ECMWF ensembles indicate 850hPa temps well above freezing for late April advection. Radiational cooling might graze 0°C, but -4°C demands an extreme polar outbreak highly improbable for the 28th. 95% NO — invalid if a sudden stratospheric warming forces an extreme cold snap.
ECMWF ensembles indicate 850hPa temps well above freezing for late April advection. Radiational cooling might graze 0°C, but -4°C demands an extreme polar outbreak highly improbable for the 28th. 95% NO — invalid if a sudden stratospheric warming forces an extreme cold snap.