ECMWF ensemble mean for AMS shows persistent +2 sigma anomaly, 850hPa temps 13C+, projecting surface highs hitting 21C. Robust warm advection confirms threshold breach. 90% YES — invalid if synoptic ridge collapses pre-event.
ECMWF ensemble mean for AMS shows persistent +2 sigma anomaly, 850hPa temps 13C+, projecting surface highs hitting 21C. Robust warm advection confirms threshold breach. 90% YES — invalid if synoptic ridge collapses pre-event.