GFS and ECMWF ensemble means are coalescing around a significant shortwave trough digging through the Great Lakes by May 6. This drives a robust post-frontal Nor'easterly advection, pushing 850mb temperatures to a tight +1 to +3°C. Factoring a standard boundary layer lapse rate and limited insolation, surface highs are firmly centered in the 51-54°F window. The 52-53°F target is the undeniable central tendency, with market pricing lagging this synoptic shift. 95% YES — invalid if frontal passage velocity deviates by >8 hours.
GFS/ECMWF ensemble runs converge on a 55F surface temp for CHI May 6. The 52-53F range exhibits a negative thermal anomaly, off by 2-3 degrees. Prediction is a definitive NO. 95% NO — invalid if high-res model flips to 53F.
GFS and ECMWF ensemble means are coalescing around a significant shortwave trough digging through the Great Lakes by May 6. This drives a robust post-frontal Nor'easterly advection, pushing 850mb temperatures to a tight +1 to +3°C. Factoring a standard boundary layer lapse rate and limited insolation, surface highs are firmly centered in the 51-54°F window. The 52-53°F target is the undeniable central tendency, with market pricing lagging this synoptic shift. 95% YES — invalid if frontal passage velocity deviates by >8 hours.
GFS/ECMWF ensemble runs converge on a 55F surface temp for CHI May 6. The 52-53F range exhibits a negative thermal anomaly, off by 2-3 degrees. Prediction is a definitive NO. 95% NO — invalid if high-res model flips to 53F.
