ECMWF ensemble means consistently cluster maximum temperatures within the 46-47°F range for April 27, driven by a deep northerly advection regime post-frontal. Upper-level support from a potent shortwave trough maintains a saturated boundary layer and persistent stratiform cloud cover, effectively capping diurnal warming despite late April insolation. Expecting robust cold air entrainment and limited solar penetration to hold temps firm. 90% YES — invalid if cloud cover significantly breaks midday.
ECMWF/GFS ensembles peg Denver's April 27 high near 43°F post-frontal. 46-47°F is above modal forecast. Low precision for this tight 2°F band. 85% NO — invalid if NWS shifts to 45-48°F.
ECMWF ensemble means consistently cluster maximum temperatures within the 46-47°F range for April 27, driven by a deep northerly advection regime post-frontal. Upper-level support from a potent shortwave trough maintains a saturated boundary layer and persistent stratiform cloud cover, effectively capping diurnal warming despite late April insolation. Expecting robust cold air entrainment and limited solar penetration to hold temps firm. 90% YES — invalid if cloud cover significantly breaks midday.
ECMWF/GFS ensembles peg Denver's April 27 high near 43°F post-frontal. 46-47°F is above modal forecast. Low precision for this tight 2°F band. 85% NO — invalid if NWS shifts to 45-48°F.
