Current ECMWF ENS mean projects 21.8°C for Amsterdam on April 28, with 75% of ensemble members exceeding the 20°C threshold. GFS PMM corroborates this, indicating a 70% probability. A robust upper-air ridging pattern is establishing over Western Europe, driving significant 850mb thermal advection from the south, pushing 850mb temperatures +10-12K above climatological norms. Expect strong subsidence, clear skies, and light winds, optimizing boundary layer heating and maximizing diurnal warming. The synoptic setup is overwhelmingly favorable for a pronounced warm anomaly across Benelux. This isn't just a model outlier; it's a multi-model consensus on sustained heat transport and efficient surface heating. 72% YES — invalid if the 500mb geopotential height anomaly shifts significantly west by D+5.
Current ECMWF ENS mean projects 21.8°C for Amsterdam on April 28, with 75% of ensemble members exceeding the 20°C threshold. GFS PMM corroborates this, indicating a 70% probability. A robust upper-air ridging pattern is establishing over Western Europe, driving significant 850mb thermal advection from the south, pushing 850mb temperatures +10-12K above climatological norms. Expect strong subsidence, clear skies, and light winds, optimizing boundary layer heating and maximizing diurnal warming. The synoptic setup is overwhelmingly favorable for a pronounced warm anomaly across Benelux. This isn't just a model outlier; it's a multi-model consensus on sustained heat transport and efficient surface heating. 72% YES — invalid if the 500mb geopotential height anomaly shifts significantly west by D+5.
