GFS and ECMWF ensemble means consistently project Tokyo's diurnal maxima for April 29 well above 15°C, with consensus around 19-21°C. Climatological normals for late April reinforce this, averaging near 20°C. No significant upper-air troughing or cold thermal advection is evident. A 15°C high would represent a severe negative anomaly requiring an extreme blocking pattern or prolonged, heavy precipitation not currently forecasted. 98% NO — invalid if a major polar vortex shift or prolonged rainy occlusion develops.
GFS and ECMWF ensemble means consistently project Tokyo's diurnal maxima for April 29 well above 15°C, with consensus around 19-21°C. Climatological normals for late April reinforce this, averaging near 20°C. No significant upper-air troughing or cold thermal advection is evident. A 15°C high would represent a severe negative anomaly requiring an extreme blocking pattern or prolonged, heavy precipitation not currently forecasted. 98% NO — invalid if a major polar vortex shift or prolonged rainy occlusion develops.
