ECMWF and GFS ensemble outputs show a strengthening subtropical ridge over Southern China by April 29, driving significant advective warming. 850mb thermal profiles project surface temperatures well into the upper 20s°C. Climatological normals for late April Guangzhou already position mean maxima around 26°C; this synoptic pattern, combined with high solar insolation, makes exceeding 26°C a near-certainty. 90% YES — invalid if significant cloud cover or unexpected cold frontal intrusion occurs.
ECMWF and GFS ensemble outputs show a strengthening subtropical ridge over Southern China by April 29, driving significant advective warming. 850mb thermal profiles project surface temperatures well into the upper 20s°C. Climatological normals for late April Guangzhou already position mean maxima around 26°C; this synoptic pattern, combined with high solar insolation, makes exceeding 26°C a near-certainty. 90% YES — invalid if significant cloud cover or unexpected cold frontal intrusion occurs.
