ECMWF ensemble median forecasts pinpoint London maxima at 19-21°C on April 29, underpinned by a dominant continental high-pressure ridge. This setup dictates robust south-easterly thermal advection and optimal boundary layer mixing under strong insolation, ensuring diurnal peaks comfortably clear 17°C. GFS and UK Met operational runs provide strong corroboration for this warming trajectory. 95% YES — invalid if an anomalous Atlantic low induces a sudden zonal flow shift.
ECMWF ensemble median forecasts pinpoint London maxima at 19-21°C on April 29, underpinned by a dominant continental high-pressure ridge. This setup dictates robust south-easterly thermal advection and optimal boundary layer mixing under strong insolation, ensuring diurnal peaks comfortably clear 17°C. GFS and UK Met operational runs provide strong corroboration for this warming trajectory. 95% YES — invalid if an anomalous Atlantic low induces a sudden zonal flow shift.
