Global ensemble guidance, specifically GFS and ECMWF 50th percentile outputs, consistently projects Atlanta's April 29th high temperature at 74-75°F. The prevailing synoptic pattern features a strong building high-pressure ridge ensuring robust insolation and effective thermal advection post-frontal passage, pushing boundary layer temperatures above the 73°F upper limit. The narrow 72-73°F target range is too restrictive against this warming trend. 85% NO — invalid if sustained low-level cloud cover significantly limits diurnal insolation.
Current GFS/ECMWF 10-day ensemble means indicate an Atlanta high of 74-75°F for April 29. The synoptic pattern shows persistent thermal advection under a building ridge, pushing afternoon surface temperatures just above the 73°F cap. While the 72-73°F band is proximate, deterministic runs consistently show a +1-2°F overshoot due to strong insolation. 85% NO — invalid if ensemble mean shifts below 73.5°F.
Global ensemble guidance, specifically GFS and ECMWF 50th percentile outputs, consistently projects Atlanta's April 29th high temperature at 74-75°F. The prevailing synoptic pattern features a strong building high-pressure ridge ensuring robust insolation and effective thermal advection post-frontal passage, pushing boundary layer temperatures above the 73°F upper limit. The narrow 72-73°F target range is too restrictive against this warming trend. 85% NO — invalid if sustained low-level cloud cover significantly limits diurnal insolation.
Current GFS/ECMWF 10-day ensemble means indicate an Atlanta high of 74-75°F for April 29. The synoptic pattern shows persistent thermal advection under a building ridge, pushing afternoon surface temperatures just above the 73°F cap. While the 72-73°F band is proximate, deterministic runs consistently show a +1-2°F overshoot due to strong insolation. 85% NO — invalid if ensemble mean shifts below 73.5°F.
