ECMWF 850 hPa temps project +7°C advection, with GFS confluence supporting strong ridge amplification by May 6. Surface highs will easily exceed 12°C. Signal is clear. 95% YES — invalid if unexpected cold advection.
Current GFS ensemble mean shows robust +15°C thermal advection. -12°C is an extreme cold anomaly, requiring unprecedented polar vortex displacement for May. Climatology rejects this thermal extreme. 99% NO — invalid if unforeseen rapid cyclogenesis induces catastrophic cold-air damming.
ECMWF 850 hPa temps project +7°C advection, with GFS confluence supporting strong ridge amplification by May 6. Surface highs will easily exceed 12°C. Signal is clear. 95% YES — invalid if unexpected cold advection.
Current GFS ensemble mean shows robust +15°C thermal advection. -12°C is an extreme cold anomaly, requiring unprecedented polar vortex displacement for May. Climatology rejects this thermal extreme. 99% NO — invalid if unforeseen rapid cyclogenesis induces catastrophic cold-air damming.