages tell the story cleanly: London 11.6°C (vs 16.6°C wk1), Paris 12.9°C (vs 18.8°C), Amsterdam 13.1°C (vs 15.4°C). The ensemble anomaly probabilities confirm the pattern — Paris day 5 carries a 69% warm bias (>1sd), but London day 10 has flipped to a 26% cold bias (>1sd). The warm-then-cold sequence is locked in. Wind: Moderate Now, Calming Into Next Week Friday brings decent wind across NW Europe: Amsterdam 22 km/h, London 19.6 km/h peak, Frankfurt lighter at 10 km/h. But the 12Z run shows wind weakening into the transition period. Frankfurt June 1 peak gust dropped 3.9 km/h to 10.0 km/h, Paris June 1 fell 3.6 km/h to 10.8 km/h, Amsterdam May 31 down 3.3 km/h to 14.3 km/h. The ECMWF 10-day wind averages are soft: Amsterdam 2.9 m/s, London 3.0 m/s, Frankfurt 2.0 m/s, Paris 2.6 m/s. These are not high-wind numbers. Gas burn for power generation will hold steady through the forecast period and potentially increase as the cooling arrives with lower wind. Rainfall Signal The trough brings significant precipitation to Continental Europe from Sunday onward. Frankfurt sees 11.3 mm Sunday, Amsterdam accumulates 24+ mm Tuesday-Wednesday, Paris 6-10 mm mid-week. London gets less — scattered 1-3 mm. The rainfall is consistent with an active frontal zone sweeping east. For hydro, Nordic implications are limited from this data set, but Alpine precipitation could support Swiss and Austrian reservoir levels. Ensemble Spread and Confidence The EC46 week-2 ensemble ranges are wide enough to warrant caution on the cold signal's magnitude. London week 2: 15.5°C [13.1-17.9], a 4.8°C range. Paris week 2: 17.8°C [14.6-21.4], a 6.8°C range. The ensembles have not converged on the cold extreme — the central tendency shows cooling but the tails still include near-normal outcomes. From week 3 onward, spread widens further and the signal becomes noise. Amsterdam week 3-6 ranges span 7-8°C. No tradeable signal beyond the 14-day window. US and Asia New York cools sharply this weekend: 22.3°C Thursday to 16.2°C Saturday before recovering to the mid-to-high 18s next week. US Northeast cooling demand effectively disappears for the weekend — mildly bearish for near-term NYMEX Henry Hub gas front-month. Houston's EC46 ramp continues: 25.6°C week 1 building to 29.8°C by week 6 with tight ensemble spread. US Gulf Coast summer heat is on track. Tokyo warms through week 1 at 24.1°C, Seoul 20.6°C, Shanghai 23.6°C — all building toward summer cooling demand. Bottom Line for Trading The 12Z confirms the pattern that has been building across multiple runs: warm NW Europe through Saturday, sharp cooling from Sunday into week 2, with lower wind compounding the demand signal. The combination of falling temperatures and reduced wind generation is mildly bullish for European gas burn in the day 5-14 window. ICE Endex Dutch TTF gas front-month should find support from the weather alone if the trough verifies at the ensemble mean. Watch the 00Z tonight for whether the week-2 cold signal deepens further or stabilises. The ensemble spread is still wide enough that the cold solution is not guaranteed — but the run-to-run momentum has been consistently toward cooling for three consecutive cycles.