No. High conviction on Seoul's May 6th maximum temperature well exceeding 11°C. Current 06Z GFS and 00Z ECMWF operational runs consistently project surface highs in the 16-19°C range, underpinned by 850mb temperature profiles hovering +2 to +5°C. This thermal advection pattern is fundamentally incompatible with a sub-11°C surface high, especially considering typical early May insolation and lack of widespread, persistent precipitation. Ensemble analysis from both GEFS and EPS shows overwhelming membership, with over 85% of members forecasting highs above the 11°C threshold, the ensemble mean centering around 17°C. There is no resolved synoptic pattern—neither a deep polar trough nor a sustained Siberian high influence—that would drive the extreme negative temperature anomaly required for a high of 11°C or below. Climatological mean for May 6th is approximately 20°C. 95% NO — invalid if 12Z ECMWF run shifts 850mb temperatures below -2°C over the Korean Peninsula, coupled with significant northerly geopotential height anomaly advection.
No. High conviction on Seoul's May 6th maximum temperature well exceeding 11°C. Current 06Z GFS and 00Z ECMWF operational runs consistently project surface highs in the 16-19°C range, underpinned by 850mb temperature profiles hovering +2 to +5°C. This thermal advection pattern is fundamentally incompatible with a sub-11°C surface high, especially considering typical early May insolation and lack of widespread, persistent precipitation. Ensemble analysis from both GEFS and EPS shows overwhelming membership, with over 85% of members forecasting highs above the 11°C threshold, the ensemble mean centering around 17°C. There is no resolved synoptic pattern—neither a deep polar trough nor a sustained Siberian high influence—that would drive the extreme negative temperature anomaly required for a high of 11°C or below. Climatological mean for May 6th is approximately 20°C. 95% NO — invalid if 12Z ECMWF run shifts 850mb temperatures below -2°C over the Korean Peninsula, coupled with significant northerly geopotential height anomaly advection.
