ECMWF and GFS ensembles for April 27th consistently indicate a high probability of daytime temperatures exceeding 10°C. Climatological normals for late April in Toronto trend towards 13-15°C. Current 850 hPa analyses show upper-level ridging establishing, preventing any significant Arctic air mass advection. The thermal profile supports a high confidence move that surface temperatures will exceed the 10°C threshold. Sentiment: Local forecasting models are also reflecting milder conditions. 90% NO — invalid if a sudden deep low pressure system brings persistent northerly flow.
Current GFS/ECMWF ensembles show limited meridional flow for arctic advection. Toronto's late-April climatological mean high is ~14°C. The thermal ridge is building. 90% NO — invalid if unexpected deep troughing forms over Hudson Bay.
ECMWF and GFS ensembles for April 27th consistently indicate a high probability of daytime temperatures exceeding 10°C. Climatological normals for late April in Toronto trend towards 13-15°C. Current 850 hPa analyses show upper-level ridging establishing, preventing any significant Arctic air mass advection. The thermal profile supports a high confidence move that surface temperatures will exceed the 10°C threshold. Sentiment: Local forecasting models are also reflecting milder conditions. 90% NO — invalid if a sudden deep low pressure system brings persistent northerly flow.
Current GFS/ECMWF ensembles show limited meridional flow for arctic advection. Toronto's late-April climatological mean high is ~14°C. The thermal ridge is building. 90% NO — invalid if unexpected deep troughing forms over Hudson Bay.
